WO2003047000A1 - Semiconductor device and production method therefor - Google Patents
Semiconductor device and production method therefor Download PDFInfo
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- WO2003047000A1 WO2003047000A1 PCT/JP2002/012396 JP0212396W WO03047000A1 WO 2003047000 A1 WO2003047000 A1 WO 2003047000A1 JP 0212396 W JP0212396 W JP 0212396W WO 03047000 A1 WO03047000 A1 WO 03047000A1
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- H10D64/01302—Manufacture or treatment of electrodes having a conductor capacitively coupled to a semiconductor by an insulator the insulator being formed after the semiconductor body, the semiconductor being silicon
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- H10D64/01336—Making the insulator on single crystalline silicon, e.g. chemical oxidation using a liquid
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- H10D12/032—Manufacture or treatment of IGBTs of vertical IGBTs
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- H10D30/028—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs
- H10D30/0291—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs of vertical DMOS [VDMOS] FETs
- H10D30/0295—Manufacture or treatment of FETs having insulated gates [IGFET] of double-diffused metal oxide semiconductor [DMOS] FETs of vertical DMOS [VDMOS] FETs using recessing of the source electrodes
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- H10D62/83—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge
- H10D62/832—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group IV materials, e.g. B-doped Si or undoped Ge being Group IV materials comprising two or more elements, e.g. SiGe
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- H10D64/01332—Making the insulator
- H10D64/01336—Making the insulator on single crystalline silicon, e.g. chemical oxidation using a liquid
- H10D64/01344—Making the insulator on single crystalline silicon, e.g. chemical oxidation using a liquid in a nitrogen-containing ambient, e.g. N2O oxidation
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- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
- H10D64/681—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having a compositional variation, e.g. multilayered
- H10D64/685—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having a compositional variation, e.g. multilayered being perpendicular to the channel plane
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- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
- H10D64/693—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator the insulator comprising nitrogen, e.g. nitrides, oxynitrides or nitrogen-doped materials
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- H10D30/637—Lateral IGFETs having no inversion channels, e.g. buried channel lateral IGFETs, normally-on lateral IGFETs or depletion-mode lateral IGFETs
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- H10D64/23—Electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. sources, drains, anodes or cathodes
- H10D64/251—Source or drain electrodes for field-effect devices
- H10D64/252—Source or drain electrodes for field-effect devices for vertical or pseudo-vertical devices
- H10D64/2527—Source or drain electrodes for field-effect devices for vertical or pseudo-vertical devices for vertical devices wherein the source or drain electrodes are recessed in semiconductor bodies
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- H10D64/251—Source or drain electrodes for field-effect devices
- H10D64/256—Source or drain electrodes for field-effect devices for lateral devices wherein the source or drain electrodes are recessed in semiconductor bodies
Definitions
- the present invention relates to a semiconductor device having a SiC layer and a method of manufacturing the same, and more particularly, to an insulated gate type semiconductor device and a method of manufacturing the same.
- Silicon carbide has higher dielectric breakdown characteristics than other semiconductor materials having a large band gap. Therefore, application to low-loss power devices is expected in recent years.
- a silicon carbide semiconductor device for high power driving is considered to be effective in the form of an insulated gate semiconductor device.
- a MISFET using silicon carbide is a low-loss power semiconductor.
- a transition layer containing carbon is formed in the interface region between the gate insulating film and the SiC substrate, and there is a correlation between the transition layer and the interface state trap density.
- the thickness of the transition layer must be 1 nm or less in order to reduce the interface state trap density to 1 ⁇ 10 12 [cm— 2 eV— ⁇ or less.
- a silicon carbide substrate is exposed to an oxidizing gas atmosphere at a temperature of 100 ° C. to 140 ° C. to form a thermal oxide film for a gate insulating film on silicon carbide.
- the behavior of carbon which stoichiometrically accounts for about half of the constituent elements of silicon carbide, greatly affects the formation of the interface between silicon carbide and the thermal oxide film. Affects the electrical properties of the device.
- This interface state trap has a significant effect on electron transport and significantly reduces the device's channel-conductance.
- a semiconductor device includes: a SiC substrate having a source region and a drain region; a gate insulating film formed on a part of the SiC substrate; and a gate formed on the gate insulating film.
- An electrode is provided, and a transition layer having a thickness of 1 nm or less is formed in an interface region between the SiC substrate and the gate insulating film.
- the channel resistance can be reduced, and the performance of the SiC power device can be sufficiently obtained.
- the gate insulating film has at least a first insulating film formed by oxidizing a part of the SiC substrate, and a second insulating film deposited above the first insulating film.
- the thickness of the first insulating film is smaller than the thickness of the conventional thermal oxide film, so that the matching of the interface between the SiC substrate and the first insulating film is improved, and the interface state It is possible to suppress the occurrence of traps.
- the second insulating film since the second insulating film is formed, a gate insulating film having a necessary thickness as a gate insulating film of a low-loss power semiconductor device can be obtained.
- the thickness of the first insulating film is 0.5 nm or more and 20 nm or less, the thickness of the first insulating film is thinner than a conventional thermal oxide film.
- the interface between the first insulating film and the first insulating film can be easily controlled.
- the first insulating film is formed by thermally oxidizing a part of the SiC substrate. As a result, a high-quality oxide film can be obtained as the first insulating film.
- the first insulating film contains nitrogen in a content ratio of 10.0% or less, generation of defects in the first insulating film can be suppressed.
- the thickness of the second insulating film is preferably 5 nm or more and 200 nm or less.
- the second insulating film is made of any one of oxide, nitride, and oxynitride. Is preferred.
- the first cap layer is provided between the first insulating film and the second insulating film, even if heat treatment is performed at the time of manufacturing a semiconductor device, oxygen and the like can be formed in the first insulating film. And diffusion to the SiC substrate can be prevented.
- the thickness of the first cap layer is not less than 0.5 nm and not more than 10 nm, so that the first cap layer can function as a cap and is too thick. This can suppress the influence of a large and easy defect.
- the first cap layer is made of an oxynitride film having a value of NZ (N + O) of 0.1 or more and 0.5 or less, generation of stress in the gate insulating film can be suppressed. .
- a second cap layer made of a nitride film or an oxynitride film having a thickness of 0.5 n or more and 10 nm or less between the second insulating film and the gate electrode.
- the impurities are metals when a metal electrode is formed, and boron (B) and phosphorus (P) when a polysilicon electrode is formed.
- the gate insulating film is subjected to pre-annealing in a hydrogen-containing atmosphere after dry-oxidizing a part of the SiC substrate, and then annealing in an atmosphere having oxygen-containing molecules and nitrogen-containing molecules. As a result, a gate insulating film having a low hydrogen concentration and a high density can be obtained, so that a highly reliable semiconductor device having high insulation resistance can be obtained.
- the gate insulating film is subjected to pre-annealing in an atmosphere containing halogen after dry oxidation of a part of the SiC substrate, and is then annealed in an atmosphere having molecules containing oxygen and molecules containing nitrogen. Hydrogen formed by Since a gate insulating film with low concentration and high density can be obtained, a highly reliable semiconductor device with high insulation resistance can be obtained.
- the semiconductor device may be an inversion-type enhancement transistor.
- the semiconductor device may be a storage enhancement transistor.
- the first insulating film having a smaller thickness than before is formed with good controllability of the interface between the SiC substrate and the first insulating film
- the second insulating film can be formed in a thickness required for the gate insulating film, so that the interface generated at the interface between the SiC substrate and the gate insulating film can be formed.
- a semiconductor device having few levels, low segregation of C and the like, and having a sufficient film thickness can be formed.
- the first insulating film it is preferable to form the first insulating film by thermally oxidizing a part of the SiC substrate at a temperature of 800 ° C. or more and 1400 ° C. or less.
- a portion of the semiconductor layer is oxidized in an atmosphere having an oxygen partial pressure of 1.4 ⁇ 10 2 Pa or less to form the first insulating film, and Even below, the first insulating film can be formed with good controllability.
- a part of the semiconductor layer is oxidized in an atmosphere containing oxygen and nitrous oxide, or in an atmosphere containing oxygen and nitric oxide to form the first insulating film.
- the oxygen partial pressure is preferably at most atmospheric pressure, and the nitrous oxide partial pressure or nitric oxide partial pressure is preferably 10% or less of the oxygen partial pressure.
- the SiC substrate is introduced into a CVD apparatus and contains at least one of oxygen, nitrous oxide and nitric oxide, and has a partial pressure of 1.4 ⁇ 10 2 P a
- a partial pressure of 1.4 ⁇ 10 2 P a By oxidizing the above SiC substrate in an atmosphere containing the following silane to form the first insulating film, introducing silane to supply Si to the SiC substrate. Since the upper part of the SiC substrate can be oxidized while doing so, a high-quality thermal oxide film can be formed without oxidizing the upper part of the SiC substrate during oxidation.
- step (a) in a nitric oxide atmosphere with a partial pressure of 1.4 X 10 Pa or more and an atmospheric pressure or less and an atmospheric pressure of 600 ° C or more and 1400 ° C or less, annealing for 1 hour or more May be performed.
- the method further comprises a step (e) of forming a first cap layer on the first insulating film, and in the step (b), By forming the second insulating film, even if heat treatment is performed after the step (b), diffusion of oxygen and the like toward the first insulating film and the like can be prevented.
- the first cap layer is preferably formed by a CVD method in an atmosphere of a first supply gas containing silane and an ammonia-based gas.
- the first cap layer may be formed in an atmosphere further containing nitrous oxide having a flow ratio of 10% or less of the first supply gas.
- the CVD method is used to carry out the second step in an atmosphere containing silane and nitrous oxide at a temperature not higher than the above-mentioned annealing temperature within a range of 600 ° C. to 1,000 ° C. May be formed.
- annealing may be performed in an atmosphere containing nitric oxide at a temperature not higher than the temperature for forming the second insulating film in the range of 600 ° C. or higher and 10000 ° C. or lower. Good.
- a step (f) of forming a second cap layer on the second insulating film is further provided.
- the quality of the interface of the insulating film can be prevented from being deteriorated when the electrode is formed. As a result, the reliability of the gate insulating film can be improved.
- the temperature is set to a value not higher than the temperature for forming the second insulating film. Maintained at 00 ° C over 1 000 ° C or less in the range in an atmosphere of a partial pressure 1.
- second feed gas containing the 4 X 1 0 2 P a following silane and ammonia-based gas, more CVD method
- the second cap layer may be formed.
- the second cap layer may be formed in an atmosphere further containing nitrogen oxynitride having a flow ratio of 10% or less of the second supply gas.
- the thickness is 0.5 nm
- the minimum transition distance from the non-conductive region to the conductive region at the interface is 0.5 nm. Therefore, the lower limit of the thickness of the first insulating film for the purpose of forming a high-quality interface with good control is 0.5 nm, but this is of course not required if the interface is not discontinuous but has a width.
- an insulating film having a low hydrogen concentration and a high density can be obtained in the step (a), and the transition layer formed between the insulating film and the SiC substrate by the oxygen in the step (b). Can be oxidized, so that the thickness of the transition layer can be reduced.
- a high-quality gate insulating film can be obtained by forming the insulating film in an atmosphere containing at least one of oxygen, nitrous oxide, and nitric oxide. it can.
- the insulating film is preferably formed at a temperature of at least 1,000 ° C. and at most 1,400 ° C.
- step (b) by irradiating UV light to an atmosphere containing ozone and performing the annealing, oxygen radicals are generated, and the transition layer can be efficiently oxidized.
- step (b) by performing the annealing in an atmosphere having molecules containing nitrogen, defects contained in an insulating film or the like can be filled with nitrogen, and the thickness of the transition layer can be further reduced. Can be.
- the annealing may be performed in an atmosphere containing ammonia or nitric oxide.
- a step (e) of performing a pre-anneal on the insulating film is further provided, so that carbon remaining in the transition layer and its vicinity is discharged. be able to.
- the pre-annealing may be performed at a temperature of 700 ° C. or more and 1000 ° C. or less in an atmosphere containing hydrogen.
- the pre-annealing may be performed at a temperature of 900 ° C. or more and 1200 ° C. or less in an atmosphere containing halogen.
- the above-mentioned pre-annealing is performed in a gas atmosphere containing dichlorosilane at a temperature of 1 000 ° C or less and a pressure of 13.3 Pa or less. Can emit carbon.
- FIG. 1 is a cross-sectional view illustrating a structure of a portion near a gate insulating film in the semiconductor device according to the first embodiment.
- FIG. 2 is a cross-sectional view illustrating the structure of the semiconductor device according to the first embodiment.
- FIG. 3 is a table showing conditions of a step of forming a gate insulating film of the semiconductor device according to the first embodiment.
- FIG. 4 is a cross-sectional view illustrating a structure of a portion near a gate insulating film in the semiconductor device according to the second embodiment.
- FIG. 5 is a cross-sectional view illustrating the structure of the semiconductor device according to the second embodiment.
- FIG. 6 is a graph showing the result of S I MS analysis of a sample in which a silicon dioxide film was formed by thermally oxidizing the upper part of S i C.
- FIG. 7 is a graph showing the correlation between the transition layer thickness and the total number of interface traps.
- FIG. 8 is a cross-sectional view illustrating the structure of the semiconductor device according to the third embodiment.
- FIG. 9 is a cross-sectional view illustrating a structure of a semiconductor device according to the fourth embodiment.
- FIG. 10 is a cross-sectional view showing a structure near a gate insulating film in the semiconductor device according to the fifth embodiment.
- FIG. 11 is a time chart showing conditions of a step of forming a gate insulating film of a semiconductor device and performing annealing in the fifth embodiment.
- a first insulating film obtained by thermal oxidation of SiC and a second insulating film obtained by depositing by a CVD method or the like are used as gate insulating films of MISFETs and the like. Will be described.
- Oxide annealing technology (hereinafter referred to as POA treatment) that exposes the substrate in an oxygen atmosphere at a low temperature may be used.
- POA treatment Oxide annealing technology
- the thickness of the thermal oxide film formed on silicon carbide is 20 nm or more, it is difficult to perform sufficient POA treatment.
- another method of forming an oxide film on silicon carbide is to use an oxide film deposited by a CVD method as a gate insulating film.
- the change in the composition of the interface between the oxide film and silicon carbide is sharp.
- the deposited oxide film can be formed in a short time.
- the rate of thermal oxide film formation on silicon carbide is 110
- the VD method is an industrially necessary technology in terms of productivity.
- the inventors have devised a method in which a CVD oxide film is further deposited on a thermal oxide film formed by thermally oxidizing an upper portion of silicon carbide to form a gate insulating film.
- FIG. 1 is a cross-sectional view showing a structure near a gate insulating film in the semiconductor device according to the first embodiment.
- the first insulating film of a 5 nm thick thermal oxide film is formed on the p-type SiC layer 1.
- a film 2 a first cap layer 3 which is a 5-nm-thick oxynitride film, a second insulating film 4 which is a 130-nm-thick deposited oxide film, and a 5-nm-thick oxynitride
- a gate insulating film 6 including a second cap layer 5 as a film is formed, and a gate electrode 7 is formed thereon.
- a transition layer 8 having a thickness of 1 nm or less is interposed between the SiC layer 1 and the first insulating film 2.
- the gate insulating film 6 includes a first insulating film obtained by thermal oxidation of SiC and a second insulating film obtained by depositing by a CVD method or the like.
- first insulating film 2 Since the first insulating film 2 is in contact with the SiC layer 1, it greatly affects the electrical characteristics of the device.
- the first insulating film 2 is a thermal oxide film obtained by thermally oxidizing an upper portion of the SiC layer 1, thereby forming a deposited oxide film on the SiC layer 1 by a CVD method or the like.
- the SiC-insulating film interface As compared with the case of performing the above, it is easier to maintain the quality of the interface between the SiC layer 1 and the first insulating film 2 (hereinafter referred to as the SiC-insulating film interface). You. Further, the first insulating film 2 preferably has a thickness of 0.5 to 20 nm, and since the thickness of the first insulating film 2 is smaller than that of the conventional insulating film, control of the interface between the SiC and the insulating film is performed. Becomes easier.
- FIG. 6 is a graph showing the results of SIMS analysis of a sample in which a silicon dioxide film was formed by thermally oxidizing the upper part of SiC.
- a transition layer refers to a region where the composition ratio of carbon changes at the interface between a SiC layer and an oxide film (including a film containing oxygen such as an oxynitride film). .
- the region between the point B taken up in 13 C intensity is a transition layer 8.
- FIG. 7 is a graph showing the correlation between the transition layer thickness and the total number of interface traps.
- data with a transition layer thickness of 3 nm or more was created by a conventional method.
- the number of interface traps was calculated by forming a MOS diode using the same oxide film as in the measurement of FIG. 6 and performing CV analysis. Further, the thermal oxide film was formed on the 4H—SiC (00001) plane.
- the thickness of the transition layer 8 at the interface between the SiC and the thermal oxide film was 1 nm or less, and the total number of traps was 7 ⁇ 10 11 cm ⁇ 2 .
- the value of the channel mobility at this time is 60 cm 2 (V-s).
- an oxide film was formed on the 4H—SiC (00001) plane.
- a good SiC—oxide film interface can be formed on other crystal planes.
- An oxide film can be formed.
- the thickness of the transition layer 8 formed on the SiC substrate 1 can be kept small, so that the number of traps can be reduced.
- the thermal insulating film containing a small amount (for example, a content of about 0.1% or less) of N is used as the first insulating film 2 instead of the thermal oxide film, the number of traps can be further reduced. be able to.
- the band in the transition layer 8 changes continuously even if the change in the composition ratio is sufficiently ⁇ ⁇ discontinuous.
- the thickness of the transition layer 8 is about 0.5 nm. That is, at the interface between the SiC and the insulating film, the transition distance from the non-conductive region to the conductive region can be said to be about 0.5 nm or more.
- the first cap layer 3 has a role of preventing oxygen from diffusing into the first insulating film 2 and the SiC layer 1 in a later heat treatment step.
- the first cap layer 3 is an oxynitride film having an N content of about 10 to 50%, the generation of stress in the oxynitride film is suppressed, so that the defect density is reduced.
- the thickness of the first cap layer 3 is preferably 0.5 to 10 nm. As a result, the function as a cap is exhibited, and the influence of defects due to an excessively large film thickness can be suppressed.
- the second insulating film 4 is formed by a CVD method in order to make the thickness of the insulating film about 150 nm or more.
- the second insulating film 4 suppresses the generation of a leak current, and can ensure the reliability of the device.
- the second insulating film 4 preferably has a thickness in the range of 50 to 200 nm.
- the second insulating film 4 may be formed of an oxynitride film, a nitride film, or a high dielectric material in addition to the oxide film.
- the second insulating film 4 is made of a high dielectric material, the leakage current is suppressed. Furthermore, the value of the transconductance is improved because the insulating film capacitance is increased while maintaining high reliability.
- the second cap layer 5 is preferably a nitride film having a thickness of 0.5 to 10 nm.
- the impurities are metals when the gate electrode material is metal, and boron (B) and phosphorus (P) when the gate electrode material is polysilicon.
- FIG. 2 is a cross-sectional view illustrating the structure of the semiconductor device according to the first embodiment.
- the semiconductor device of the present embodiment includes a SiC substrate 10, a p-type SiC layer 1 formed on the SiC substrate 10, and a SiC layer.
- a gate insulating film 6 formed on the gate insulating film 6 via a transition layer 8; a gate electrode 7 formed on the gate insulating film 6; a gate insulating film 6 and a gate electrode
- the source region 12 and the drain region 13 provided in the region on the side of 7 and the source electrode 14 and the drain electrode 15 provided on the source region 12 and the drain region 13 respectively.
- the SiC substrate 10 may be either a p-type semiconductor or an n-type semiconductor.
- an insulating substrate may be used instead of the SiC substrate 10.
- FIG. 3 is a table showing conditions of a step of forming a gate insulating film of the semiconductor device according to the first embodiment.
- step ST1 the temperature of the SiC layer 1 is increased to 130 ° C. under a reduced pressure atmosphere while introducing silane. At this time, since the sublimation rate of SiC is relatively low under a reduced-pressure atmosphere, the temperature may be increased without introducing silane.
- step ST 2 on 3 1 ⁇ layer 1, 1. 4 X 1 0 by supplying 2 P a less oxygen, the first insulating film is a thermal oxide film having a thickness of about 5 nm Form 2.
- the partial pressure of oxygen to 1. 4 X 1 0 2 P a less even at a high temperature of 1 3 0 0 ° about C, and formed with good controllability of the first insulating film thickness be able to.
- the first insulating film 2 is formed by the MBE method, the control of the interface becomes easy, and the control of several atomic layers becomes easy.
- the first insulating film having a nitrogen content of 10% or less is formed by including nitrous oxide at a partial pressure of about 10% or less of the oxygen partial pressure in the atmosphere. be able to.
- the thermal oxide film generation of defects in the oxide film can be prevented.
- the SiC substrate 1 is exposed to an atmosphere containing an oxidizing gas and a pulse-controlled silane having a partial pressure of 1.4 X 10 Pa or less.
- the first insulating film 2 having a steep interface between the SiC substrate 1 and the first insulating film 2 can be formed.
- Si can be supplied onto the SiC substrate.
- a high-quality thermal oxide film can be formed without oxidizing.
- the UV ozone cleaning treatment may be performed at a temperature of 0 ° C.
- step ST 3 on the substrate, 3. 9 X 1 0 4 in P a CO atmosphere or an oxygen atmosphere, by performing Aniru of 1 3 00 ° C, the quality of the interface portion Can be improved.
- annealing can be performed at a temperature of 600 to 1400 ° C. by supplying carbon monoxide or oxygen at atmospheric pressure or less for 3 hours or less, thereby suppressing generation of defects.
- Step ST4 the substrate is introduced into the CVD apparatus, and 66.5 Pa of silane / ammonia is supplied onto the first insulating film 2 at 900 ° C. for 10 minutes.
- the temperature is set in the range of 600 to 1 000 ° C and lower than the first insulating film forming temperature shown in step ST2, and the partial pressure of silane is set to 1.4 X set below 1 0 2 P a. Thereby, the number of defects generated in the insulating film can be minimized. At this time, the temperature in the apparatus is not returned to room temperature in order to prevent the occurrence of defects.
- oxynitridation with a nitrogen content ratio of 10 to 30% is performed.
- a film can be formed.
- step ST5 6.65 ⁇ 10 Pa dichlorosilane and nitrous oxide are supplied onto the first cap layer 3 by the CVD method at 800 ° C. for 30 minutes.
- a second insulating film 4 which is a deposited oxide film having a thickness of about 130 nm is formed.
- S i 0 2, S i 3 N 4, S r T i Oa, AIY z OL a T a OT i Os, H f Z r 0 2 and combination Or may be used by incorporating other materials.
- step ST6 a heat treatment is performed at a temperature of 800 ° G for 1 hour in a nitrogen monoxide atmosphere of 3.4 ⁇ 10 4 Pa.
- step ST7 1.4 x 10 Pa of silane-ammonia is supplied on the second insulating film 4 at 800 ° C for 10 minutes to form a thick film.
- step ST8 the substrate is cooled to room temperature to form a gate insulating film 6 including the first insulating film 2, the first cap layer 3, the second insulating film 4, and the second cap layer 5. Can be obtained.
- the gate insulating film 6 has a thickness of 0.5 r> rr!
- the first insulating film 2 obtained by thermal oxidation of the SiC layer 1 having a thickness of 5 to 20 nm, and the second insulating film 2 having a thickness of 5 nm to 200 nm deposited by a CVD method or the like. Since the thickness of the first insulating film 2 is smaller than the thickness of the conventional thermal oxide film, the thickness of the first insulating film 2 is smaller than that of the conventional thermal oxide film. The control of the interface between the two becomes easy.
- the thickness of the transition layer at the interface between the SiC layer 1 and the first insulating film 2 can be reduced to 1 nm or less, and the occurrence of interface state traps can be suppressed.
- carbon remaining in the first insulating film 2 or near the interface between the SiC layer 1 and the first insulating film 2 is cleaned by POA processing such as annealing shown in step ST4. And it becomes easy to obtain the consistency of the interface.
- the second insulating film 4 allows the gate insulating film 6 as a whole to have a thickness of about 150 nm or more, which is required for the gate insulating film of the low-loss power semiconductor device. .
- the gate insulating film considered in the first embodiment is applied to a storage-type enhancement gate type insulated gate semiconductor device.
- FIG. 4 is a cross-sectional view illustrating a structure of a portion near a gate insulating film in the semiconductor device according to the second embodiment.
- an n-type channel region 28 is formed on the p-type SiC layer 21, and a thickness of 5 nm is formed thereon.
- the first insulating film 22 is a thermal oxide film of about 1 mm
- the first cap layer 23 is an oxynitride film of about 5 r> m thick
- the deposited oxide film is about 1300 nm in thickness.
- FIG. 5 is a cross-sectional view illustrating the structure of the semiconductor device according to the second embodiment.
- the semiconductor device of this embodiment includes an n-type SiC substrate 20, a p-type SiC layer 21 formed on the SiC substrate 20, an n-type channel region 28 formed on the iC layer 21; a gate insulating film 26 formed on the channel region 28 with a transition layer 29 interposed; A gate electrode 27 formed on the gate insulating film 26, and a gate electrode 27 on the side of the gate insulating film 26 and the gate electrode 27 in the SiC substrate 20.
- the method of manufacturing the semiconductor device of the present embodiment is the same as that of the first embodiment except that an ⁇ -type channel region 28 is formed on the p-type SiC layer 21.
- the effect obtained by forming the gate insulating film is also the same as that of the first embodiment.
- the gate insulating film considered in the first embodiment is applied to an insulated gate semiconductor device having an S-doped layer.
- FIG. 8 is a cross-sectional view illustrating the structure of the semiconductor device according to the third embodiment.
- the semiconductor device includes an n-type SiC substrate 40, a p-type SiC layer 41 formed on the SiC substrate 40, (5) A channel region 46 having a doped layer, a gate insulating film 47 formed on the channel region 46, and a gate insulating film 4 7 and a source region 42 and a drain region 4 provided in the SiC layer 41 on the side of the gate insulating film 47 and the gate electrode 48. 3 and a source electrode 44 and a drain electrode 45 provided on the source region 42 and the drain region 43, respectively.
- the method of manufacturing the semiconductor device according to the present embodiment is the same as that of the first embodiment except that a channel region 46 having a ⁇ -doped layer is formed on the p-type SiC layer 41. Further, in the present embodiment, the effect obtained by forming the gate insulating film is the same as that of the first embodiment.
- a feature of the present embodiment is that the gate insulating film described in the first embodiment is used as a vertical MISFF gate insulating film. Since the structure of the gate insulating film is the same as that of the first embodiment, the description is omitted.
- FIG. 9 is a cross-sectional view illustrating the structure of a vertical storage-type enhancement-type MISF device according to the fourth embodiment.
- an ISiC layer 51 is formed on a SiC substrate 50.
- a P- type region 52 containing an impurity of the second conductivity type ( P type) is provided in a part of the upper portion of the first SiC layer 51.
- the region surrounding the p-type region 52 is provided with a drift region 53 containing a first conductivity type (n-type) impurity.
- the second SiC layer having a contact hole (groove) 55 is provided on two P-well regions 52 separated from each other from above the drift region 53. layer 5 4 are provided.
- the storage channel layer 56 containing the impurity of the first conductivity type is provided in a portion of the second SiC layer 54 except for both ends. Then, the contact including the impurity of the first conductivity type extends from both ends of the second SiC layer 54 to a portion of the first SiC layer 51 below the both ends.
- An area 57 is provided.
- a first ohmic electrode (source electrode) 58 is provided from above the contact region 57 to above the p-well region 52 exposed on the lower surface of the contact hole 55.
- Gate insulation is provided from above the storage channel layer 56 of the second SiC layer 54 to above the portion of the contact region 57 which is located at the boundary with the storage channel layer 56.
- a membrane 59 is provided.
- This gate insulating film 59 has a structure similar to that of the first embodiment.
- a gate electrode 60 is provided on the gate insulating film 59.
- An electrode (drain electrode) 61 is provided on a surface (lower surface) facing the main surface of the SiC substrate 50.
- the semiconductor device according to the present embodiment can be formed by a known manufacturing method except for the step of forming the gate insulating film 59.
- the method of forming the gate insulating film 59 is the same as in the first embodiment.
- the effect obtained by forming the gate insulating film 59 is also the same as that of the first embodiment.
- a storage-type enhancement-type transistor is described as an example of the vertical MISFET, but the present invention can also be applied to an inversion-type enhancement-type transistor.
- an oxide film formed by dry-oxidizing the upper portion of the SiC layer and then annealing under predetermined conditions is used as a gate insulating film such as MISFET.
- the thermal oxide film is formed by wet oxidation of the SiC layer, the SiC layer is exposed to an oxygen atmosphere containing high-concentration water vapor. ⁇
- the surface level trap density can be reduced to 5 X 1 0 1 1 cm one 2 e V- 1 below.
- the withstand voltage is low because the concentration of hydrogen contained in the film is high and the density is low. Therefore, thermal oxide film by wet oxidation is considered to lack reliability.
- thermal oxide films formed by wet oxidation cannot effectively reduce the interface state density generated near the conduction band in the band gap. Therefore, when a semiconductor device is formed using a thermal oxide film formed by wet oxidation, it is difficult to dramatically improve the mobility.
- the thermal oxide film is formed by dry oxidation of the SiC layer
- the SiC layer is exposed to an oxygen atmosphere in which no steam is introduced and the partial pressure of steam is 20% or less of the total pressure. I do. More preferably, the SiC layer is exposed to a water vapor pressure of 10% or less of the total pressure.
- the concentration of hydrogen is low and the density is high. Therefore, the thermal oxide film formed by dry oxidation has a better film quality than the thermal oxide film formed by wet oxidation.
- the interface state density generated near the conductor in the band gap by reoxidizing the thermal oxide film formed by dry oxidation at a temperature lower than the dry oxidation temperature. Can be lowered. Even with this method, it is difficult to sufficiently lower the interface state density so that the thickness of the transition layer becomes 1 nm or less.
- an oxide film formed by dry oxidation has properties of high density and low defect density, and can be said to be suitable for a gate insulating film.
- the present inventors have proposed a method of reducing the thickness of the transition layer by dry-oxidizing the upper part of the SiC layer to form a high-quality oxide film and then performing thermal oxidation under predetermined conditions. I figured out.
- the following is the structure of the gate insulating film created by the above considerations and its gate insulation. An example in which an insulating gate type semiconductor device is applied to an edge film will be described.
- FIG. 10 is a cross-sectional view showing a structure near a gate insulating film in the semiconductor device according to the fifth embodiment.
- a thermal oxide film 73 is formed on a SiC substrate 71 with a transition layer 72 interposed therebetween.
- FIG. 11 is a time chart showing conditions of a step of forming a gate insulating film of a semiconductor device and performing annealing in the fifth embodiment.
- the SiC substrate 71 (shown in FIG. 10) is placed on a 4H—SiC (00001) 500 ° C with the Si surface as the main surface side.
- the temperature of the S ⁇ C substrate 71 is raised to 130 ° C., and thermal oxidation (dry oxidation) is performed for 2 hours.
- a 40 nm-thick thermal oxide film 73 functioning as a gate insulating film is formed on the 4H—SiC (00001) Si surface of the SiC substrate 1.
- a 1-hour pre-anneal is performed in a hydrogen atmosphere at a temperature of 1000 ° C. By performing the pre-annealing, carbon remaining in the transition layer 72 and its vicinity can be discharged. Subsequently, the temperature is lowered to 900 ° C. while maintaining the hydrogen atmosphere.
- annealing is performed at 900 ° C. by exposure to an atmosphere containing oxygen-containing molecules for 3 hours.
- the transition layer 72 can be oxidized and carbon can be discharged.
- active oxygen refers to highly reactive molecules containing oxygen such as oxygen radicals and nitric oxide. Oxygen radicals can be generated by introducing oxygen-containing molecules such as ozone under UV light irradiation or into plasma.
- the thickness of the transition layer 72 can be further reduced by supplying molecules containing nitrogen in addition to molecules containing oxygen.
- the active nitrogen refers to a highly reactive molecule containing nitrogen such as nitrogen radical or nitrogen monoxide.
- the nitrogen radical is a nitrogen molecule It can be produced by introducing nitrogen-containing molecules, such as nitrogen and ammonia, into UV light irradiation, plasma or the like. This active nitrogen has a nitrogen passivation effect.
- a transition layer 72 having a thickness of 1 nm or less is formed between the SiC substrate 71 and the thermal oxide film 73, as shown in FIG. can do. Since the thickness of the transition layer 72 is smaller than that of the related art, it can be said that the interface between the SiC substrate 71 and the thermal oxide film 73 is steeper.
- the thermal oxide film as described above is a semiconductor device of an inversion type enhancement type as shown in FIG. 2, a semiconductor device of an accumulation type enhancement type as shown in FIG. 5, and a (5 doped type) as shown in FIG. It can be used as a gate insulating film of a semiconductor device using a layer and a vertical semiconductor device as shown in Fig. 9.
- the structure excluding the gate insulating film is the first type. Since the structure is the same as that described in the fourth to fourth embodiments, the description is omitted.
- the thermal oxide film of the present embodiment is formed on the 4H-SiC (001) Si surface to form a gate insulating film of an inversion-type insulated gate silicon carbide MOSFET.
- the effective channel mobility is improved to 50 cm 2 / (V ⁇ s) or more.
- the thickness of the formed transition layer can be suppressed to 1 nm or less.
- the concentration of hydrogen contained in the gate insulating film can be reduced, and the density of the gate insulating film can be increased. This makes it possible to obtain a low-loss semiconductor device having a high insulation withstand voltage, excellent reliability, high channel and conductance, low on-resistance.
- the heat treatment of the present embodiment is particularly preferably applied to a thermal oxide film having a thickness of 20 nm or less.
- a thermal oxide film having a thickness of 20 nm or less is formed by dry oxidation, a predetermined heat treatment is performed, and then oxides and nitrides of a required thickness are deposited on the thermal oxide film. And use it as a gate insulating film. With the gate insulating film formed in this way, reliability can be improved and quality can be improved.
- a gate insulating film such as a MISFET is used. Then, a case will be described in which an oxide film formed by performing dry annealing on the upper part of the SiC layer and then annealing under predetermined conditions is used.
- the pre-anneal in the fifth embodiment is performed in an atmosphere containing halogen instead of in a hydrogen atmosphere.
- This pre-anneal is performed at a temperature of 1 000 ° C for 30 minutes. Then, the temperature is lowered to 900 ° C while keeping the atmosphere containing halogen.
- a halogen radical may be generated as an active halogen, or a gas such as silicon tetrachloride, silane trichloride, or dichlorosilane containing a halogen may be used.
- the thermal oxide film of this embodiment is formed on the 4H-SiC (OOOI) Si surface to form a gate insulating film of an inversion-type enhancement gate type insulated gate silicon carbide MO SFET.
- OEOI 4H-SiC
- MO SFET inversion-type enhancement gate type insulated gate silicon carbide MO SFET.
- the thermal oxide film as described above is an inversion-enhancement type semiconductor device as shown in FIG. 2, a storage-type enhancement type semiconductor device as shown in FIG. 5, and (5) as shown in FIG. It can be used as a gate insulating film of a semiconductor device using a doped layer and a vertical semiconductor device as shown in Fig. 9.
- the structure of the semiconductor device excluding the gate insulating film has been described above. Since the structure is the same as that of the semiconductor device, the description of the structure and the manufacturing method of the semiconductor device is omitted.
- the thickness of the formed transition layer can be suppressed to 1 nm or less.
- the concentration of hydrogen contained in the gate insulating film can be reduced, and the density of the gate insulating film can be increased. This makes it possible to obtain a low-loss semiconductor device having a high insulation breakdown voltage, excellent reliability, and high channel conductance and low on-resistance.
- the thermal oxide film of the present embodiment is formed on the 4 HS i C (000 1) S i plane to form the gate insulating film of the inversion-type enhancement-type insulating gate-type silicon carbide MO SFET.
- V - s effective channel mobility 5 0 cm z Bruno
- the heat treatment of the present embodiment is particularly preferably applied to a thermal oxide film having a thickness of 20 nm or less.
- a thermal oxide film having a thickness of 20 nm or less is formed by dry oxidation, a predetermined heat treatment is performed, and then oxides and nitrides of a required thickness are deposited on the thermal oxide film. And use it as a gate insulating film. With the gate insulating film formed in this way, reliability can be improved and quality can be improved.
- Insulated gate transistors used as commercial power devices are designed with various structures to provide reverse withstand voltage or to pass the rated current with low on-resistance. Therefore, the insulated gate transistor of the present invention is not limited to the structures described in the first to sixth embodiments.
- the present invention can be applied to an insulated gate transistor having a planar RESURF structure, a particulate insulated gate transistor, or a trench gate insulated gate transistor. Even when these transistors are formed, the same effect as that of the gate insulating film in the first to sixth embodiments can be obtained.
- the present invention is applied to an insulated gate semiconductor device such as a DMIS, a trench isolation type MISFET, and an IGBT (insulated gate bipolar transistor) in addition to the semiconductor device described in the first to sixth embodiments. can do.
- the gate insulating film includes the first insulating film, the second insulating film, the first cap layer, and the second cap layer.
- the first insulating film and the second insulating film are formed, and the first cap layer and the second cap layer need not be formed.
- the second cap layer is not formed, particularly when the second insulating film is an oxynitride film, the second insulating film plays a role in preventing metal diffusion when forming a gate electrode. Therefore, the same effect as in the case where the second cap layer is formed can be obtained.
- the effect can be obtained even when the first insulating film is formed by being thermally oxidized in a wet atmosphere. Even when the second insulating film in the first to fourth embodiments is formed using the plasma CVD method, the same effects as those described in the first to fourth embodiments can be obtained. Can be.
- the semiconductor device of the present invention and the method of manufacturing the same are used as power devices mounted on electronic equipment. Used for
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- Formation Of Insulating Films (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Description
Claims
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| DE60239828T DE60239828D1 (de) | 2001-11-30 | 2002-11-27 | Ür |
| AU2002349589A AU2002349589A1 (en) | 2001-11-30 | 2002-11-27 | Semiconductor device and production method therefor |
| JP2003548317A JP4647211B2 (ja) | 2001-11-30 | 2002-11-27 | 半導体装置及びその製造方法 |
| US10/494,616 US7816688B2 (en) | 2001-11-30 | 2002-11-27 | Semiconductor device and production method therefor |
| EP02783666A EP1463121B1 (en) | 2001-11-30 | 2002-11-27 | Semiconductor device and production method therefor |
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| EP (1) | EP1463121B1 (ja) |
| JP (1) | JP4647211B2 (ja) |
| CN (1) | CN1599961A (ja) |
| AU (1) | AU2002349589A1 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1599961A (zh) | 2005-03-23 |
| DE60239828D1 (de) | 2011-06-01 |
| EP1463121A1 (en) | 2004-09-29 |
| AU2002349589A1 (en) | 2003-06-10 |
| JPWO2003047000A1 (ja) | 2005-04-14 |
| EP1463121A4 (en) | 2008-02-20 |
| US7816688B2 (en) | 2010-10-19 |
| US20050017272A1 (en) | 2005-01-27 |
| EP1463121B1 (en) | 2011-04-20 |
| JP4647211B2 (ja) | 2011-03-09 |
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