WO2003023837A1 - ELECTRODE FOR p-TYPE SiC - Google Patents
ELECTRODE FOR p-TYPE SiC Download PDFInfo
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- WO2003023837A1 WO2003023837A1 PCT/JP2002/008883 JP0208883W WO03023837A1 WO 2003023837 A1 WO2003023837 A1 WO 2003023837A1 JP 0208883 W JP0208883 W JP 0208883W WO 03023837 A1 WO03023837 A1 WO 03023837A1
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- electrode
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- type sic
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/60—Electrodes characterised by their materials
- H10D64/62—Electrodes ohmically coupled to a semiconductor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/01—Manufacture or treatment
- H10D64/011—Manufacture or treatment of electrodes ohmically coupled to a semiconductor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/80—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials
- 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
- H10D62/8325—Silicon carbide
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/822—Materials of the light-emitting regions
- H10H20/826—Materials of the light-emitting regions comprising only Group IV materials
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/83—Electrodes
- H10H20/832—Electrodes characterised by their material
Definitions
- the present invention relates to a silicon carbide (SiC) device. More specifically, the present invention relates to a p-type SiC electrode used for a SiC element. Background technology>
- SiC Silicon carbide
- SiC element that is, an ohmic electrode for p-type SiC
- TiAl titanium
- TiAl titanium
- Japanese Patent Application Laid-Open No. 5-138182 Japanese Patent Application Laid-Open No. 5-138182
- an element often requires an ohmic electrode.
- an element using a compound semiconductor generally cannot obtain an ohmic junction between a semiconductor material layer and an electrode without undergoing heat treatment, that is, it takes a shot when a metal layer is simply formed.
- the obtained contact resistance varies greatly depending on the semiconductor material, electrode material, heat treatment temperature, heat treatment time, and the like.
- Ti / Al which is expected to be a low-resistance ohmic contact material for P-type SiC, has achieved a considerable reduction in resistance, but in order to reduce the resistance, it requires a large amount of A1 and a long heat treatment temperature. It has been pointed out that time is required, the surface morphology deteriorates, and the device functions and the device life are shortened due to thermal damage to the semiconductor crystal layer.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a P-type SiC electrode having a good surface morphology and little thermal damage to a semiconductor crystal layer due to electrode formation. I do. ⁇ Disclosure of Invention>
- a p-type SiC electrode comprising a first electrode material comprising at least one selected from nickel (Ni), cobalt (Co), and palladium, and platinum (Pt).
- the p-type SiC electrode having the above-described configuration a higher temperature can be obtained by a heat treatment process at a lower temperature than before, and the flatness of the electrode surface can be improved. Also, ohmic properties can be obtained over a wide heat treatment range, and can be achieved in a short time even at high temperatures. As a result, the thermal effect on the semiconductor crystal layer due to the formation of the electrode can be reduced. Therefore, by using the p-type SiC electrode of the present invention, it is possible to produce a SiC device having excellent device characteristics.
- the p-type SiC electrode refers to an electrode formed on a p-type SiC semiconductor layer.
- the type of the p-type SiC semiconductor to which the p-type SiC electrode of the present invention is applied is not particularly limited, and includes a 4H type, a 6H type, a 15R type, a 21R type, a 3C type, etc. Including. Further, the type of the element to which the p-type SiC electrode of the present invention is applied is not particularly limited, and can be applied to various elements used for a high-frequency power device, a high-temperature device, an optoelectronic device, and the like.
- the first electrode material it is particularly preferable to use nickel or cobalt, from the viewpoint of reacting with Si at a relatively low temperature.
- the ⁇ -type SiC electrode of the present invention further includes a second electrode material made of aluminum (A1) in addition to the first electrode material.
- A1 aluminum
- the contact resistivity can be reduced, and a p-type SiC electrode with better ohmic properties can be constructed.
- the electrode for p-type SiC of the present invention preferably further contains a third electrode material made of titanium (Ti). That is, it is preferable to include a first electrode material such as nickel, a second electrode material made of aluminum, and a third electrode material made of titanium. By including the third electrode material made of titanium in this way, further cost The contact resistivity is reduced.
- the P-type SiC electrode of the present invention preferably includes a layer made of a first electrode material (hereinafter, referred to as a “first electrode material layer”), and the first electrode material layer is a P-type SiC semiconductor layer. More preferably, it is formed in contact with.
- a layer made of a first electrode material is formed on a P-type SiC semiconductor layer, a layer made of another electrode material is laminated, and these layers are heat-treated to form a p-type SiC electrode of the present invention. Can be formed.
- the electrode for p-type SiC of the present invention contains the second electrode material in addition to the first electrode material
- a layer composed of the first electrode material layer and the second electrode material hereinafter, referred to as a “first electrode material layer”.
- first electrode material layer a layer composed of the first electrode material layer and the second electrode material
- two-electrode material layer it is preferable that the first electrode material layer and the second electrode material layer are formed in the manufacturing process.
- the lamination order of the first electrode material layer and the second electrode material layer is not particularly limited, but may be formed by laminating the first electrode material layer and the second electrode material layer sequentially from the p-type SiC semiconductor layer side. preferable.
- the first electrode material layer is formed in contact with the p-type SiC semiconductor layer.
- a layer made of another material can be interposed between the first electrode material layer and the second electrode material layer.
- a plurality of first electrode material layers and / or second electrode material layers may be provided.
- the first electrode material layer / second electrode material layer / first electrode material may be arranged in order from the p-type SiC semiconductor layer side.
- the p-type SiC electrode of the present invention may be formed by stacking layers.
- the P-type SiC electrode of the present invention contains the first electrode material, the second electrode material, and the third electrode material, the first electrode material layer, the second electrode material layer, and It is preferable to include a layer made of a third electrode material (hereinafter, referred to as “third electrode material layer”).
- third electrode material layer a layer made of a third electrode material
- the first electrode material layer, the second electrode material layer, and the third electrode material layer are formed in the manufacturing process.
- the stacking order of these layers is not particularly limited, but it is preferable that the first electrode material layer, the third electrode material layer, and the second electrode material layer are sequentially stacked from the P-type SiC semiconductor side.
- the first electrode material layer is formed in contact with the p-type SiC semiconductor layer.
- a layer made of another material may be interposed between the first electrode material layer and the third electrode material layer, and between the first and third electrode layers and the second electrode layer.
- the first electrode material A plurality of material layers, third electrode material layers, and a plurality of Z or second electrode material layers may be provided.
- the method for forming the first electrode layer, the second electrode layer, and the third electrode layer is not particularly limited, and an MBE method, a vacuum evaporation method, a sputtering method, a resistance heating method, or the like can be employed.
- the P-type SiC electrode of the present invention is formed by laminating the above-mentioned electrode material layer (and other layers) on the p-type SiC semiconductor layer and then performing a heat treatment. Prior to forming the electrode material layer, it is preferable to clean (eg, chemically clean) the p-type SiC semiconductor. This is for laminating the electrode materials in a favorable state.
- the p-type heat treatment is performed to form an ohmic contact between the p-type SiC semiconductor layer and the p-type SiC electrode of the present invention.
- the heating temperature and the heating time are appropriately adjusted so that a good ohmic contact is formed.
- the heating temperature is, for example, 400 ° C. to 110 ° C., preferably 600 ° C.
- the heating time is, for example, 2 minutes to 100 minutes, preferably 2 minutes to 50 minutes, and more preferably 5 minutes to 30 minutes.
- the heat treatment can be performed in an inert gas atmosphere. Nitrogen gas, helium gas, argon gas and the like can be used as the inert gas.
- Figure 1 is a graph showing the results of Experimental Example 1, and shows the dependence of the contact resistivity (pc) after heat treatment at 1000 ° C for 2 minutes on the A1 concentration in NiAl.
- FIG. 2 is a graph showing the results of Experimental Example 2, showing the current-voltage (I-V) characteristics of the CoAl / SiC contact after heat treatment at 800 ° C. for 10 minutes.
- Figure 3 is a graph showing the results of Experimental Example 3.
- the current-voltage (I-V) characteristics of each sample (Ti / Al, Ni / Al, Ni / Ti / Al) after heat treatment at 800 ° C for 10 minutes are shown. Is shown.
- Fig. 4 is a graph showing the results of Experimental Example 3, where the sample has a Ni / Ti / Al laminated structure. 2 shows the change in the contact resistivity (pc) when the thickness difference between the Ni layer and the Ti layer was changed.
- FIG. 5 is a diagram schematically showing the configuration of the SiC element 1 according to one embodiment of the present invention.
- the substrate had use a commercially available p-type 4H-SiC (0001) Epiweha (A1 concentration 6. 4 ⁇ 9. 0xl0 18 cm- 3).
- a thermal oxide film was formed to a thickness of 10 nm, and a circular TLM pattern was created by a photolithography method.
- Ni and A1 were deposited by an electron beam method and a resistance heating method, and contact materials were prepared by changing the respective film thicknesses.
- the electrode pattern was formed by the lift-off process, heat treatment was performed at 800 ° C to 1000 ° C in an ultra-high vacuum chamber.
- the resistivity and surface crystallinity of each sample were evaluated by circular TLM, X-ray diffraction (XRD), Rutherford backscattering (RBS), and optical microscopy.
- FIG. 1 shows the dependence of the contact resistivity (pc) on the Al concentration in NiAl after heat treatment at 1000 ° C for 2 minutes. Compared with TiAl contact material, a small A1 concentration (40At./ below.) Any 1 ( ⁇ 4 ⁇ - cm 2 units P c is obtained, in Al concentration 80at% 9 ⁇ 10- 5 ⁇ - cm 2 was achieved.
- the contact resistivity increases as the A1 concentration increases. A1 plays an important role in reducing the contact low resistance. Even after the heat treatment at 1000 ° C, a flatter surface was obtained compared to TiAl.
- Heat treatment temperature and electrode surface flatness were investigated for CoAl ohmic contact material for p-type 4H-SiC.
- a commercially available p-type 4H-SiC (OOOl) epi wafer (A1 concentration: 1.0xl0 19 cra " 3 ) was used as the substrate.After chemically cleaning the substrate, a thermal oxide film was formed by lOnm, and it was made circular by photolithography. After the oxide film was stripped using dilute hydrofluoric acid, metal layers of Co and A1 were deposited by electron gun evaporation and resistance heating. After forming the electrode pattern by the lift-off process, heat treatment was performed at 800 ° C for 10 minutes to 1000 ° C for 2 minutes in an ultra-high vacuum chamber.
- the resistivity and surface crystallinity of each sample were evaluated by circular TLM, X-ray diffraction (XRD), Rutherford backscattering (RBS), and optical microscopy. Shows current-voltage (I-V) characteristics of CoAl / SiC contact after heat treatment, thin A1 interlayer lOnm and Good Omikku properties was confirmed in 40nm samples. Furthermore 1000 ° C, by the addition of 2 minutes heat treatment, the contact resistance ratio was reduced to 4x10- 4 ⁇ cm 2.
- the heat treatment temperature and the electrode surface flatness when Ni was used in the ohmic contact material for p-type 4H-SiC were investigated.
- the substrate had use a commercially available p-type 4H- SiC (OOOl) Epiweha (A1 concentration 3. 0 ⁇ 8. Lxl0 18 cnf 3) .
- OEOl p-type 4H- SiC
- a thermal oxide film was formed by lOnm, and a circular TLM pattern was drawn by a photolithography method.
- a metal layer of Ni and Ti was deposited by an electron beam method, and a metal layer of A1 was deposited by a resistance heating method.
- the laminated structure is Ti / Al (Layer of Ti layer and A1 layer in order from the SiC side, the same applies hereinafter), Ni / Al ⁇ Ni / Ti / Al Was prepared.
- Ni / Ti / Al For Ni / Ti / Al, multiple samples with different thicknesses of the Ni layer and Ti layer were prepared. The vacuum degree during the deposition was set to 1x10- 6 Torr. After the electrode pattern was formed by the lift-off process, heat treatment was performed in an ultra-high vacuum chamber at 800 ° C for 5 to 30 minutes. The resistivity and surface crystallinity of each sample were evaluated by circular TLM, X-ray diffraction (XRD), Rutherford backscattering (RBS), and optical microscopy.
- Figure 3 shows the current-voltage (IV) characteristics of each sample (Ti / Al, Ni / Al, Ni / Ti / Al) after heat treatment at 800 ° C for 10 minutes.
- Ni / Al did not achieve ohmic properties by heat treatment at 800 ° C
- the samples with Ni layer did exhibit ohmic properties. I understand. That is, it was confirmed that the adoption of the Ni layer makes it possible to form an ohmic contact with a heat treatment at a lower temperature than before.
- the surfaces of Ni / Al and Ni / Ti / Al after heat treatment were very flat.
- FIG. 4 shows the relationship between the thickness of the Ni layer and the Ti layer and the contact resistivity (pc) in the sample having the Ni / Ti / Al laminated structure.
- Ni (I5nra) / Ti (50nm) / Al (300nm) ( or more Al concentration is 8. 1 x 10 18 ( ⁇ 3 ) regardless of the Al concentration of the substrate, thick Ni layer formed It can be seen that the resistivity decreases as a result of this, that is, the resistivity shows a dependency on the Ni film thickness, and that the Ni (25 nm) / Ti (50 nm) / Al (300 nm) condition 6 64x10- 5 ⁇ -. are able to achieve cm 2.
- FIG. 5 is a diagram schematically showing a configuration of a SiC device 1 according to one embodiment of the present invention.
- the SiC element 1 can be manufactured as follows.
- an n-type SiC substrate 10 is placed in a chamber of a vapor phase growth apparatus, and hydrogen gas is used as a carrier gas, and monosilane (SiH 4 ) gas and propane (C 3 H 8 ) as raw material gases are converted into an impurity gas of trimethyl aluminum ((C) 3 A1) gas was supplied into the chamber, for about 1 to 4 0 0 ° p-type SiC layer 1 1 at a growth temperature of C to about 5 mu m formed.
- hydrogen gas is used as a carrier gas
- monosilane (SiH 4 ) gas and propane (C 3 H 8 ) as raw material gases are converted into an impurity gas of trimethyl aluminum ((C) 3 A1) gas was supplied into the chamber, for about 1 to 4 0 0 ° p-type SiC layer 1 1 at a growth temperature of C to about 5 mu m formed.
- the p-type SiC layer 11 is formed by a well-known method such as a molecular beam crystal growth method (MBE method), a halide vapor phase growth method (HVPE method), a sputtering method, an ion plating method, and an electron shower method. You can also.
- MBE method molecular beam crystal growth method
- HVPE method halide vapor phase growth method
- sputtering method an ion plating method
- an electron shower method an electron shower method. You can also.
- sacrificial oxidation is performed in an O 2 atmosphere at 1150 ° C. for 60 minutes to form a SiO 2 film 12 to a thickness of about 10 nm on the surface of the p-type SiC layer 11.
- the electrode patterns Jung having conducted by photolithography and foremost, to peel off the part of the Si0 2 film with diluted hydrofluoric acid.
- a Ni layer 21 is formed to a thickness of about 25 ⁇ by an electron beam method.
- the Ti layer 22 is formed by the electron beam method and the A1 layer 23 is formed by the resistance heating method
- an electrode pattern is formed by a lift-off process.
- heat treatment is performed at 800 ° C. for 10 minutes in an ultra-high vacuum chamber.
- an n-type electrode 30 composed of V and A1 is formed on the surface of the n-type SiC substrate 1 by an evaporation method. After the above steps, a chip separation step is performed using a scriber or the like to obtain a SiC element 1.
- the present invention is not limited to the description of the embodiment of the present invention. Special Various modifications are included in the present invention without departing from the scope of the appended claims and within the scope of those skilled in the art. Needless to say, the present invention can be used for other semiconductor devices using SiC, such as a group III nitride compound semiconductor on SiC.
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02760799A EP1424725A4 (en) | 2001-09-06 | 2002-09-02 | ELECTRODE FOR p-SiC |
| US10/415,914 US6943376B2 (en) | 2001-09-06 | 2002-09-02 | Electrode for p-type SiC |
| KR10-2003-7006055A KR100532277B1 (ko) | 2001-09-06 | 2002-09-02 | 피형 실리콘 카바이드용 전극 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-270771 | 2001-09-06 | ||
| JP2001270771A JP4026339B2 (ja) | 2001-09-06 | 2001-09-06 | SiC用電極及びその製造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003023837A1 true WO2003023837A1 (en) | 2003-03-20 |
Family
ID=19096383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/008883 Ceased WO2003023837A1 (en) | 2001-09-06 | 2002-09-02 | ELECTRODE FOR p-TYPE SiC |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6943376B2 (ja) |
| EP (1) | EP1424725A4 (ja) |
| JP (1) | JP4026339B2 (ja) |
| KR (1) | KR100532277B1 (ja) |
| CN (1) | CN1473355A (ja) |
| TW (1) | TWI270126B (ja) |
| WO (1) | WO2003023837A1 (ja) |
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| KR100479650B1 (ko) * | 2003-04-10 | 2005-04-07 | 주식회사 다윈 | 엇배열 디자인 구조를 갖는 웨이퍼 및 이를 이용한반도체패키지 제조방법 |
| JP4935075B2 (ja) * | 2006-01-05 | 2012-05-23 | 住友電気工業株式会社 | 電極一体形成型窒化物系半導体装置 |
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2001
- 2001-09-06 JP JP2001270771A patent/JP4026339B2/ja not_active Expired - Fee Related
-
2002
- 2002-09-02 WO PCT/JP2002/008883 patent/WO2003023837A1/ja not_active Ceased
- 2002-09-02 CN CNA028028295A patent/CN1473355A/zh active Pending
- 2002-09-02 EP EP02760799A patent/EP1424725A4/en not_active Withdrawn
- 2002-09-02 KR KR10-2003-7006055A patent/KR100532277B1/ko not_active Expired - Fee Related
- 2002-09-02 US US10/415,914 patent/US6943376B2/en not_active Expired - Fee Related
- 2002-09-05 TW TW091120274A patent/TWI270126B/zh not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63283014A (ja) * | 1987-04-28 | 1988-11-18 | Sharp Corp | 炭化珪素半導体素子 |
| JPH01268121A (ja) * | 1988-04-20 | 1989-10-25 | Sanyo Electric Co Ltd | シリコン系半導体素子のオーミック電極形成方法 |
| JPH0485972A (ja) * | 1990-07-30 | 1992-03-18 | Sanyo Electric Co Ltd | p型SiCの電極形成方法 |
| WO1994006153A1 (en) * | 1992-09-10 | 1994-03-17 | Cree Research, Inc. | Ohmic contact structure between platinum and silicon carbide |
| US20010002705A1 (en) * | 1998-06-08 | 2001-06-07 | Peter Friedrichs | Semiconductor configuration with an Ohmic contact-connection and method for contacting a semiconductor configuration |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP1424725A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1424725A4 (en) | 2005-08-03 |
| CN1473355A (zh) | 2004-02-04 |
| KR20040015018A (ko) | 2004-02-18 |
| KR100532277B1 (ko) | 2005-11-29 |
| JP2003077860A (ja) | 2003-03-14 |
| US6943376B2 (en) | 2005-09-13 |
| TWI270126B (en) | 2007-01-01 |
| JP4026339B2 (ja) | 2007-12-26 |
| EP1424725A1 (en) | 2004-06-02 |
| US20040016929A1 (en) | 2004-01-29 |
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