WO2000001005A1 - Method for forming monocrystalline silicon layer, method for manufacturing semiconductor device, and semiconductor device - Google Patents
Method for forming monocrystalline silicon layer, method for manufacturing semiconductor device, and semiconductor device Download PDFInfo
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- WO2000001005A1 WO2000001005A1 PCT/JP1999/003522 JP9903522W WO0001005A1 WO 2000001005 A1 WO2000001005 A1 WO 2000001005A1 JP 9903522 W JP9903522 W JP 9903522W WO 0001005 A1 WO0001005 A1 WO 0001005A1
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- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
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- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
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- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
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Definitions
- the present invention relates to a method of forming a single-crystal silicon layer, a method of manufacturing a semiconductor device, and a semiconductor device, and more particularly to an insulating gate type using a single-crystal silicon layer epitaxially grown on an insulating substrate for an active region.
- the present invention relates to a method suitable for manufacturing a semiconductor device such as a field effect transistor, and the semiconductor device. Background art
- a silicon epitaxy growth layer is formed by cooling from indium. Silicon solution or indium gallium. Silicon solution heated to 90 to 93 ° C.
- MATERIALS LETTERS. Vol. 9. No. 2 and 3 Soo Hong Lee, "Very-low-temperature liquid-phase epaxial growth of silicon”. Jan., 1990) ppo 3-56.
- a step is formed on a quartz substrate, a polycrystalline silicon layer is formed thereon, and then this is heated to 140 ° C. or more by a laser beam or a strip heater.
- the heated polycrystalline silicon layer forms an epitaxial growth layer using the steps formed on the quartz substrate as nuclei (Ref. 6, Shizuhiro Furukawa, "Grafoepitaxy", IEICE, Vol. 66, No. 5, pp486-489. (1983. May).
- Reference 7 Geis, Mf., Et al .: "Crystal lographic orientation of silicon on an amorphous substrate using an artificial-relief grating and Laser crystallization ", Appl. Phys. Letter, 35, 1, p71-74 (July 1979).
- the epitaxy growth temperature is set to 800 ° C, especially 70 ° C. There was a problem that the temperature could not be significantly reduced from 00 ° C. For this reason, there is no technology capable of performing epitaxial growth at a low temperature on a silicon substrate or the like, or a technology capable of forming a silicon epitaxial growth layer on a large glass plate with a relatively low strain point. . Also, in the technology for forming silicon on a glass plate and using this as the nucleus of epitaxy to grow silicon, silicon is epitaxially grown at low temperature and uniformly. It is not possible. Disclosure of the invention
- the present invention has been made in view of such a problem, and an object thereof is to uniformly grow a single crystal silicon layer at low temperature even on a large glass substrate having a relatively low strain point, thereby achieving high speed and large scale. It is intended to provide a method for forming a single crystal silicon layer, a method for manufacturing a semiconductor device, and a semiconductor device capable of forming a semiconductor element having a current density.
- the method for forming a single-crystal silicon layer according to the present invention is as follows: a single-crystal silicon layer is formed on a material layer lattice-matched to the single-crystal silicon layer by a catalytic CVD (Chemical Vapor Deposition) method (a chemical vapor deposition method using a catalyst). It forms a layer.
- a catalytic CVD Chemical Vapor Deposition
- Another method for forming a single crystal silicon layer according to the present invention is to form a single crystal silicon layer on a single crystal silicon substrate by a catalytic CVD method.
- the method of manufacturing a semiconductor device according to the present invention includes, in addition to the step of forming the single-crystal silicon layer, a step of thereafter performing a predetermined process on the single-crystal silicon layer to manufacture a semiconductor device. .
- a material layer lattice-matching with a single crystal silicon is formed on an insulating substrate, a single crystal silicon layer is formed on the material layer, and the single crystal silicon layer forms a semiconductor element. Is what it is.
- a material layer for example, a crystalline sapphire layer
- a material layer lattice-matched with single crystal silicon or a single crystal silicon substrate of balta
- a catalytic CVD method epitaxial
- the material layer serving as the nucleus of the silicon epitaxial growth can be formed by a low pressure CVD method (chemical vapor deposition under reduced pressure: substrate temperature of 500 to 600 ° C.).
- a single-crystal silicon layer is formed on a layer or a single-crystal silicon substrate by a low-temperature film forming technique called catalytic CVD (substrate temperature: 100 to 700 ° C, especially 200 to 600 ° C). Therefore, a single-crystal silicon layer can be uniformly formed on the substrate at a low temperature.
- the above material layer such as a crystalline sapphire layer or a single crystal silicon substrate is used. Therefore, since the lattice constant is matched with that of single crystal silicon, lattice matching is good, and silicon epitaxial growth becomes easy.
- (B) Therefore, not only quartz glass, but also a glass substrate with relatively low strain point, a ceramic substrate, or a bulk single-crystal silicon substrate can be easily obtained as a base substrate.
- the glass substrate can be formed into a wide and long roll shape, and a single-crystal silicon layer can be formed continuously.
- the quality of the silicon epitaxial layer can be improved. Specifically, since the diffusion amount of the impurity is reduced, the control accuracy of the concentration and the thickness of the silicon epitaxial layer is improved. In particular, when a silicon epitaxial layer is formed on a sapphire substrate, thermal distortion can be reduced, and further, autodoping of aluminum can be suppressed.
- reaction efficiency of the reaction gas such as silane is high (several percent or less in the conventional CVD method and several tens% in the catalytic CVD method), it saves resources and reduces the burden on the environment and reduces costs. can do.
- the above-mentioned material layer such as a crystalline sapphire layer acts as a diffusion barrier for various atoms, so that diffusion of impurities from a glass substrate or other substrates can be suppressed.
- FIG. 1A and 1B are cross-sectional views illustrating a manufacturing process of the semiconductor device according to the first embodiment of the present invention in the order of steps.
- FIG. 2A to 2C are cross-sectional views illustrating a manufacturing process following FIG. 1B in the order of steps.
- 3A to 3D are cross-sectional views illustrating a manufacturing process following FIG. 2C in the order of steps.
- 4A to 4C are cross-sectional views illustrating a manufacturing process subsequent to FIG. 3D in the order of steps.
- FIG. 5 is a schematic diagram of a catalytic CVD device used for manufacturing a semiconductor device according to the first embodiment of the present invention.
- 6A to 6C are cross-sectional views showing the manufacturing process of the semiconductor device according to the second embodiment of the present invention in the order of steps.
- 7A to 7C are cross-sectional views illustrating a manufacturing process following FIG. 6C in the order of steps.
- 8A to 8C are cross-sectional views showing the manufacturing process following FIG. 7C in the order of steps.
- 9A to 9D are cross-sectional views illustrating a manufacturing process following FIG. 8C in the order of steps.
- FIG. 10A and FIG. 10B are schematic perspective views for explaining the state of silicon crystal growth on an amorphous substrate.
- FIG. 118 to FIG. 11F are schematic cross-sectional views showing various step shapes and silicon growth crystal orientations in the graphepitaxial technology.
- FIG. 12 is a photograph showing a single crystal silicon layer on a substrate according to the fourth embodiment of the present invention.
- FIG. 13 is a photograph showing a single-crystal silicon layer on a substrate according to the fourth embodiment of the present invention.
- FIG. 14 is a photograph showing a single-crystal silicon layer on a substrate according to the fourth embodiment of the present invention.
- the single-crystal silicon layer is formed by a catalytic CVD method (substrate temperature: about 100 to 700 ° C., particularly 200 to 600 ° C.). I do.
- a catalytic CVD method substrate temperature: about 100 to 700 ° C., particularly 200 to 600 ° C.
- a gas mainly composed of gay hydride is supplied at 800 to 200 ° C, for example, 160 to 180 ° C. It is preferable to deposit a single-crystal silicon layer on the substrate by decomposing it by contact with a catalyst body heated to a temperature lower than the melting point.
- Silane for example, monosilane, disilane, trisilane
- tungsten tungsten containing thorium oxide, molybdenum, platinum, palladium, silicon, alumina, metal is used as the catalyst.
- an insulating substrate particularly a glass substrate having a low strain point
- a semiconductor crystal layer can be formed over a large glass substrate having an area of lm 2 or more. Since the substrate temperature at the time of performing the catalytic CVD is low as described above, a glass having a low strain point of 470 to 670 ° C. can be used as the glass substrate. This kind of glass is inexpensive and easy to make thin, and a long rolled glass sheet can be produced.
- a thin epitaxial growth layer can be continuously or discontinuously formed on such a long rolled glass plate.
- the substance layer can be formed using a substance selected from the group consisting of crystalline sapphire, a spinel structure, and calcium fluoride, or single-crystal silicon.
- This material layer can be formed as a thin film on an insulating substrate such as a glass substrate, for example, but may also serve as the bulk substrate itself.
- a single crystal silicon layer is formed by the catalytic CVD method of the present embodiment
- hydrogen gas is brought into contact with a heated catalyst body, and hydrogen atoms activated thereby are used as an etchant to form a natural oxide film. Can be removed by etching.
- a semiconductor element can be manufactured by depositing a single-crystal silicon layer using the above-described material layer or single-crystal silicon substrate as a seed, and then subjecting the single-crystal silicon layer to a predetermined treatment.
- Group 3 or Group 5 element and supplied as such (B, P, S b, A s , etc.) the B 2 H e or PH 3, and an appropriate amount de one-flop
- the impurity species and / or concentration of the growing silicon epitaxial layer that is, the conductivity type such as P-type and N-type of the single-crystal silicon layer and the Z or carrier concentration.
- the single crystal silicon layer epitaxially grown on the substrate is applied to the channel region, the source region, and the drain region of the insulated gate field effect transistor, and the impurity species of each of these regions is increased.
- Z or its concentration can also be controlled.
- the above-mentioned material layer acts as a seed during the epitaxial growth of the single-crystal silicon layer.
- a step that becomes a seed for the epitaxial growth is formed on a substrate such as an insulating substrate by reactive ion etching. If a material layer is formed on the substrate including the steps by dry etching such as that described above, the steps also serve as nuclei for epitaxial growth of the single crystal silicon layer. Such a step can be formed in the material layer.
- a similar step may be formed on the single crystal silicon substrate, the sapphire substrate, or the germanium substrate itself, and the single crystal silicon layer may be epitaxially grown on the substrate including the step.
- a crystalline sapphire layer formed on an insulating substrate is used as a shield.
- a single crystal silicon layer is epitaxially grown at a low temperature by a medium CVD method.
- an insulating substrate 1 made of quartz glass, crystallized glass, or the like (particularly, having a strain point of about 470 to 140.
- a crystalline sapphire layer (thin film) (thickness: 5 to 200 nm) 50 is formed on one principal surface of 50 micron to several mm thick at ° C.
- the crystalline sapphire layer 50 is formed by oxidizing trimethylaluminum gas by a known low-pressure CVD method, high-density plasma CVD method, or catalytic CVD method (see JP-A-63-43014). It is made by oxidizing with a reactive gas (oxygen and moisture) and crystallizing.
- the single crystal silicon layer ⁇ is epitaxially grown to a thickness of several m to 0.05 m (for example, 0.1 m) over the entire surface.
- This catalytic CVD can be performed using the catalytic CVD apparatus shown in FIG.
- hydride (eg, monosilane) gas 40 (and, if necessary, doping gas such as hydrogen and B 2 H 6 and PH 3 ) is supplied from the supply pipe to the deposition chamber 4.
- doping gas such as hydrogen and B 2 H 6 and PH 3
- a susceptor 42 for supporting the substrate 1 and a coil-shaped catalyst 43 opposed to the susceptor 42 are arranged inside the deposition chamber 41.
- the substrate 1 is heated by an external heating means 44 (for example, an electric heating means), and the catalyst body 43 is made of, for example, a resistance wire having a melting point or lower (especially 800 to 200 ° C., for example, 160 to 1 It is activated by heating to 800 ° C, or about 180 ° C for tungsten).
- an external heating means 44 for example, an electric heating means
- the catalyst body 43 is made of, for example, a resistance wire having a melting point or lower (especially 800 to 200 ° C., for example, 160 to 1 It is activated by heating to 800 ° C, or about 180 ° C for tungsten).
- a glass substrate 1 on which a crystalline sapphire layer has been formed is passed through an orifice chamber to a substrate 42 (a normal SiC coating) capable of controlling the temperature in the chamber 41.
- a substrate 42 a normal SiC coating
- reduce the pressure in the chamber to about l ⁇ 2 xl O- 6 Pa.
- exhaust the moisture and oxygen introduced into the chamber About 5 minutes.
- hydrogen is flowed into the chamber, and the flow rate, pressure, and susceptor temperature are controlled to predetermined values.
- Chamber pressure about 0.1 to 15 Pa.
- Susceptor temperature 100 to 700 Pa. C (here, set to 200 ° C)
- Hydrogen flow rate Set to 90 s ccm / min.
- the temperature of the catalyst body (for example, a thin tungsten wire) 43 is increased.
- the catalyst temperature ranges from about 160 to 180;
- the temperature is set to about C (here, the catalyst temperature is set to 180 ° C.), and this state is maintained for 10 minutes.
- the hydrogen flow rate is reduced to zero and the pressure is reduced to about 1 to 2 xl 0 to 6 Pa.
- the SiH 4 introduced into the chamber is evacuated (about 5 minutes). After that, the glass substrate having the single-crystal silicon layer formed on the crystalline sapphire film is taken out to the outside of the atmospheric pressure through the mouthpiece chamber.
- a silicon atom or a group of silicon atoms having high energy is formed by the catalytic reaction or the thermal decomposition reaction by the catalyst body 43, and the seed is formed. Since the monocrystalline silicon layer is deposited on the crystalline sapphire layer 50 to be formed, the single crystal silicon layer can be deposited in a low temperature region which is significantly lower than a deposition temperature in a normal thermal CVD method.
- the energy required for forming the silicon epitaxial layer can be supplied in two stages.
- the catalyst 43 at a high temperature for example, 160 to 180 ° C.
- a reaction gas for epitaxy growth from silane gas, for example, silane and hydrogen.
- the reactant gas for epitaxy growth from silane gas, for example, silane and hydrogen.
- the reactant gas for epitaxy growth from silane gas, for example, silane and hydrogen.
- the reactant gas for epitaxy growth from silane gas, for example, silane and hydrogen.
- the reactant gas for epitaxy growth from silane gas, for example, silane and hydrogen
- the silicon, hydrogen atoms or molecules having high energy are brought into contact with the substrate at a relatively high temperature within the above range, particularly by silicon. It supplies the energy needed to align the atoms along the crystal orientation of the substrate.
- a silicon epitaxial layer can be formed even at 200 to 600 ° C.
- the silicon is grown heteroepitaxially using the crystalline sapphire layer 50 as a seed, as shown in FIG. 1B, and has a thickness of, for example, about 0.1 // m. Deposited as a crystalline silicon layer 7.
- silicon for example, a (100) plane is epitaxially grown on the crystalline sapphire layer 50.
- a gate oxide film 8 having a thickness of 350 is formed on the surface of the single crystal silicon layer 7 by an oxidation treatment (950 ° C.).
- the P-channel MOS transistor portion is masked with photoresist 9 and the P-type impurity ions are removed. (e.g., B +) 1 0 in the example 1 0 k V 2. implanted at 7 1 0 11 dose of at oms / cm 2, the conductivity type of the single crystal silicon layer 7 and the P-type phased single crystal silicon layer 1 1 I do.
- the N-channel MOS transistor portion is masked with photoresist 12 this time, and the N-type impurity is masked.
- ions (for example, P +) 13 are implanted at a dose of 1 ⁇ 10 11 atoms / cm 2 at 10 kV, for example, to form a single-crystal silicon layer 14 that compensates for the P-type of the single-crystal silicon layer 7. .
- the lead polycrystalline as a gate electrode material The silicon layer 15 is deposited to a thickness of 400 OA by, for example, the CVD method (temperature: 6200 C C). Thereafter, as shown in FIG. 3B, a photoresist 16 is formed in a predetermined pattern, and using this as a mask, the polycrystalline silicon layer 15 is patterned into a gate electrode shape. Furthermore, after removing photoresists 1 6, urchin I are shown in 3 C Figure, for example 9 0 0 ° C in for 60 minutes, the oxidation on the surface of the gate polycrystalline silicon layer 1 5 in the oxidation treatment in 0 2 A film 17 is formed.
- the P-channel MO transistor portion is masked with a photoresist 18 and an N-type impurity, for example, As + ion 19 is added to, for example, 20 kV at 5 ⁇ 10 15 Ions are implanted at a dose of atoms / cm 2 , and the N + -type source region 20 and the drain region 21 of the N-channel MOS transistor are respectively implanted by annealing in N 2 at 950 ° C. for 40 minutes.
- the N-channel MOS transistor portion is masked with a photoresist 22 and a P-type impurity such as B + ion 23 is subjected to 5 ⁇ 10 15 at 1 OkV for example.
- a dose of at om s / cm 2 the P + -type source region 24 and the drain region 25 of the P-channel MOS transistor are annealed in N 2 at 900 ° C. for 5 minutes. Form each.
- the entire surface C VD method 5 0 0 A thickness at S i 0 2 film 2 6 example 7 5 0 ° C
- the S i N film 2 7 For example, it is laminated at a temperature of 420 ° C. to a thickness of 2000, and a boron and phosphorus-doped silicate glass (BPSG) film 28 is used as a reflow film, for example, a thickness of 600 A at 450 ° C.
- the BPSG film 28 is reflowed in N 2 at, for example, 900 ° C.
- a contact window is opened at a predetermined position of the insulating film, and an electrode material such as aluminum is applied to the entire surface including each hole at 150 ° C. for 1 m by sputtering or the like.
- the source or drain electrode 29 (S or D) and the gate extraction electrode or wiring 30 (G) of each of the P-channel MOS TFT and the N-channel MOS TFT are deposited. To complete each MOS transistor.
- the catalyst CVD method was used to set the crystalline sapphire layer 50 as a seed to 200
- the single-crystal silicon layer 7 can be uniformly formed on the glass substrate 1 at a low temperature of about 600 ° C.
- a single-crystal silicon layer can be formed on an insulating substrate such as a ceramic substrate as well as a low-strain-point glass substrate, a substrate material with a low strain point, low cost and good physical properties Can be arbitrarily selected, and the substrate can be made longer (for example, 50 // m thick at 10 Om or more) and larger (lm 2 or more).
- the quality of the single crystal silicon layer 7 can be improved. Specifically, since the amount of diffusion of impurities is reduced, the control accuracy of the concentration / thickness of the single crystal silicon layer is improved. In particular, when a single crystal silicon layer is formed on a sapphire layer, thermal strain can be reduced.
- the heating power source requires low power and the cooling mechanism Is simpler, so the silicon epitaxial device is less expensive.
- reaction efficiency of the reaction gas such as silane is high (several percent or less in the conventional CVD method and several tens% in the catalytic CVD method), it saves resources, reduces the burden on the environment and reduces costs. can do.
- the crystalline sapphire layer 50 acts as a barrier for suppressing the diffusion of atoms from the glass substrate 1 to the single-crystal silicon layer 7.
- the electron mobility of the single-crystal silicon layer 7 formed on a glass substrate or the like is 540 cm 2 / vsec, which is as large as that of a single-crystal silicon substrate.
- High density transistors can be made.
- diodes, capacitors, resistors, etc., and electronic circuits integrating these can be formed on a glass substrate.
- the process for forming a silicon semiconductor element such as a MOS transistor is almost the same as the process for fabricating a conventionally known polycrystalline silicon TFT.
- a step serving as a seed for epitaxial growth of single crystal silicon is provided on an insulating substrate, and the above-described crystalline sapphire layer is formed on the surface including the step, and the function of the crystalline sapphire layer
- a single crystal silicon layer is epitaxially grown at a low temperature by adding a step to the surface.
- a photoresist 2 is formed in a predetermined pattern on one main surface of an insulating substrate 1 such as quartz glass or crystallized glass, and this is used as a mask, for example, F + of CF 4 plasma. Irradiate with ions 3 and form a plurality of steps 4 on substrate 1 by reactive ion etching (RIE).
- RIE reactive ion etching
- a known reduced pressure CVD method and a catalytic CVD method are performed in the same manner as described in the first embodiment.
- the crystalline sapphire layer 50 is deposited to a thickness of 5 to 200 nm on the entire surface including the step 4 by a high temperature plasma CVD method (0 to 65 ° C).
- the single-crystal silicon layer 7 is formed on the crystalline sapphire layer 50 by the catalytic CVD method in the same manner as described in the first embodiment. Deposit to a thickness of several / m to 0.005 m (eg, 0.1 / m) at 0 to 600 ° C.
- silicon is epitaxially grown using the crystalline sapphire layer 50 as a seed, and a single-crystal silicon layer 7 having a thickness of, for example, about 0.1 m is formed.
- the single-crystal silicon layer 7 has a (100) plane heteroepitaxially grown on the crystalline sapphire layer 50 as described in the first embodiment. , Is further promoted by step 4. Step 4 is the force that acts as the nucleus (seed) of epitaxy growth. This is due to a known phenomenon called graphoepitaxy growth (see the above-mentioned documents 6, 7, and 8). By the heteroepitaxial growth described above, a single-crystal silicon layer 7 with higher crystallinity can be obtained.
- FIG. 10A when a vertical wall is formed on the amorphous substrate (glass) 1 to form the step 4, and an epitaxy layer is formed thereon, the run as shown in FIG. As shown in FIG. 10B, the crystal orientation of the (100) plane grows along the plane of the step 4 as shown in FIG. 10B.
- the size of this single crystal grain increases in proportion to the temperature and time, but when the temperature is lowered and the time is shortened, the interval between the steps must be shortened.
- the crystal orientation of the growth layer can be controlled by changing the shape of the steps to various values as shown in FIGS. 11 to 11F.
- the (100) plane is most often used.
- the cross-sectional shape of the step 4 may be such that the angle of the bottom corner (base angle) may be a right angle or may be inclined inward or outward from the upper end to the lower end, and the surface in a specific direction where crystal growth is likely to occur. It is sufficient if it has.
- the bottom angle of the step 4 is desirably a right angle or 90 ° or less, and the corner of the bottom surface preferably has a slight curvature.
- a monocrystalline silicon layer 7 is formed on the substrate 1 by graphepitaxial growth, and then the MOS transistor using the single crystal silicon layer 7 as a channel region is formed. (TFT).
- a gate oxide film 8 having a thickness of 350 is formed on the surface of the single crystal silicon layer 7 by an oxidation treatment (950 ° C.).
- the P-channel MO transistor section is masked with a photo resist 9 to control the impurity concentration in the channel region for the N-channel MOS transistor and the P-type impurity.
- Ions (eg, B +) 10 are implanted at, for example, 10 kV with a dose of 2.7 ⁇ 10 11 atoms Zcm 2 , and the conductivity type of the single-crystal silicon layer 7 is P-shaped. Set to 1.
- the N-channel MOS transistor portion is masked with a photo-resist 12 to form an N-type MOS transistor.
- Impurity ions (for example, P +) 13 are implanted at a dose of 1 ⁇ 10 11 atoms / cm 2 at 10 kV, for example, to form a single-crystal silicon layer 14 that compensates for the P-type of the single-crystal silicon layer 7. I do.
- the phosphorus-doped polycrystalline silicon layer 15 as a gate electrode material is reduced to a thickness of 400 by, for example, a CVD method (temperature: 620 ° C.). Deposit.
- the photoresist 16 is Then, using this as a mask, the polycrystalline silicon layer 15 is patterned in the shape of a gate electrode.
- the surface of the gate polycrystalline silicon layer 15 is oxidized at, for example, 900 ° C. for 60 minutes in O 2. An oxide film is formed on the substrate.
- the P-channel MOS transistor portion is masked with a photoresist 18 and N-type impurities, for example, As + ions 19 are applied at 20 kV, for example.
- N-type impurities for example, As + ions 19 are applied at 20 kV, for example.
- X ions are implanted at a dose of 10 15 atoms / cm 2 , and anneal in N 2 is performed at 950 for 40 minutes, so that the N + source region 20 and the drain region of the N channel MOS transistor are formed. 2 1 is formed respectively.
- the N-channel MO transistor portion is masked with a photoresist 22 to remove P-type impurities, for example, B + ions 23 at, for example, 10 ⁇ 10 15 at 10 kV.
- Ion implantation is performed at a dose of 0 ms Z cm 2 , and P-shaped source region 24 and drain region 25 of a P-channel MOS transistor are formed by annealing in N 2 at 900 C for 5 minutes, respectively. I do.
- the BPSG film 28 is reflowed in N 2 at a temperature of, for example, 900 ° C.
- a contact window is opened at a predetermined position of the insulating film, and an electrode material such as aluminum is applied to the entire surface including each hole by sputtering or the like at 150 ° C. for 1 m.
- the source or drain electrode 29 (S or D) and the gate extraction electrode or wiring 30 (G) of each of the P-channel MOS TFT and the N-channel MO STFT are patterned. To complete each MOS transistor.
- the step 4 is provided on the insulating substrate 1, so that the operation and effect obtained by the first embodiment are further improved, and the epitaxial growth of single crystal silicon having high crystallinity is favorably performed. be able to.
- an insulating substrate provided with a crystalline sapphire layer is used as the substrate.
- a single-crystal silicon substrate (or a silicon wafer) is used.
- a single-crystal silicon layer is epitaxially grown thereon by the above-mentioned catalytic CVD method.
- a silicon epitaxial layer is formed at a low temperature to a thickness of, for example, 1.2 im by a catalytic CVD method using a catalytic CVD apparatus (FIG. 5). It can be formed by the process described.
- the silicon wafer is washed, the thin oxide film on the surface is removed with dilute hydrofluoric acid (1 to 5% aqueous solution), and then washed and dried with pure water.
- the silicon wafer is transferred via the load lock chamber to a support (usually a SiC-coated graphite susceptor, temperature of 200 ° C) that can control the temperature in the chamber of the catalytic CVD device (Fig. 5). ) Mount on top.
- Chamber pressure about 0.1 to 15 Pa (here set to 1.0 Pa)
- Susceptor temperature 200 to 600 ° C (here set to 200 ° C)
- Hydrogen flow rate Set to 90 s ccm / min.
- the temperature of the catalyst body (for example, a thin tungsten wire) is raised to, for example, about 160 to 180 ° C. (here, 180 ° C.), and this state is maintained for 10 minutes.
- the high-energy hydrogen atoms or a group of atoms activated by the high-temperature metal catalyst are formed on the silicon wafer in a thin (thickness of 15 to 18) because the silicon oxide film is etched at a low temperature.
- the natural oxide film can be removed by etching at a low temperature.
- the etching rate of the silicon oxide film formed at a high temperature was confirmed to be about 15 to 20 A / 20 minutes at 200 ° C., so that the above-mentioned natural oxide film was completely removed. Removed.
- the S i H 4 flow rate to zero, and cut off power supply to the catalyst after 5 minutes, lowering the temperature. Then the hydrogen flow rate to zero, the pressure was reduced to about 1 ⁇ 2 X 1 0- 6 P a, in particular for exhausting the S i H 4 was introduced into the Chiyanba (about 5 minutes). Thereafter, the wafer is taken out of the atmosphere through the load lock chamber.
- the single crystal silicon layer can be epitaxially grown on the sapphire substrate by the same process as described above.
- the thickness of the single-crystal silicon layer is set to 0.1 m, and the above-mentioned reaction gas is supplied for 166 seconds.
- FIGS. 12 to 14 a fourth embodiment of the present invention will be described.
- This embodiment performs the same operation as described in the third embodiment,
- the obtained shi This figure shows examples of the comparison with the presence or absence of a natural oxide film, including a reconepitaxial layer, and the case of using a bulk sapphire wafer as a substrate (for SOS (Silicon on Sapphire) etc.).
- Samples 14 and 5 were subjected to hydrogen treatment for removing natural oxide films before silicon epitaxial growth.
- Catalyst temperature 1650 to 1700 ° C (about 1500 W)
- Substrate holder temperature 200 ⁇ 280 ° C
- Catalyst body dimensions 0.4 mmO
- Substrate holder temperature 200 ° C
- Substrate holder temperature 200 ° C
- the single-crystal silicon layer in many regions consists of twins with the exact same orientation as the substrate or with the substrate (1 1 1) plane as the plane of symmetry. It consists of a crystal with a (111) plane in the same orientation as the substrate (111) plane. However, it does not have the same crystallographic orientation as the substrate (1 1 1). It includes a twin structure and a slight polycrystalline structure.
- the single-crystal silicon layer is crystal-grown under the influence of the crystal orientation of the substrate Si, and in many regions, the (111) plane has the same orientation as the substrate (111) plane. It consists of a crystal with.
- the film consists of columnar structures that extend almost perpendicular to the substrate, with individual "pillars" (grains) formed by stacking (111) twin structures.
- Sample 1 uses a silicon substrate with (100) 0 ° o ⁇ ⁇ and a natural oxide film (about 18 people). This natural oxide film is removed by catalytic active hydrogen treatment. You can see that there is. It can be clearly seen that the formed single crystal silicon layer is coordinated at (100) 0 ° 0 ° similarly to the substrate. Also, it has a surface condition as clean as a single crystal silicon substrate.
- the single crystal silicon layer of the sample 14 forms a columnar structure composed of a stack of Si (100) twin structures.
- the crystal grows continuously and cleanly with good consistency with the substrate Si crystal, and the substrate holder—epitaxial growth occurs even at a low temperature of 200 ° C. It is clear that. However, epitaxial growth does not occur on the entire Si substrate, but occurs in a dense area of several nm on the substrate surface. It is considered that a columnar structure was formed for this reason. In the area where no epitaxial growth has occurred, an island-like interface, which seems to be an amorphous layer, is observed.
- the obtained single-crystal silicon layer is not a perfect single-crystal thin film but has a portion where defects are visible. This is the reaction gas This is probably because oxygen and moisture were mixed in the gas and oxygen was precipitated near the grain boundary.
- the formed single crystal silicon layer is coordinated at (110) 0 °. Also, it has a surface condition as clean as a commercially available SOS substrate.
- the above-mentioned hydrogen treatment prior to the deposition of single-crystal silicon removes the strain on the substrate and the attached contaminants (organic substances, oxides, etc.) and exposes the ideal sapphire crystal layer. With this, the epitaxial growth of the single crystal silicon layer is favorably performed.
- the base of the epitaxial growth of single crystal silicon may be a single crystal silicon layer instead of the above-described crystalline sapphire layer or the like.
- a substrate having an SOI (Sil icon on insulator) structure can be used, on which single crystal silicon can be further epitaxially grown.
- the bulk of the same material is not limited to the case of epitaxial growth on a thin film that has good lattice matching with single crystal silicon like these thin films (the above-mentioned single crystal semiconductor such as sapphire wafer, silicon wafer, and germanium wafer). Epitaxial growth on top is also possible.
- the step 4 described above can be formed not only on the substrate 1 but also on the sapphire layer or the sapphire substrate itself having a thickness indicated by a virtual line in FIG. 6A.
- a single crystal silicon layer is deposited by a catalytic CVD method using a material layer or a single crystal silicon substrate having good lattice matching with single crystal silicon. Since the above-mentioned material layer can be formed at a low temperature, and the heat treatment temperature at the time of silicon epitaxial growth can be a low temperature, a single crystal silicon layer can be uniformly formed at a low temperature.
- a glass substrate, a ceramic substrate, a single crystal silicon substrate, or the like having a relatively low strain point can be easily obtained, and a substrate with low cost and good physical properties can be used.
- the plate can be made larger.
- the material layer such as the crystalline sapphire layer serves as a diffusion barrier for various atoms, so that diffusion of impurities from the glass substrate can be suppressed.
- the electron mobility of the single-crystal silicon layer is 540 cm 2 ⁇ ⁇ sec, which is as large as that of a single-crystal silicon substrate.
- Semiconductor elements such as diodes, capacitors, and resistors, or electronic circuits in which these elements are integrated, can be formed on a glass substrate or the like.
- single-crystal silicon can be grown at a low temperature, auto-doping of impurities can be prevented, and the process can be simplified (that is, a process of sealing the back surface of a high-concentration substrate is not required).
- the process can be simplified (that is, a process of sealing the back surface of a high-concentration substrate is not required).
- the amount of diffusion of impurities is reduced, the quality of the silicon epitaxial layer can be improved.
- the substrate temperature is low, the heating power source requires low power, and the cooling mechanism is simplified, so that the silicon epitaxial device is inexpensive.
- the reaction efficiency of the reaction gas such as silane is high, the load on the environment is reduced while saving resources, and the cost can be reduced. Industrial applicability
- the silicon layer can be epitaxially grown uniformly at a low temperature. Accordingly, a semiconductor device having a high current density at a high speed can be manufactured.
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- Metallurgy (AREA)
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- Thin Film Transistor (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99926854A EP1018758A4 (en) | 1998-06-30 | 1999-06-30 | METHOD FOR PRODUCING A MONOCRISTALLINE SILICONE LAYER AND A SEMICONDUCTOR ARRANGEMENT |
| KR1020007002049A KR20010023407A (ko) | 1998-06-30 | 1999-06-30 | 단결정 실리콘층의 형성 방법 및 반도체 장치의 제조방법, 및 반도체 장치 |
| US09/486,619 US6399429B1 (en) | 1998-06-30 | 1999-06-30 | Method of forming monocrystalline silicon layer, method for manufacturing semiconductor device, and semiconductor device |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10/184468 | 1998-06-30 | ||
| JP18446898 | 1998-06-30 | ||
| JP11/8511 | 1999-01-14 | ||
| JP11008511A JP2000223419A (ja) | 1998-06-30 | 1999-01-14 | 単結晶シリコン層の形成方法及び半導体装置の製造方法、並びに半導体装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000001005A1 true WO2000001005A1 (en) | 2000-01-06 |
Family
ID=26343040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1999/003522 Ceased WO2000001005A1 (en) | 1998-06-30 | 1999-06-30 | Method for forming monocrystalline silicon layer, method for manufacturing semiconductor device, and semiconductor device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6399429B1 (ja) |
| EP (1) | EP1018758A4 (ja) |
| JP (1) | JP2000223419A (ja) |
| KR (1) | KR20010023407A (ja) |
| WO (1) | WO2000001005A1 (ja) |
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| RU2185685C2 (ru) * | 2000-06-23 | 2002-07-20 | Научно-исследовательский институт измерительных систем | Способ обработки структур "кремний на сапфире" |
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| JP2008270572A (ja) | 2007-04-20 | 2008-11-06 | Sanyo Electric Co Ltd | 光起電力素子の製造方法 |
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- 1999-01-14 JP JP11008511A patent/JP2000223419A/ja active Pending
- 1999-06-30 EP EP99926854A patent/EP1018758A4/en not_active Withdrawn
- 1999-06-30 WO PCT/JP1999/003522 patent/WO2000001005A1/ja not_active Ceased
- 1999-06-30 KR KR1020007002049A patent/KR20010023407A/ko not_active Ceased
- 1999-06-30 US US09/486,619 patent/US6399429B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6340314A (ja) * | 1986-08-05 | 1988-02-20 | Hiroshima Univ | 触媒cvd法による薄膜の製造法とその装置 |
| JPH08250438A (ja) * | 1995-03-15 | 1996-09-27 | Res Dev Corp Of Japan | 触媒cvd法によるシリコン薄膜の生成方法および薄膜トランジスタの製造方法および薄膜トランジスタ |
| JPH0950960A (ja) * | 1995-08-04 | 1997-02-18 | Semiconductor Energy Lab Co Ltd | 結晶性半導体作製方法 |
| JPH09129558A (ja) * | 1995-10-30 | 1997-05-16 | Nec Corp | 半導体装置の製造方法 |
| JPH10167893A (ja) * | 1996-12-05 | 1998-06-23 | Sony Corp | 量子細線の製造方法 |
Non-Patent Citations (1)
| Title |
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| See also references of EP1018758A4 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2185685C2 (ru) * | 2000-06-23 | 2002-07-20 | Научно-исследовательский институт измерительных систем | Способ обработки структур "кремний на сапфире" |
| WO2014037480A1 (en) | 2012-09-10 | 2014-03-13 | F. Hoffmann-La Roche Ag | 6-amino acid heteroaryldihydropyrimidines for the treatment and prophylaxis of hepatitis b virus infection |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010023407A (ko) | 2001-03-26 |
| JP2000223419A (ja) | 2000-08-11 |
| EP1018758A1 (en) | 2000-07-12 |
| US6399429B1 (en) | 2002-06-04 |
| EP1018758A4 (en) | 2002-01-02 |
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