WO2009151133A1 - 窒素化合物半導体基板の製造方法および窒素化合物半導体基板、単結晶SiC基板の製造方法および単結晶SiC基板 - Google Patents
窒素化合物半導体基板の製造方法および窒素化合物半導体基板、単結晶SiC基板の製造方法および単結晶SiC基板 Download PDFInfo
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- H01L21/8213—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using SiC technology
Definitions
- the present invention relates to a method for manufacturing a nitride compound semiconductor substrate which is a semiconductor substrate with an insulating layer embedded type, a nitrogen compound semiconductor substrate obtained by the method, and a single crystal Si C substrate which is a semiconductor substrate with an insulating layer embedded type.
- the present invention relates to a method of manufacturing the same and a single crystal SiC substrate obtained by the method.
- Nitrogen compounds such as gallium nitride and aluminum nitride are direct transition type gap-gap semiconductors, and they are superior to dielectric semiconductors in breakdown electric field, saturated electron velocity, and chemical stability. It attracts attention as a next-generation light emitting device and semiconductor device material.
- a silicon-on-insulator (SOI) substrate with a buried insulating layer is excellent in achieving high-speed circuits and low power consumption, and is considered promising as a next-generation LSI substrate. Therefore, insulating layer embedded type nitride compound semiconductor substrates combining these two features are very promising as semiconductor device materials.
- the main reason for using a silicon carbide crystal as a base substrate for a nitrogen compound semiconductor is the difference between silicon carbide and a nitrogen compound semiconductor. Mismatch dislocations occur at the interface between the nitride compound semiconductor and the nitride compound semiconductor if the lattice constant mismatch is relatively small and the nitride compound semiconductor is epitaxially grown directly on the surface silicon layer of the SOI substrate. It is because it is possible to suppress.
- the lattice constant mismatch between the gallium nitride crystal and sapphire silicon conventionally used as the underlying substrate is about 16% and about 20%, respectively.
- the mismatch between the lattice constants of gallium nitride and silicon carbide is about 3.5%, which is significantly smaller than that of sapphire and silicon.
- a silicon carbide substrate having a buried oxide film is manufactured by carbonizing the surface silicon film of the SOI substrate and modifying it into a silicon carbide layer.
- a method for epitaxial growth of the um layer has been proposed (for example, Patent Documents 1 and 2 below).
- the silicon substrate on the surface of the SOI substrate is carbonized and denatured into a silicon carbide layer, whereby the SiC substrate having the buried insulating layer can be easily manufactured while realizing a large aperture with cost advantage.
- the method described in Patent Document 3 below has been proposed.
- This method is manufactured using an SOI substrate (insulating layer embedded type Si substrate) having a surface silicon layer of a predetermined thickness and a buried insulating layer (SiO 2 layer). That is, the surface S i layer of the SOI substrate is thinned to about 10 nm, and this is heat-treated for a predetermined time in a heating furnace of a mixed gas atmosphere of hydrogen gas and hydrocarbon-based gas.
- the surface silicon layer is carbonized at a high temperature to transform it into a single crystal SiC thin film, and the Si crystal layer is grown by an epitaxial method using the single crystal SiC thin film as a seed layer.
- single crystal S i C silicon carbide
- SOI substrates with a buried insulating layer are excellent in achieving faster circuits and lower power consumption, and are considered promising as next-generation LSI substrates. Therefore, an insulating layer embedded semiconductor SiC substrate combining these two features is very promising as a semiconductor device material.
- This method is manufactured using an SOI substrate (insulating layer embedded type Si substrate) having a surface silicon layer of a predetermined thickness and a buried insulating layer (SiO 2 layer). That is, the surface Si layer of the SOI substrate is thinned to about 10 nm, which is heat-treated in a heating furnace of a mixed gas atmosphere of hydrogen gas and hydrocarbon gas for a predetermined time to obtain the surface silicon layer.
- the carbon is carbonized at a high temperature to transform it into a single crystal SiC thin film, and the SiC single crystal thin film is used as a seed layer to grow a SiC layer by an epitaxial method.
- the “wave” of such an interface sometimes exceeds 10 nm, resulting in variations in the thickness of the SiC layer, and the “wave” of the formed Sic thin film itself. It is expected to become a major problem when used as a semiconductor device.
- the Si C layer is epitaxially grown on the Si C thin film in the presence of the interface and the Si C thin film itself, the crystallinity of the grown S ic layer itself is significantly increased. In addition to deterioration, there is also the problem that the surface condition tends to be rough.
- Patent Document 4 Japanese Patent Application Laid-Open No. 10- 2 8 7 4 9 7
- Patent Document 2 Japanese Patent Application Laid-Open No. 8-2 3 6 4 5
- Patent Document 3 Japanese Patent Application Laid-Open No. 200003-2 2 4 2 4 8
- Patent Document 4 Japanese Patent Application Laid-Open No. 2000-0526 Patent Disclosure
- the “wave” of such an interface sometimes exceeds 10 nm, resulting in variations in the thickness of the SiC layer, and the “wave” of the formed Sic thin film itself. It is expected to become a major problem when used as a semiconductor device.
- the Si C layer is epitaxially grown on the Si C thin film in the presence of the interface and the Si C thin film itself, the crystallinity of the grown Si C layer itself is significantly increased.
- the surface condition tends to be rough.
- the crystallinity of the nitride semiconductor to be epitaxially grown on the above Si C layer is also degraded as the Si C layer is undulated and the crystallinity is lowered.
- the present invention has been made in view of the above circumstances, and a nitrogen compound semiconductor layer having good crystallinity can be obtained, and a method for producing a nitrogen compound semiconductor substrate having low productivity and good productivity can be obtained.
- the purpose is to provide the above-mentioned nitrogen compound semiconductor substrate.
- the present invention has been made in view of the circumstances as described above, S i C layer and S i O 2, etc. S i C layer interface and in the uniform state has good crystallinity the buried insulating layer It is an object of the present invention to provide a method for producing a single crystal SiC substrate which is low in cost and high in productivity, and a single crystal SiC substrate obtained by the method.
- a method of manufacturing a nitrogen compound semiconductor substrate comprises the steps of: preparing a Si substrate having a surface Si layer of a predetermined thickness and a buried insulating layer; A step of leaving the Si layer in the vicinity of the interface with the buried insulating layer as a residual Si layer when the surface si layer is transformed into a single crystal Si C layer by heating in a gas atmosphere;
- the subject matter of the present invention is to further perform a step of epitaxially growing a nitrogen compound semiconductor on SiC.
- a single crystal Si C layer is formed on the surface side of the buried insulating layer of the single crystal Si substrate having a buried insulating layer,
- the gist is that a Si layer is formed in the vicinity of the interface between the SiC layer and the buried insulating layer, and a nitrogen compound semiconductor layer is formed on the single crystal SiC layer.
- a method of manufacturing a single crystal SiC substrate comprises: preparing a Si substrate having a surface Si layer of a predetermined thickness and a buried insulating layer; A method for producing a single-crystal Si substrate, wherein the surface Si layer is transformed into a single-crystal SiC layer by heating in a gas atmosphere, the surface Si layer being transformed into a single-crystal SiC layer. In this case, it is important to leave the Si layer near the interface with the buried insulating layer as the remaining Si layer.
- a single crystal SiC layer is formed on the surface side of the embedded insulating layer of the single crystal Si substrate having the embedded insulating layer.
- a summary of the present invention is a single crystal SiC substrate, wherein the Si layer is formed in the vicinity of the interface between the single crystal SiC layer and the buried insulating layer. Effect of the invention That is, in the method for producing a nitrogen compound semiconductor substrate according to the present invention, when transforming the surface si layer into a single crystal Si C layer, leaving the Si layer near the interface with the buried insulating layer as a residual Si layer.
- the flatness of the interface with the underlying buried insulating layer is greatly improved, and the “wave” of the interface can be significantly reduced.
- the flatness of the interface between the buried insulating layer and the remaining Si layer is improved, it occurs in the single crystal Si C layer itself formed on the surface.
- the “swelling” is also significantly reduced. As described above, since a single crystal si C layer with less waviness is formed, the crystallinity of the nitrogen compound semiconductor formed by the epitaxial growth is also greatly improved, and the performance as a semiconductor device is greatly improved. Let And, since it does not depend on ion implantation etc., the above-mentioned nitrogen compound semiconductor substrate as a high quality semiconductor device can be manufactured at low cost and with high productivity.
- a single crystal SiC is further epitaxially grown on the modified single crystal SiC layer, and a nitrogen compound semiconductor is formed on the epitaxial crystal grown single crystal SiC.
- the epitaxial growth is performed, the epitaxial growth is performed on the Si crystal layer to be grown when the Si crystal is formed by the epitaxial growth further on the upper layer of the single crystal SiC layer.
- the crystallinity of the nitrogen compound semiconductor also becomes good, and a favorable nitrogen compound semiconductor device can be obtained.
- the thickness of the remaining Si layer is 3 to 20 nm
- the effect of improving the flatness of the interface between the buried insulating layer and the remaining Si layer and the single crystal Si layer itself is obtained.
- almost no defects such as voids occur in the lower layer of the single crystal SiC layer.
- a good nitride compound semiconductor device can be obtained.
- the S i layer in the vicinity of the interface with the embedded insulating layer remains By leaving it as a Si layer, the flatness of the interface with the underlying buried insulating layer can be greatly improved, and the “wave” of the interface can be significantly reduced. As described above, the flatness of the interface between the buried insulating layer and the remaining Si layer is improved, so that the “waviness” generated in the single crystal SiC layer itself formed on the surface is also largely reduced.
- the formation of a single crystal SiC layer with less waviness greatly improves the crystallinity of the nitrogen compound semiconductor formed by the epitaxial growth, and the performance as a semiconductor device is significantly improved. Improve. Further, since the above-described high-quality semiconductor device can be manufactured at low cost and with high productivity, since it does not depend on ion implantation or the like. That is, in the method for producing a single crystal SiC substrate according to the present invention, when transforming the surface Si layer into a single crystal SiC layer, the residual Si layer in the vicinity of the interface with the buried insulating layer is Si layer.
- the flatness of the interface with the underlying buried insulating layer can be greatly improved, and the “wave” of the interface can be made much smaller. Since the flatness of the interface between the buried insulating layer and the remaining Si layer is improved, the “waviness” generated in the single crystal Si C layer formed on the surface is also significantly reduced. As described above, the formation of a single crystal SiC layer with a low degree of waviness greatly improves the performance as a semiconductor device. And since it does not depend on ion implantation etc., it is possible to manufacture the above-mentioned high quality single crystal SiC substrate at low cost and with high productivity.
- epitaxial growth is performed on a single crystal Si substrate in which a remaining Si layer is left in the vicinity of the interface with the buried insulating layer, thereby forming a single crystal on top of the single crystal Si layer on the surface.
- the crystallinity of the growing S i C is thus improved even when the S i C is further formed on the upper layer of the single crystal S i C layer by epitaxial growth. The As a result, it is possible to obtain a clean single crystal and a uniform thickness S i C.
- the thickness of the remaining Si layer is 3 to 20 nm, the effect of improving the flatness of the interface between the buried insulating layer and the remaining Si layer and the single crystal Si layer itself is obtained. As well as being sufficiently obtained, defects such as a void are hardly generated in the lower layer of the single crystal SiC layer, and a good semiconductor device can be obtained.
- the single crystal SiC substrate of the present invention since the Si layer is formed in the vicinity of the interface between the single crystal SiC layer and the embedded insulating layer, the single crystal SiC substrate of the present invention The flatness of the interface is greatly improved, and the “wave” of the interface can be significantly reduced. Since the flatness at the interface between the buried insulating layer and the remaining Si layer is improved, the “waviness” generated in the single crystal Si C layer formed on the surface is also significantly reduced. As described above, the formation of a single crystal SiC layer with a low degree of waviness greatly improves the performance as a semiconductor device. Brief description of the drawings
- FIG. 1 is a view showing a method of manufacturing a nitrogen compound semiconductor substrate according to an embodiment of the present invention.
- FIG. 2 is a view showing an apparatus used for the method of manufacturing the above-mentioned nitrogen compound semiconductor substrate.
- FIG. 3 is a view showing a method of manufacturing a nitrogen compound semiconductor substrate according to a second embodiment of the present invention.
- FIG. 4 is a cross-sectional TEM image of a sample immediately after the formation of a single crystal Si C layer in the production method of Comparative Example 1 using the S O I — R e f as the starting material.
- FIG. 5 is a cross-sectional TEM image of a sample immediately after the formation of a single crystal SiC layer in the production method of Example 1 using the SOI-A as a starting material.
- FIG. 6 is a cross-sectional TEM image of a sample immediately after the formation of a silicon epitaxial layer according to the method of Example 2 using SOI-A as a starting material.
- FIG. 7 is a cross-sectional TEM image of a sample after formation of a G a N epitaxial layer according to the method of Example 2 using S O I-A as a starting material.
- FIG. 8 is a view showing a method of manufacturing a single crystal SiC substrate according to an embodiment of the present invention.
- FIG. 9 is a view showing an apparatus used for the method of manufacturing the single crystal SiC substrate.
- FIG. 10 is a cross-sectional TEM image of a single-crystal Si C layer (seed layer) according to the manufacturing method of Comparative Example 1 using as a starting material the 0 S O I — R e f.
- FIG. 1 is a cross-sectional TEM image of a single-crystal Si C layer (seed layer) according to the method of Example 1 using 1 S O I-A as a starting material.
- FIG. 12 is a cross-sectional TEM image of a single-crystal S i C epitaxial layer according to the method of Example 2 using 2 S O I 1 A as a starting material. Explanation of sign
- FIG. 1 is a view showing an embodiment of a method for producing a nitrogen compound semiconductor substrate of the present invention.
- a Si substrate 1 having a surface Si layer 3 of a predetermined thickness and a buried insulating layer 4 is prepared, and the thickness of the surface Si layer 3 of the Si substrate 1 is prepared. 6 ⁇ ⁇ ! Thin film to about 40 nm (Fig. 1 (A)).
- the surface Si layer 3 is transformed into a single crystal Si C layer 6 by heating the Si substrate 1 in a carbon-based gas atmosphere (FIG. 1 (B)).
- the Si layer near the interface 8 with the buried insulating layer 4 is left as the remaining Si layer 5.
- the single crystal Si C epitaxial layer 7 is grown by epitaxial growth using the single crystal Si C layer 6 as a seed layer (FIG. 1 (C)).
- a nitrogen compound semiconductor layer 15 is formed by epitaxial growth on the single crystal epitaxial Si C layer 7 formed by the above-mentioned epitaxial growth.
- the Si substrate 1 is a buried insulating layer 4 in the vicinity of the surface of the Si base material 2.
- a SiO 2 layer of a predetermined thickness is formed, and a surface Si layer 3 of a predetermined thickness is formed on the surface.
- the thickness of the buried insulating layer 4 is set to be about 1 to 200 nm.
- the surface Si layer 3 of the Si substrate 1 is thinned and thinned.
- This thinning can be performed, for example, by heating the Si substrate 1 in an oxidizing atmosphere to leave a Si layer of a desired thickness in the vicinity of the interface 8 with the embedded insulating layer 4.
- the oxide layer 9 on the surface is removed by etching with hydrofluoric acid or the like, and the desired thickness of S left near the interface 8 is obtained.
- Thinning is performed by exposing the i layer.
- the thickness of the thinned surface S i layer 3 is preferably set to about 6 nm to 40 nm, and more preferably 8 8 ⁇ ! It is about 3 to 30 nm, and more preferably 1 0 ⁇ ⁇ ! It is about 2 to 7 nm.
- the thickness of the thinned surface S i layer 3 is less than 6 nm, the residual S i layer 5 having a sufficient thickness can not be left by the subsequent transformation step, and the primary single crystal S i C layer having a sufficient thickness. 6 can not be generated.
- the thickness of the surface S i layer 3 having a thickness of more than 40 nm exceeds 40 nm, it takes time for the modification treatment described later, or the thickness of the remaining S i layer 5 becomes too thick. This is because defects such as a boyid are likely to occur in the vicinity.
- the thickness of the surface Si layer 3 after thinning is adjusted by adjusting the oxidation treatment conditions such as the atmosphere, temperature, and time when the oxide layer 9 is formed by heat treating the Si substrate 1 in an oxidizing atmosphere,
- the thickness can be set by adjusting the thickness of the oxide layer 9 to be formed with respect to the thickness of the original surface S i layer 3.
- the surface Si layer 3 is transformed into a single crystal Si C layer 6 by heating the Si substrate 1 in a carbon-based gas atmosphere.
- the above transformation step is performed, for example, by an apparatus shown in FIG.
- This apparatus comprises: a heating furnace 10 having a heater 11; and bombes 13 and 14 for storing atmosphere gases (hydrogen gas G 1 and hydrocarbon gas G 2) introduced into the heating furnace 10; Is equipped.
- a mixer 12 mixes hydrogen gas G 1 and hydrocarbon gas G 2 and supplies the mixed gas as a mixed gas to the heating furnace 10.
- the above Si substrate 1 is installed in the heating furnace 10 by the above apparatus, and mixed gas (G 1 + G 2) of hydrogen gas G 1 and hydrocarbon gas G 2 is supplied in the heating furnace 10. While the ambient temperature in the heating furnace 10 is raised, the surface Si layer 3 of the Si substrate 1 is transformed into a single crystal Si C layer 6.
- the Si substrate 1 is placed in the heating furnace 10, and mixed in the heating furnace 10 with the hydrogen gas G 1 mixed with the hydrocarbon gas G 2 at a ratio of 1% by volume.
- the atmosphere temperature in the heating furnace 10 is 500 ° C. to less than the melting point of silicon, preferably 120 ° to 14 °. Heat to 0 5 ° C.
- the surface Si layer 3 of the Si substrate 1 is transformed into a single crystal Si c layer 6.
- the hydrogen gas G 1 is a carrier gas, and for example, propane gas is used as the hydrocarbon gas G 2.
- the supply amount of hydrogen gas G 1 from bomb 13 is 100 cc
- the supply amount of hydrocarbon gas G 2 from bomb 14 is 10 cc Z min. Do.
- the thickness of the single crystal Si C layer 6 is preferably set to about 3 nm to 20 nm in order to reduce defects in the same layer and to suppress three-dimensional growth, more preferably 4 n ⁇ ! It is about ⁇ 10 nm, and more preferably about 5 nm ⁇ 7 nm.
- the surface S i layer 3 and the embedded insulating layer 4 in the surface S i layer 3 It is performed to leave the remaining Si layer 5 in the vicinity of the interface 8 of the
- the thickness of the residual Si layer 5 is preferably set to 3 to 20 nm, and more preferably 3 to 17 nm. If the thickness of the residual Si layer 5 is less than 3 nm, the effect of improving the flatness of the interface 8 between the residual Si layer 5 and the buried insulating layer 4 is poor, and the thickness of the residual Si layer 5 is 2 0 If it exceeds nm, defects such as a void are likely to occur in the vicinity of the interface 8.
- the thickness of the remaining Si layer 5 is a single crystal Si C layer formed with respect to the thickness of the surface Si layer 3 when the film is thinned by adjusting the conditions such as the atmosphere of the modification treatment, the temperature, and the time. It can be set by adjusting the thickness of 6.
- the above steps are performed in excess to deposit the single crystal Si C layer 6 on the single crystal Si C layer 6.
- a carbon thin film is deposited on the single-crystal SiC layer 6 by performing the above-described steps in excess (for example, continuing for several minutes to several hours).
- a single crystal SiC is grown by epitaxial growth using the single crystal SiC layer 6 as a seed layer, and a single crystal Si epitaxial layer 7 is deposited.
- a single crystal SiC can be grown under the following conditions. That is, the Si substrate 1 on which the single crystal Si C layer 6 is formed is disposed in the processing chamber 1, and a monomethylsilane or silane and a hydrocarbon system such as a vacuum pan are disposed in the processing chamber 1.
- the temperature is 500 ° C. to less than the melting point of silicon, preferably 800 ° C., while supplying the source gas contained therein at a gas flow rate of about 1 to 1000 secm under a pressure not higher than atmospheric pressure.
- By treating at about 140 ° C. it is possible to grow single crystal Si C by epitaxial growth using the single crystal Si C layer 6 as a seed layer.
- a part of Si constituting the S i C embedded buried insulating layer 4 (S i O 2 ) formed by the above-mentioned modification-processed epitaxial growth is a part 2 of co 2 at the time of high temperature sublimation. It is thought that. Further, when exposed to a high temperature in a state where S i C and S i O 2 are in contact, considered you mutual modification between S i C and S i O 2.
- the Si C layer 6 is composed of Si c partially or denatured S i O 2, S i O 2 constituting the insulating layer 4 embedded in the opposite - part is going to be or denatured S i C, consequently, the single crystal S i It is considered that the flatness of the interface between the C layer 6 and the buried insulating layer 4 is broken and appears as "waviness".
- a residual Si layer 5 of appropriate thickness is present between the single crystal Si C layer 6 and the buried insulating layer 4 (Si 2 O 3 ). It is S i C and S i O 2 and mutual degeneration prevented such is considered that flatness of the interface 8 between the residual presence S i layer 5 and the embedded insulating layer 4 is maintained.
- the presence of the residual Si layer 5 prevents the defect from reaching the buried insulating layer 4 and prevents sublimation of Si, and residual Si i It is considered that the flatness of the interface 8 between the layer 5 and the buried insulating layer 4 is maintained.
- the thickness of the single crystal Si C layer 6 obtained by the modification treatment is also planarized, and it is thought that the crystal faces become aligned. Be Then, even when a single crystal SiC is grown by epitaxial growth thereafter, the crystallinity of the aligned SiC is maintained, so the single crystal is much cleaner than before, and the film thickness is A uniform single crystal S i C epitaxial layer 7 can be obtained.
- FIG. 1 (D) the above single crystal Si C epitaxal A nitride compound semiconductor layer 15 is deposited on the layer 7 by epitaxial growth.
- the epitaxial growth of the nitrogen compound semiconductor layer 15 can be performed, for example, under the following conditions. That is, the Si substrate 1 on which the single crystal Si C epitaxial layer 7 is formed is disposed in the processing chamber 1, and the organic A 1 -based gas and / or the organic Ga-based gas is disposed in the processing chamber 1.
- a raw material gas containing ammonia gas is supplied at a gas flow rate of about 100 to 500 sccm under a pressure lower than atmospheric pressure, and the temperature is 500 ° C. to the melting point of silicon.
- the epitaxial layer is preferably grown on the single crystal Si C epitaxial layer 7 by treatment at about 400 to 120 ° C., to form an A 1 N layer, a G a N layer, A 1 It is possible to grow the nitride compound semiconductor layer 15 of any of these G a N layers or the like or a laminated structure of these.
- FIG. 3 shows a second embodiment of the present invention.
- the Si substrate 1 having the buried insulating layer 4 is heated in a carbon-based gas atmosphere to transform the surface Si layer 3 into a single crystal SC layer 6 and then epitaxially grown Si C
- the above-mentioned nitrogen compound semiconductor layer 15 is grown on the single crystal Si C layer 6 by epitaxial growth without the growth of the above.
- the nitrogen compound semiconductor layer 15 is exemplified by any one of the A 1 N layer, the G a N layer, the A 1 G a N layer, or the laminated structure thereof, but the invention is limited thereto. It is intended that various other nitrogen compound semiconductors can be applied.
- the Si layer near the interface 8 with the buried insulating layer 4 remains Si
- the flatness of the interface 8 with the underlying buried insulating layer 4 is greatly improved, and the “wave” of the interface 8 can be made much smaller.
- the flatness of the interface 8 between the buried insulating layer 4 and the remaining Si layer 5 is improved, and therefore, the “waviness” generated in the single crystal Si C layer 6 itself formed on the surface is also significantly Reduced to As described above, since the single crystal SiC layer 6 with less waviness is formed, the crystallinity of the nitrogen compound semiconductor layer 15 formed by the epitaxial growth is also significantly improved, and a semiconductor device is obtained. Significantly improve the performance of And, since it does not depend on ion implantation etc., it is possible to manufacture the nitrogen compound semiconductor substrate as the above-mentioned high quality semiconductor device at low cost and with high productivity.
- a single crystal SiC is further epitaxially grown on the modified single crystal SiC layer 6, and a nitrogen compound semiconductor is epitaxially grown with respect to the single crystal SiC epitaxially grown.
- the Si C is further formed by epitaxial growth on the upper layer of the single crystal Si C layer 6, the crystallinity of the growing Si c is improved, so that the epitaxial growth is performed thereon.
- the crystallinity of the nitrogen compound semiconductor layer 15 also becomes good, and a favorable nitrogen compound semiconductor device can be obtained.
- Example A When the thickness of the remaining Si layer 5 is 3 to 20 nm, the flatness of the interface 8 between the buried insulating layer 4 and the remaining Si layer 5 and the single crystal Si C layer 6 itself is determined. While the improvement effect is sufficiently obtained, almost no defects such as voids occur in the lower layer of the single crystal Si C layer 6. Therefore, a good nitrogen compound semiconductor device can be obtained.
- Example A When the thickness of the remaining Si layer 5 is 3 to 20 nm, the flatness of the interface 8 between the buried insulating layer 4 and the remaining Si layer 5 and the single crystal Si C layer 6 itself is determined. While the improvement effect is sufficiently obtained, almost no defects such as voids occur in the lower layer of the single crystal Si C layer 6. Therefore, a good nitrogen compound semiconductor device can be obtained.
- the surface Si layer 3 was carbonized from the surface side to a silicon layer of 3 to 7 nm and transformed into a single crystal Si C layer 6 (seed layer) of 3 to 7 nm thickness.
- SOI — A, SOI — B, and SOI — C are, respectively, in the lower layer, with a residual Si layer 5 of 3-: L lnm, 9 to 19 nm, approximately 9 9 00 to: L l OO nm. It became the film structure which remained.
- the power supply to the heating heater of the electric furnace was stopped, and at the same time the introduction of the two gases was stopped, while nitrogen at a flow rate of 10 S LM was introduced into the furnace and replaced with the two gases.
- the introduction of nitrogen gas is stopped while maintaining the ambient temperature at 700 ° C, and at the same time oxygen gas with a flow rate of 10 sccm was introduced for 1 hour.
- the introduction of oxygen gas causes excess carbon to adhere to the surface of the sample when siC is produced by the introduction of propane gas, so that the excess carbon reacts with oxygen to generate co 2 , which is effective. In order to remove the excess carbon.
- the introduction of the oxygen was stopped, nitrogen gas with a flow rate of 4 S LM was introduced again, and the wafer was cooled out of the furnace until the entire sample was cooled to a predetermined low temperature, for example, about 80 ° C.
- the wafer is inserted into a decompression epitaxial growth furnace, and approximately 1 ⁇ 10 0
- the wafer is inserted into a vacuum epitaxial growth furnace, and the wafer temperature is 9 8 while introducing 1 sccm of trimethylgallium gas and 1.5 S LM of ammonia gas into the epitaxial growth furnace under a pressure reduction of about 1 torr.
- the temperature was raised to 0 ° C., and the temperature was maintained at this temperature for 75 minutes to deposit a Ga N epitaxial layer of about 300 nm thickness.
- the application of heat to the heating heater of the epitaxial growth furnace is stopped, and at the same time the introduction of trimethylgallium and ammonia gas is stopped, and in this state the entire sample of the electric furnace reaches a predetermined low temperature, for example, about 80 ° C.
- the wafer was cooled out and the wafer was taken out of the furnace.
- Example A 1 Prepare a (111) SI MO X substrate (SOI-R ef) with a surface Si layer 3 thickness of 3 to 7 nm as a starting material, and insert the SOI substrate as a sample into an electric furnace
- the carbonization heat treatment was performed under the same conditions as in Example A 1.
- surface S i layer 3 is completely carbonized and transformed into single crystal S i C layer 6 with a thickness of 3 to 7 nm, and the lower layer portion is in direct contact with buried insulating layer 4.
- the wafer was inserted into a reduced pressure epitaxial growth furnace, and an A 1 N buffer layer of about 3 nm thickness was deposited under the same conditions as Example A 1.
- the wafer was inserted into a vacuum epitaxial growth furnace, and a Ga N epitaxial layer of about 300 nm thickness was deposited under the same conditions as in Example A 1.
- the surface Si layer 3 has a thickness of 10 to 14 nm (1 1 1) SI MO X substrate (SOI _A), and the surface Si layer 3 has a thickness of 1 to 2 2 nm (1 1 1) SI A (1 1 1) bonded SOI substrate (SOI _C) of an MO X substrate (SOI-B) was prepared as a starting material, and a carbonizing heat treatment was performed under the same conditions as in Example A 1.
- the Si layer 3 was carbonized from the surface side to a 3 to 7 nm silicon layer and transformed to a 3 to 7 nm thick single crystal Si C layer 6.
- SOI 1 A, SOI — B, SOI — C has a film structure in which a remaining Si layer 5 of 3 to 11 nm, 9 to: I 9 nm, and approximately 990 to L 10 nm is left in the lower layer portion, respectively.
- the wafer is inserted into a reduced pressure epitaxial growth furnace, and while the monomethylsilane is introduced into the epitaxial growth furnace at 3 sccm under a reduced pressure of about 2 ⁇ 10 ⁇ 4 torr, the wafer temperature is 1 150 ° The temperature is raised to C and held at that temperature for 10 minutes to form a single-crystal Si C epitaxial layer 7 of about 100 nm thickness on the single-crystal Si layer (seed layer) 6. Deposited. After this, the application of heat to the heating heater of the epitaxial growth furnace is stopped, and at the same time the introduction of monomethylsilane gas is stopped.
- the entire sample of the electric furnace is cooled to a predetermined low temperature, for example, 80 ° C. Then, the wafer was taken out of the furnace. Subsequently, the wafer was inserted into a vacuum epitaxial growth reactor, and an A 1 N buffer layer of about 3 nm thickness was deposited under the same conditions as in Example A 1. Subsequently, the wafer was inserted into a reduced pressure epitaxial growth furnace, and a Ga N epitaxial layer of about 300 nm thickness was deposited under the same conditions as Example A 1.
- Example A 2 the wafer was inserted into a vacuum epitaxial growth reactor, and a single crystal Si epitaxial epitaxial layer 7 having a thickness of about 100 nm was deposited under the same conditions as in Example A 2.
- the crucible was inserted into a reduced pressure epitaxial growth furnace, and an A 1 N buffer layer of about 3 nm in thickness was deposited under the same conditions as in Example A 1.
- the wafer was inserted into a reduced pressure epitaxial growth furnace, and a Ga N epitaxial layer of about 300 nm thickness was deposited under the same conditions as Example A 1.
- FIG. 1 A cross-sectional TEM image of the sample immediately after the formation of the single crystal Si C layer 6 (seed layer) in the production method of Comparative Example A 1 using the S O I-R e f as the starting material is shown in FIG.
- a single crystal SiC layer 6 (seed layer) of about 5 nm thickness is formed directly on the buried insulating layer 4, but a large undulation of about 10 nm occurs at the upper interface of the buried insulating layer 4.
- an undulation of about 10 nm was observed in the single crystal SiC layer 6 (seed layer) itself, and apparent SiC orientation sag was observed in the lattice image by the cross-section TEM.
- FIG. 1 A cross-sectional TEM image of a sample immediately after the formation of the single crystal Si C layer 6 (seed layer) in the production method of Example A 1 starting from SOI-A is shown in FIG.
- the remaining Si layer 5 having a thickness of 3 to 3: L 1 nm is left, whereby the buried insulating layer under it is obtained.
- the flatness of the interface 8 with 4 is improved, and the undulation of the interface 8 is reduced by 3 nm. It has been successfully reduced.
- the waviness of the single crystal Si C layer 6 was also suppressed to the level of less than 3 nm which is almost equivalent to the waviness of the interface 8. Also in the lattice image by the cross-sectional TEM, the orientation of S i C was improved as compared to the comparative example.
- the remaining Si layer 5 is also left.
- the flatness of the interface 8 with the underlying buried insulating layer 4 was improved, and the waviness of the interface 8 could be reduced to less than 3 nm.
- improvement in the orientation of S i C was observed compared to the comparative example.
- the waviness of the single crystal Si C layer 6 (seed layer) was also suppressed to a level of less than 3 nm, which is substantially equivalent to the waviness of the interface 8.
- Example A 2 Evaluation of Example A 2 and Comparative Example A 2 immediately after the formation of the S i C epitaxial layer.
- FIG. 6 shows a cross-sectional TEM image of a sample immediately after the formation of an epitaxial layer according to the method of Example A2, in which the starting material is SOI-A.
- An approximately 100 nm thick single-crystal Si epitaxial layer 7 is formed on top of the single-crystal Si layer 6 (seed layer), and the lower Si layer has a 3 to 7 nm thick residual Si layer. 5 are left.
- the good flatness of the buried insulating layer 4 upper interface 8 shown in Example A 1 was maintained even after the Si C epitaxial process was subsequently performed.
- the half width of the SiC (111) peak of the single crystal SiC epitaxial layer 7 according to the production method of Example A2 and Comparative Example A2 was evaluated by the X-ray diffraction rocking curve method. The evaluation results are summarized in Table A2 below.
- the half width of the single crystal S i C epitaxial layer 7 according to Example A 2 is about 70% of the half width of the single crystal S i C epitaxial layer 7 formed on the sample of Comparative Example A 1 under the same conditions. It is confirmed that the crystalline quality of the single crystal Si C epitaxial layer 7 is improved by leaving the remaining Si layer 5 under the single crystal Si C layer 6 (seed layer). .
- FIG. 1 A cross-sectional TEM image of a sample after formation of the G a N epitaxial layer according to the method of Example A 2 starting from S O I — A is shown in FIG.
- a single crystal G a N epitaxial layer of about 30 nm thick is single crystal with a single crystal S i C epitaxial layer 7 of about lOO nm thickness via an A 1 N buffer layer of about 3 nm thickness. It is formed on the top of the SiC layer 6 (Sided layer), and the remaining Si layer 5 of about 7 nm thickness is left in the lower part.
- the good flatness of the buried insulating layer 4 upper interface 8 shown in FIG. 6 was maintained even after the G a N epitaxial process was subsequently performed.
- the half value width of the G a N epitaxial layer according to Example A 1 and A 2 is approximately equal to the half value width of the G a N epitaxial layer formed under the same conditions as above on the sample of Comparative Example A 1 and A 2. It is a value of 70 to 80%, and leaving the remaining Si layer 5 at the bottom of the single crystal Si C layer 6 (seed layer) improves the crystal quality of the Ga N epitaxial layer. confirmed.
- FIG. 8 is a view showing an embodiment of a method for producing a single crystal SiC substrate of the present invention.
- a Si substrate 1 having a surface Si layer 3 of a predetermined thickness and a buried insulating layer 4 is prepared, and the surface Si layer 3 of the Si substrate 1 is prepared. Thickness of 6 6 ⁇ ! Thin film to about 40 nm (Fig. 8 (A)).
- the surface Si layer 3 is transformed into a single crystal Si C layer 6 by heating the Si substrate 1 in a carbon-based gas atmosphere (FIG. 8 (B)). At this time, it is performed that the Si layer near the interface 8 with the embedded insulating layer 4 is left as the remaining Si layer 5.
- the single crystal Si C epitaxial layer 7 is grown by epitaxial growth using the single crystal Si C layer 6 as a seed layer (FIG. 8 (C)).
- the Si substrate 1 is a buried insulating layer 4 in the vicinity of the surface of the Si base material 2.
- a SiO 2 layer of a predetermined thickness is formed, and a surface Si layer 3 of a predetermined thickness is formed on the surface.
- the thickness of the buried insulating layer 4 is set to be about 1 to 200 nm.
- the surface Si layer 3 of the Si substrate 1 is thinned and thinned.
- This thinning can be performed, for example, by heating the Si substrate 1 in an oxidizing atmosphere to leave a Si layer of a desired thickness in the vicinity of the interface 8 with the embedded insulating layer 4.
- the oxide layer 9 on the surface is removed by etching with hydrofluoric acid or the like, and the desired thickness of S left near the interface 8 is obtained.
- Thinning is performed by exposing the i layer.
- the thickness of the thinned surface S i layer 3 is preferably set to about 6 nm to 40 nm, and more preferably 8 8 ⁇ ! ⁇ 3 O n m or so, more preferable 1 0 ⁇ ⁇ ! It is about 2 to 7 nm.
- the thickness of the thinned surface S i layer 3 is less than 6 nm, the residual S i layer 5 having a sufficient thickness can not be left by the subsequent transformation step, and the primary single crystal S i C layer having a sufficient thickness. 6 can not be generated.
- the thickness of the surface S i layer 3 having a thickness of more than 40 nm exceeds 40 nm, it takes time for the modification treatment described later, or the thickness of the remaining S i layer 5 becomes too thick. This is because defects such as a boyid are likely to occur in the vicinity.
- the thickness of the surface Si layer 3 after thinning is adjusted by adjusting the oxidation treatment conditions such as the atmosphere, temperature, and time when the oxide layer 9 is formed by heat treating the Si substrate 1 in an oxidizing atmosphere,
- the thickness can be set by adjusting the thickness of the oxide layer 9 to be formed with respect to the thickness of the original surface S i layer 3.
- the surface Si layer 3 is transformed into a single crystal Si C layer 6 by heating the Si substrate 1 in a carbon-based gas atmosphere.
- the above transformation step is performed, for example, by an apparatus shown in FIG.
- This apparatus comprises a heating furnace 10 having a heater 11 and bombes 1 3 and 14 for storing atmosphere gas (hydrogen gas G 1 and hydrocarbon gas G 2) introduced into the heating furnace 10. Is equipped.
- a mixer 12 mixes hydrogen gas G 1 and hydrocarbon gas G 2 and supplies the mixed gas as a mixed gas to the heating furnace 10.
- the above Si substrate 1 is installed in the heating furnace 10 by the above apparatus, and the mixed gas (G 1 + G 2) of hydrogen gas G 1 and hydrocarbon gas G 2 is supplied into the heating furnace 10. While the ambient temperature in the heating furnace 10 is raised, the surface Si layer 3 of the Si substrate 1 is transformed into a single crystal Si C layer 6.
- the Si substrate 1 is placed in the heating furnace 10, and mixed in the heating furnace 10 with the hydrogen gas G 1 mixed with the hydrocarbon gas G 2 at a ratio of 1% by volume.
- the atmosphere temperature in the heating furnace 10 is 500 ° C. to less than the melting point of silicon, preferably 1 200 to 1 Heat to 40 ° C.
- the surface S i layer 3 of the S i substrate 1 is transformed into a single crystal S i C layer 6.
- the hydrogen gas G 1 is a carrier gas, and for example, propane gas is used as the hydrocarbon gas G 2.
- the supply amount of hydrogen gas G 1 from bomb 13 is 100 cc.min
- the supply amount of hydrocarbon gas G 2 from bomb 14 is 10 cc Z min. Do.
- the thickness of the single crystal Si C layer 6 is preferably set to about 3 nm to 20 nm in order to reduce defects in the same layer and to suppress three-dimensional growth, more preferably 4 n ⁇ ! It is about 10 n m, more preferably 5 5 ⁇ ! It is about 7 nm.
- the surface Si layer 3 and the buried insulating layer 4 in the surface Si layer 3 It is performed to leave the remaining Si layer 5 in the vicinity of the interface 8 of the
- the thickness of the remaining Si layer 5 is preferably set to 3 to 20 nm, more preferably 3 to 17 nm. If the thickness of the residual Si layer 5 is less than 3 nm, the effect of improving the flatness of the interface 8 between the residual Si layer 5 and the buried insulating layer 4 is poor, and the thickness of the residual Si layer 5 is 2 0 If it exceeds nm, defects such as a void are likely to occur in the vicinity of the interface 8.
- the thickness of the remaining Si layer 5 is a single crystal Si C layer formed with respect to the thickness of the surface Si layer 3 when the film is thinned by adjusting the conditions such as the atmosphere of the modification treatment, the temperature, and the time. It can be set by adjusting the thickness of 6.
- the above steps are performed in excess to deposit the single crystal Si C layer 6 on the single crystal Si C layer 6.
- a carbon thin film is deposited on the single-crystal SiC layer 6 by performing the above-described steps in excess (for example, continuing for several minutes to several hours).
- a single crystal SiC is grown by epitaxial growth using the single crystal SiC layer 6 as a seed layer, and a single crystal Si epitaxial layer 7 is deposited.
- the above-mentioned epitaxial growth can grow single crystal Si c under the following conditions, for example. That is, a source gas comprising Si substrate 1 on which single crystal Si C layer 6 is formed is disposed in a processing chamber 1 and containing monomethylsilane or silane and a hydrocarbon-based gas such as propane in the processing chamber 1 While supplying the gas at a gas flow rate of about 1 to 1000 sccm under a pressure not higher than atmospheric pressure, the temperature is 500.degree. C. to the melting point of silicon, preferably 800 to 1: 140. By treating at a temperature of ° C., single crystal Si can be grown by epitaxial growth using the single crystal Si c layer 6 as a seed layer.
- a source gas comprising Si substrate 1 on which single crystal Si C layer 6 is formed is disposed in a processing chamber 1 and containing monomethylsilane or silane and a hydrocarbon-based gas such as propane in the processing chamber 1 While supplying the gas at a gas flow rate of about 1 to 1000 scc
- a part of Si constituting the S i C embedded buried insulating layer 4 (S i O 2 ) formed by the above-mentioned modification-processed epitaxial growth is a part 2 of co 2 at the time of high temperature sublimation. It is thought that. Further, when exposed to a high temperature in a state where S i C and S i O 2 are in contact, considered you mutual modification between S i C and S i O 2.
- a residual Si layer 5 of appropriate thickness is present between the single crystal Si C layer 6 and the buried insulating layer 4 (Si 2 O 3 ). It is considered that such mutual modification with S i C and S i O 2 is prevented, and the flatness of the interface 8 between the residual S i layer 5 and the buried insulating layer 4 is maintained.
- the presence of the residual Si layer 5 prevents the defect from reaching the buried insulating layer 4 and prevents sublimation of Si, and residual Si i It is considered that the flatness of the interface 8 between the layer 5 and the buried insulating layer 4 is maintained.
- the thickness of the single crystal Si C layer 6 obtained by the modification treatment is also planarized, and it is thought that the crystal faces become aligned. Be Then, even when a single crystal SiC is grown by epitaxial growth thereafter, the crystallinity of the aligned SiC is maintained, so the single crystal is much cleaner than before, and the film thickness is A uniform single crystal S i C epitaxial layer 7 can be obtained. By doing this, the single crystal SiC layer 6 and the buried insulating layer can be obtained.
- the remaining Si layer 5 is formed in the vicinity of the interface 8 with 4, the flatness of the interface 8 with the buried insulating layer 4 thereunder is significantly improved, and the “wave” of the interface is significantly reduced. it can. Since the flatness of the interface 8 between the buried insulating layer 4 and the remaining Si layer 5 is improved, the “waviness” generated in the single crystal Si C layer 6 itself formed on the surface is also significantly reduced. In this manner, the single-crystal SiC layer 6 with a low degree of waviness is formed, thereby significantly improving the performance as a semiconductor device.
- the epitaxial growth is performed on the single crystal Si substrate in which the remaining Si layer 5 is left in the vicinity of the interface 8 with the above-described buried insulating layer 4, thereby further forming an upper layer of the single crystal Si C layer 6 on the surface.
- the crystal of SiC is also grown when epitaxial silicon is further formed on the upper layer of single crystal SiC layer 6 as described above. As the properties are improved, it becomes possible to obtain a clean single crystal and a uniform SiC.
- Example B When the thickness of the remaining Si layer 5 is 3 to 20 nm, the flatness of the interface 8 between the buried insulating layer 4 and the remaining Si layer 5 and the single crystal Si C layer 6 itself is determined. A sufficient improvement effect can be obtained, and defects such as a void are hardly generated in the lower layer of the single crystal Si C layer 6, and a good semiconductor device can be obtained.
- Example B
- Example B of the method for producing a single crystal SiC substrate of the present invention will be described.
- the surface Si layer 3 has a thickness of 10 to 14 nm (lll) SI MO X substrate (SOI-A), and the surface Si layer 3 has a thickness of 18 to 22 nm (1 1 1) SI MO X substrate (SOI-B), thickness of surface Si layer 3 is 9 9 0 0 to 1 l OO nm (1 1 1)
- a bonded SOI substrate (SOI-c) was prepared as a starting material. Each of the above SOI substrates is inserted as a sample into an electric furnace, and the atmosphere in the electric furnace is 120 ° while introducing propane gas and hydrogen gas into the electric furnace at flow rates of 100 sccm and 10 S LM respectively. The temperature was raised until C was reached, and held at that temperature for 15 minutes.
- 3i of 3 to 7 11 111 was carbonized from the surface side of the surface Si layer 3 to be transformed into a single crystal Si c layer 6 (seed layer) having a thickness of 3 to 7 nm.
- SOI _A, SOI _B, and SOI—C are, respectively, 3 to 11 nm, 9 to 17 nm, and approximately 990 to 1 0 0 nm in the lower layer of the single crystal Si C layer 6 (side layer).
- the remaining Si layer 5 has a film structure.
- the power supply to the heating heater of the electric furnace was stopped, and at the same time the introduction of the two gases was stopped, while nitrogen at a flow rate of 10 S LM was introduced into the furnace and replaced with the two gases.
- the introduction of nitrogen gas is stopped while maintaining the ambient temperature at 700 ° C., and at the same time oxygen with a flow rate of 10 sccm. Gas was introduced for 1 hour.
- the introduction of oxygen gas causes excess carbon to adhere to the surface of the sample when S i C is generated by the introduction of propane gas, so this excess carbon reacts with oxygen to generate CO 2 , This is to effectively remove the excess carbon.
- the introduction of the oxygen was stopped, nitrogen gas with a flow rate of 4 S LM was introduced again, and the wafer was cooled out of the furnace until the entire sample was cooled to a predetermined low temperature, for example, about 80 ° C.
- Example B 1 Each single crystal Si C layer 6 according to the manufacturing method of Example B 1 and Comparative Example B 1 was evaluated by observing a cross-sectional TEM image.
- a cross-sectional TEM image of a single-crystal SiC layer 6 (seed layer) according to the manufacturing method of Comparative Example B1 starting from S O I-R e f is shown in FIG.
- a single crystal SiC layer 6 (seed layer) of about 5 nm thickness is formed directly on the buried insulating layer 4, but a large undulation of about 10 nm is generated at the upper interface of the buried insulating layer 4.
- Ru Along with this, a single-crystal SiC layer 6 (seed layer) itself showed a waviness of about 10 nm, and in the lattice image by the cross-section T E M, obvious Sic orientation was seen.
- Example B 1 Single crystal S i according to the process of Example B 1 starting from S O I 1 A.
- a cross-sectional TEM image of layer 6 (seed layer) is shown in FIG.
- a residual Si layer 5 having a thickness of 3 to 1: L 1 nm is left, and this makes it possible to form the buried insulating layer 4 thereunder.
- the flatness of interface 8 with it was improved, and the waviness of interface 8 could be reduced to less than 3 nm.
- the residual S i layer 5 remains in the lower layer of the single crystal S i C layer 6. This improves the flatness of the interface 8 with the underlying buried insulating layer 4 and reduces the curvature of the interface 8 to less than 3 nm.
- an improvement was observed in the orientation of S i C compared to Comparative Example B 1.
- the waviness of the single crystal SiC layer 6 (seed layer) was also suppressed to the level of less than 3 nm which is almost equal to the waviness of the interface 8.
- a sample with a single crystal Si C layer 6 (seed layer) formed according to the method of Example B 1 using the SOI A as a starting material is inserted into a reduced pressure epitaxial growth furnace, and about 2 x 10 4 torr of While introducing monomethylsilane at 3 sccm under reduced pressure into the epitaxial growth furnace, heating was performed until the wafer temperature reached 115 ° C., and the temperature was maintained for 10 minutes.
- a single crystal SiC epitaxial layer 7 having a thickness of about 100 nm was deposited on the single crystal SiC layer 6 (seed layer).
- a sample having a single crystal S i C layer 6 (seed layer) formed by the method of Comparative Example B 1 using SOI-R ef as a starting material is inserted into a vacuum epitaxial growth furnace, and the same procedure as in Example B 2 is performed. Under the conditions, a single crystal SiC epitaxial layer 7 having a thickness of about 100 nm was deposited on the single crystal SiC layer 6 (seed layer).
- FIG. 11 A cross-sectional TEM image of a single-crystal SiC epitaxial layer 7 according to the process of Example B 2 starting from S O I 1 A is shown in FIG.
- An approximately 1 OO nm thick single crystal Si C epitaxial layer 7 is formed on top of the single crystal Si C layer 6 (seed layer), and a 3 to 7 n 1 1 1 thick residual Si layer is formed under it. 5 are left.
- the good flatness of the buried insulating layer 4 upper interface 8 shown in FIG. 11 was maintained even after the subsequent S i C epitaxial process.
- SOI-B and SOI-C are used as starting materials, the good flatness of the upper surface 8 of the buried insulating layer 4 is maintained even after the Si C epitaxial process is performed. That was confirmed.
- the half width of the SiC (111) peak was evaluated by X-ray diffraction rocking curve method for each single crystal SiC epitaxial layer 7 according to the manufacturing method of Example B2 and Comparative Example B2.
- the evaluation results are summarized in Table B 2 below.
- the half value width of the single crystal S i C epitaxial layer 7 according to Example B 2 is a half of the single crystal S i C epitaxial layer 7 formed under the same conditions on the sample of Comparative Example B 1 It is a value of about 70 to 80% of the value width, and the remaining Si layer 5 is left under the single crystal Si C layer 6 (seed layer), so that the crystals of the single crystal Si C epitaxial layer 7 It has been confirmed that the quality is improved.
- Table B 2
- the present invention can be applied to the manufacture of a semiconductor substrate used for large scale integrated circuits and the like.
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US12/997,013 US8563442B2 (en) | 2008-06-10 | 2009-06-09 | Method for manufacturing nitrogen compound semiconductor substrate and nitrogen compound semiconductor substrate, and method for manufacturing single crystal SiC substrate and single crystal SiC substrate |
CN2009801216250A CN102057463B (zh) | 2008-06-10 | 2009-06-09 | 氮化合物半导体基板的制造方法和氮化合物半导体基板、单晶SiC基板的制造方法和单晶SiC基板 |
EP09762563.6A EP2296169B1 (en) | 2008-06-10 | 2009-06-09 | Method for manufacturing nitrogen compound semiconductor substrate, nitrogen compound semiconductor substrate, method for manufacturing single crystal sic substrate, and single crystal sic substrate |
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JP2008151433A JP2009302097A (ja) | 2008-06-10 | 2008-06-10 | 単結晶SiC基板の製造方法および単結晶SiC基板 |
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JP6248532B2 (ja) * | 2013-10-17 | 2017-12-20 | セイコーエプソン株式会社 | 3C−SiCエピタキシャル層の製造方法、3C−SiCエピタキシャル基板および半導体装置 |
JP2018101721A (ja) | 2016-12-21 | 2018-06-28 | 株式会社ニューフレアテクノロジー | 気相成長方法 |
CN112005344B (zh) * | 2018-04-27 | 2023-11-17 | 东京毅力科创株式会社 | 基板处理系统和基板处理方法 |
CN113957535B (zh) * | 2021-10-19 | 2022-12-27 | 林健峯 | 一种在硅衬底上形成单晶碳化硅薄膜的方法 |
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US5759908A (en) * | 1995-05-16 | 1998-06-02 | University Of Cincinnati | Method for forming SiC-SOI structures |
US7514339B2 (en) * | 2007-01-09 | 2009-04-07 | International Business Machines Corporation | Method for fabricating shallow trench isolation structures using diblock copolymer patterning |
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MOLLER H ET AL.: "Suppression of Si cavities at the SiC/Si interface during epitaxial growth of 3C-SiC on silicon-on-insulator", JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 148, no. 1, 2001, pages G16 - G24, XP008146557 * |
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KR20110015009A (ko) | 2011-02-14 |
CN102057463A (zh) | 2011-05-11 |
EP2296169B1 (en) | 2017-08-09 |
EP2296169A1 (en) | 2011-03-16 |
US8563442B2 (en) | 2013-10-22 |
TWI457476B (zh) | 2014-10-21 |
US20110089433A1 (en) | 2011-04-21 |
EP2296169A4 (en) | 2012-04-25 |
TW201005141A (en) | 2010-02-01 |
CN102057463B (zh) | 2012-11-07 |
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