WO2005010244A1 - 炭化珪素製品、その製造方法、及び、炭化珪素製品の洗浄方法 - Google Patents
炭化珪素製品、その製造方法、及び、炭化珪素製品の洗浄方法 Download PDFInfo
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- WO2005010244A1 WO2005010244A1 PCT/JP2004/009990 JP2004009990W WO2005010244A1 WO 2005010244 A1 WO2005010244 A1 WO 2005010244A1 JP 2004009990 W JP2004009990 W JP 2004009990W WO 2005010244 A1 WO2005010244 A1 WO 2005010244A1
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- Prior art keywords
- silicon carbide
- carbide product
- cleaning
- producing
- acid
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 103
- 238000004140 cleaning Methods 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 34
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000012535 impurity Substances 0.000 claims abstract description 32
- 239000004065 semiconductor Substances 0.000 claims abstract description 31
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 24
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 35
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 150000002506 iron compounds Chemical class 0.000 claims description 2
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 abstract description 9
- 230000002411 adverse Effects 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 19
- 235000012431 wafers Nutrition 0.000 description 19
- 239000010408 film Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005669 field effect Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- 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
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02378—Silicon carbide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02167—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon carbide not containing oxygen, e.g. SiC, SiC:H or silicon carbonitrides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/3148—Silicon Carbide layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31—Surface property or characteristic of web, sheet or block
Definitions
- Silicon carbide product method for manufacturing the same, and method for cleaning silicon carbide product
- the present invention relates to a silicon carbide product, and more particularly to silicon carbide used for a structure such as a semiconductor device and a member for manufacturing a semiconductor device and a method of manufacturing the same.
- silicon carbide is used as a member for manufacturing a semiconductor device, such as a furnace core pipe, a heat equalizing pipe, a transfer tray, and a cage, because it has excellent heat resistance. Furthermore, silicon carbide is also known to constitute the semiconductor device itself by utilizing its semiconducting properties.
- Reference 2 a member for manufacturing a semiconductor device formed of silicon carbide is heat-treated in a high-temperature oxygen atmosphere, It has been proposed to dissolve and remove the silicon oxide film on the surface with hydrofluoric acid after forming the silicon oxide film.
- Reference 3 cleaning silicon carbide with dilute hydrofluoric acid (HF 7%) and oxidizing the surface, and then cleaning with dilute HF (HF 5%) Each is disclosed.
- a method of forming a semiconductor device using silicon carbide a method of forming a field effect transistor is disclosed in Japanese Patent Laid-Open No. 2003-8672 (hereinafter referred to as Reference 3). It is done.
- Reference Document 3 After the gate insulating film of the field effect transistor is formed on the silicon carbide region, Reference Document 3 has a temperature in the range of 900 ° C. to 100 ° C. It is pointed out that the electron mobility can be improved by performing heat treatment for a predetermined time in an atmosphere containing water. Also, in Reference 3, before the growth of the gate oxide film, etc., the cleaning power with dilute HF, RCA cleaning in which NH 4 OH + H 2 0 2 and HC 1 + H 2 0 2 are combined is performed. The thing is also described.
- references 1 to 3 only disclose cleaning silicon carbide, and no consideration is given to the surface state of silicon carbide after cleaning. In other words, these references 1 to 3 do not disclose at all about the types of impurities remaining on the silicon carbide surface and the concentration of the impurities after cleaning by the usual method. Moreover, in order to form a semiconductor element using silicon carbide, it is essential to reduce contamination and defects, but the optimum value of the amount of contamination of silicon carbide and the adjustment method of the amount of contamination are described in References 1 to 3. Because no suggestion has been made, it is difficult to realize the theoretical characteristics of silicon carbide.
- an object of the present invention is to provide silicon carbide suitable for a semiconductor device and a member for manufacturing a semiconductor device.
- Another object of the present invention is to provide a cleaning method for obtaining the above-mentioned silicon carbide.
- Still another object of the present invention is to provide a product using silicon carbide with low impurity concentration.
- a silicon carbide product comprising a surface having a metal impurity concentration of 1 ⁇ 10 11 (atoms cm 2 ) or less.
- a method of cleaning a silicon carbide product comprising immersing silicon carbide in an acid to make the surface metal impurity 1 ⁇ 10 11 (at om s cm 2 ) or less. Is obtained.
- a method of producing a raw product is obtained.
- FIG. 1 is a diagram showing the evaluation results of cleaning by the conventional silicon carbide cleaning method
- FIG. 2 shows the removal effect of Fe on the surface of silicon carbide by the cleaning method according to the present invention
- FIG. 3 shows sulfuric acid (97%) and hydrogen peroxide (30%) used in the present invention
- Figure showing Fe removal effect on silicon carbide by water solution (SPM) containing
- FIG. 4 is a diagram showing the Ni removal effect on silicon carbide by the aqueous solution (S PM) used in FIG. 3;
- FIG. 5 is a view showing the effect of removing Cu on silicon carbide by the aqueous solution (S P M) used in FIG. 3 and FIG. 4;
- FIG. 6 is a view for explaining the effect of the present invention when silicon carbide is cleaned using an aqueous solution (SPM) containing sulfuric acid (97%) and hydrogen peroxide (30%);
- SPM aqueous solution
- FIG. 7 is a flow chart showing the case where the present invention is applied to the fabrication of a MOSFET having a silicon carbide substrate;
- FIG. 8 shows a process of manufacturing the MO S F E T according to the flow chart of FIG. 7;
- FIG. 9 is a cross-sectional view showing a step performed following the step shown in FIG. 8;
- FIG. 10 is a cross sectional view showing a step performed after the step shown in FIG. 9;
- FIG. 11 is a cross-sectional view for explaining a step performed subsequent to the step shown in FIG. 10;
- FIG. 12 is a cross-sectional view for explaining a step performed after the step shown in FIG. 13 is a cross-sectional view showing the back step of FIG. 12;
- FIG. 14 is a cross-sectional view showing a step performed after the step shown in FIG. 13;
- FIG. 15 is a flow chart for explaining the case of manufacturing a silicon carbide dummy wafer using the present invention.
- Fig. 16 shows one step of producing a silicon carbide dummy wafer according to the flow chart shown in Fig. 15;
- FIG. 17 illustrates the steps performed after the step shown in FIG. 16;
- FIG. 18 shows the steps performed subsequent to the step shown in FIG. 17;
- FIG. 19 is a diagram showing the final step of the process of manufacturing a silicon carbide dummy wafer.
- semiconductor devices using silicon carbide often can not obtain the characteristics as the theoretical value of silicon carbide, and silicon manufactured using silicon carbide members for manufacturing semiconductor devices.
- characteristics as theoretical values can not often be obtained, and it has been found that variations in these characteristics are attributable to the concentration of metal impurities on the surface of silicon carbide.
- silicon carbide or silicon semiconductor devices such as field effect transistors are adversely affected by the concentration of impurities on the silicon carbide surface, and characteristics as theoretical values can not be obtained.
- the present invention is based on such findings and provides a cleaning method capable of achieving the impurity concentration of the silicon carbide surface and the impurity concentration capable of eliminating adverse effects.
- iron (F e) and an iron alloy mainly remain as impurities on the silicon carbide surface even after cleaning, and the concentration of these impurities is 1 ⁇ 10 11 It has been found that if it is at oms / cm 2 or less, a suitable semiconductor device having characteristics very close to the theoretical value can be obtained.
- the impurity (Fe) concentration before and after cleaning when silicon carbide is cleaned by the conventional cleaning method is shown.
- (X 1 0 1 Q a t oms / cm 2) relative to the vertical axis 1.
- E + 03 The scale of is shown, and these scale show the concentration of ll X l C ⁇ l X l O ⁇ l X l 0 3 , respectively, with respect to (X 10 10 at om s / cm 2 ) .
- the horizontal axis shows the results of two washings with HC 1 + H 2 O 2 by the conventional washing method and the two washings with hydrofluoric acid (0.5%). The results are shown together with the degree 25.
- Table 1 below shows the iron removal rate when each cleaning on silicon carbide (SiC) is performed together with the content of the cleaning. As shown in Table 1 and FIG. 1 below, the concentration of metal impurities (iron or iron compounds) in the conventional cleaning method is much higher than 1 ⁇ 1011 (at oms / cm 2 ) found in the present invention. It can be seen that table 1
- the impurity concentration is also mentioned above by this RCA washing. It could not be less than 1 0 11 (at oms / cm 2 ).
- silicon carbide when cleaning silicon carbide, it contains iron by cleaning with a certain concentration of hydrofluoric acid or hydrochloric acid, or by using a solution containing sulfuric acid and hydrogen peroxide solution. It has been clarified that surface metal impurities can be removed to 1 ⁇ 10 11 (atoms / cm 2 ) or less.
- Table 2 below shows the cleaning solution and the iron removal rate when cleaning silicon carbide (SiC) with each cleaning solution, together with the cleaning conditions.
- the removal ratio of iron are calculated on 100- (impurities after cleaning (Atomscm 2) before cleaning impurities (atoms / cm 2)) X 100.
- SPM cleaning solution
- the iron removal rate after 10 minutes of rinsing is It is about 100%, 98-99% in the cleaning solution of hydrofluoric acid (50%) and 98% in the cleaning solution of hydrochloric acid (36%).
- FIG. 2 shows the removal effect of Fe of each cleaning solution on the silicon carbide surface corresponding to Table 2.
- the F 6 on the silicon carbide surface can be made 1101 1 (31 1 011 3 011 2 ) or less.
- an aqueous solution containing sulfuric acid (97%) and hydrogen peroxide (30%) is particularly excellent in Fe removal effect.
- Tables 3, 4 and 5 show the results of experiments using the metal impurity segregation evaluation system.
- the distribution of impurities after a solution containing Fe, Ni, and Cu is placed on a curved wafer of silicon carbide (SiC) and segregated, and a wafer in which the impurities are segregated according to the present invention
- the impurity distribution after washing by the method was measured.
- SP M aqueous solution
- the removal effects of i and Cu are shown in relation to the distance from the center of the curved wafer.
- Table 6 shows the change in the number of atoms before and after cleaning in the center of the silicon carbide surface of each component.
- Fe, N i and Cu can be reduced to 0.3, 0 and 0 respectively on the surface of the silicon carbide surface cleaned with SPM, even at the curved center where the amount of segregation is the highest. It can be seen that only 2 and 0.16 (at oms / cm 2 ) remain.
- Table 3 shows the change in the number of atoms before and after cleaning in the center of the silicon carbide surface of each component.
- FIG. 3 Fig. 4 and Fig. 5 correspond to Tables 3, 4 and 5 respectively, and the concentrations of Fe, N i and Cu at the silicon carbide surface (at om s Z cm 2 ) Is shown.
- Figures 3 to 5 show the removal effect of Fe, Ni, and Cu after washing with an aqueous solution (SPM) containing sulfuric acid (97%) and hydrogen peroxide solution (30%). The distance from the silicon carbide center is taken on the horizontal axis.
- SPM aqueous solution
- the method according to the first embodiment of the present invention can be applied to the manufacture of a field effect transistor (hereinafter abbreviated as MOSFET) having a gate, a source, and a drain.
- MOSFET field effect transistor
- SiC single crystal silicon carbide
- FIG. 7 is a flow chart of manufacturing a MOSFET using a silicon carbide substrate
- FIGS. 8 to 14 are cross sectional views sequentially showing a manufacturing process of the MOSFET using a silicon carbide substrate.
- a P-type 4H-SiC (0 001) substrate 1 is prepared as silicon carbide, and a P-type epitaxial layer is formed on the surface of the silicon carbide substrate 1.
- the cleaning according to the present invention was performed (FIG. 7, step SA1).
- the cleaning method mixed sulfuric acid (97%) and hydrogen peroxide solution (30%) at a volume ratio of 4: 1, and immersed silicon carbide substrate 1 in this chemical solution for 10 minutes. After immersion, it was rinsed with pure water for 10 minutes and dried by nitrogen blow.
- an aqueous solution in which sulfuric acid (97%) and hydrogen peroxide solution (30%) are mixed at a volume ratio of 4: 1 makes the P-type epitaxial layer.
- the silicon carbide substrate 1 provided with 2 was immersed in this chemical for 10 minutes (FIG. 7, step SA3). Then, after immersion, it was rinsed with pure water for 10 minutes and dried by nitrogen blow.
- the source and drain regions are opened in the resist 3 as shown in FIG. 10 by the photolithographic process to form source region openings 3a and drain region openings 3b (FIG. 7, Step SA4).
- the respective resists 3 c are actually continuous in the regions other than the openings 3 a and 3 b.
- step SA 5 nitrogen was ion-implanted into the source and drain region openings 3a and 3b to form n-type source and drain regions 4 and 4, respectively.
- an activation was performed (Fig. 7, step SA 5).
- a gate region is opened in the oxide films 5a and 5b to form a gate region opening 5c.
- Figure 7, step SA6 The oxide films 5a and 5b are continuously formed in portions other than the gate region opening 5c.
- the above-mentioned cleaning according to the present invention was performed before depositing the gate oxide film.
- the cleaning method is the same as the method described above, and the substrate shown in FIG. 12 is mixed in a cleaning solution in which sulfuric acid (97%) and hydrogen peroxide solution (30%) are mixed at a volume ratio of 4: 1. Soaked for 10 minutes (Fig. 7, step SA7). After immersion, it was rinsed with pure water for 10 minutes and dried by nitrogen blow.
- gate oxide film 6 was formed by thermal oxidation as shown in FIG. 7 Figure, Step SA8).
- step SA9 the oxide films 5a and 5b are continuously formed in portions 7a, 7b and 7c other than the electrodes, that is, in portions other than the openings 5c, 5d and 5e.
- a metal film such as Mo, W one S i 2, Mo-S i 2, T i one S i 2 such Shirisai de film, n or p-type Shirikonge one It may be any of the Here, as a cleaning solution, hydrofluoric acid (45% or more) or HC 1 (35% or more) may be used instead of a solution containing sulfuric acid and hydrogen peroxide solution.
- the present invention is applied to the manufacture of a polycrystalline silicon carbide wafer.
- Such polycrystalline silicon carbide wafers are mainly used as dummies in semiconductor device manufacturing processes using Si wafers, and high purity is required even when using such silicon carbide wafers in Si processes. Be done.
- FIG. 15 is a manufacturing flowchart of a silicon carbide dummy wafer
- FIGS. 16 to 19 are diagrams sequentially showing steps of manufacturing a silicon carbide dummy wafer according to the flow chart shown in FIG. 15.
- a disk-shaped graphite base 11 is first prepared, and then, as shown in FIG. 17, the entire surface of the graphite substrate 11 is covered, as shown in FIGS. Silicon carbide 12 was grown by the CVD method (FIG. 15, step SB 1). 'Furthermore, as shown in FIG. 18, processing was performed so as to remove the side portion of silicon carbide 12 so that the graphite base 11 was exposed (FIG. 15, step SB 2).
- a lead base material 11 having silicon carbide 12a and 12a provided on both sides was burned in an oxygen atmosphere to separate the silicon carbide wafer (FIG. 15, step SB3).
- the surfaces of the remaining silicon carbide wafers 12a and 12b were polished (step SB4).
- the silicon carbide wafer 1 was immersed for 10 minutes in the chemical solution (cleaning solution) according to the present invention in which sulfuric acid (97%) and hydrogen peroxide solution (30%) were mixed at a volume ratio of 4: 1. 15 Figure, step SB 5). After immersion, rinse with pure water for 10 minutes, It was dried by blowing to produce a polycrystalline silicon carbide wafer.
- the present invention it is possible to obtain silicon carbide having a high degree of cleanliness, and as a result, it is possible to obtain a semiconductor device which does not have to take into consideration deterioration of characteristics due to impurities. Furthermore, in the present invention, when applied to a member for manufacturing a semiconductor or the like, there is an advantage that the adverse effect on the processing object due to the scattering of the impurity can be prevented.
- the cleaning method according to the present invention is applied to the manufacture of a semiconductor device.
- the present invention is not limited to this, and members for manufacturing semiconductors such as diffusion furnaces and other structures. It can be applied to the body.
- the present invention can also be applied to the surface treatment of a member on which a silicon carbide thin film is formed.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/566,099 US20060234058A1 (en) | 2003-07-29 | 2004-07-07 | Silicon carbide product, method for producing same, and method for cleaning silicon carbide product |
CN2004800218523A CN1829830B (zh) | 2003-07-29 | 2004-07-07 | 碳化硅制品、其制造方法以及碳化硅制品的洗净方法 |
KR1020067001913A KR101110984B1 (ko) | 2003-07-29 | 2004-07-07 | 탄화규소 제품, 그의 제조방법 및 탄화규소 제품의세정방법 |
EP04747456.4A EP1666645B1 (en) | 2003-07-29 | 2004-07-07 | Method for producing and cleaning a silicon carbide product |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003281801A JP2005047753A (ja) | 2003-07-29 | 2003-07-29 | 炭化珪素製品、その製造方法、及び、炭化珪素製品の洗浄方法 |
JP2003-281801 | 2003-07-29 |
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Publication Number | Publication Date |
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WO2005010244A1 true WO2005010244A1 (ja) | 2005-02-03 |
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US (1) | US20060234058A1 (ja) |
EP (1) | EP1666645B1 (ja) |
JP (1) | JP2005047753A (ja) |
KR (1) | KR101110984B1 (ja) |
CN (1) | CN1829830B (ja) |
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WO (1) | WO2005010244A1 (ja) |
Cited By (1)
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CN102432011A (zh) * | 2011-10-08 | 2012-05-02 | 江苏佳宇资源利用股份有限公司 | 一种同步去除碳化硅微粉中铁、硅杂质的方法 |
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US7888685B2 (en) * | 2004-07-27 | 2011-02-15 | Memc Electronic Materials, Inc. | High purity silicon carbide structures |
JP5117740B2 (ja) * | 2007-03-01 | 2013-01-16 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法 |
JP5260127B2 (ja) * | 2008-04-18 | 2013-08-14 | 国立大学法人東北大学 | 炭化珪素の製造方法 |
WO2010125827A1 (ja) | 2009-04-30 | 2010-11-04 | ライオン株式会社 | 半導体用基板の洗浄方法および酸性溶液 |
JP5540937B2 (ja) * | 2009-07-03 | 2014-07-02 | 信越化学工業株式会社 | 高熱伝導性熱定着ロール又は高熱伝導性熱定着ベルト用シリコーンゴム組成物並びに定着ロール及び定着ベルト |
JP2012004270A (ja) * | 2010-06-16 | 2012-01-05 | Sumitomo Electric Ind Ltd | 炭化珪素半導体の洗浄方法、炭化珪素半導体および炭化珪素半導体装置 |
CN102543671B (zh) * | 2010-12-08 | 2015-02-11 | 中国科学院微电子研究所 | 半导体晶片的制造方法 |
WO2013011751A1 (ja) | 2011-07-20 | 2013-01-24 | 住友電気工業株式会社 | 炭化珪素基板、半導体装置およびこれらの製造方法 |
JP5803786B2 (ja) | 2012-04-02 | 2015-11-04 | 住友電気工業株式会社 | 炭化珪素基板、半導体装置およびこれらの製造方法 |
JP6028754B2 (ja) * | 2014-03-11 | 2016-11-16 | トヨタ自動車株式会社 | SiC単結晶基板の製造方法 |
KR101726804B1 (ko) * | 2015-12-17 | 2017-04-13 | 주식회사 싸이노스 | 반도체 제조공정에 사용하는 SiC 부재의 세정방법 |
JP6269709B2 (ja) * | 2016-03-28 | 2018-01-31 | 株式会社Sumco | 清浄度評価方法、洗浄条件決定方法、およびシリコンウェーハの製造方法 |
JP6128262B2 (ja) * | 2016-05-20 | 2017-05-17 | 住友電気工業株式会社 | 炭化珪素基板、半導体装置およびこれらの製造方法 |
US11094835B2 (en) | 2017-03-28 | 2021-08-17 | Mitsubishi Electric Corporation | Silicon carbide substrate, method for manufacturing silicon carbide substrate, and method for manufacturing silicon carbide semiconductor device |
JP6868601B2 (ja) * | 2018-11-01 | 2021-05-12 | 株式会社フェローテックマテリアルテクノロジーズ | SiC繊維を内包する管状体およびその製造方法 |
JP7491307B2 (ja) | 2019-05-17 | 2024-05-28 | 住友電気工業株式会社 | 炭化珪素基板 |
CN112830786A (zh) * | 2019-11-22 | 2021-05-25 | 中国电子科技集团公司第四十八研究所 | 一种碳化硅薄壁结构件的制备方法 |
CN112521154A (zh) * | 2020-12-22 | 2021-03-19 | 中国科学院上海硅酸盐研究所 | 具有高纯工作表面的SiC陶瓷器件及其制备方法和应用 |
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- 2004-07-07 RU RU2006106225/15A patent/RU2006106225A/ru not_active Application Discontinuation
- 2004-07-07 CN CN2004800218523A patent/CN1829830B/zh active Active
- 2004-07-07 EP EP04747456.4A patent/EP1666645B1/en active Active
- 2004-07-07 US US10/566,099 patent/US20060234058A1/en not_active Abandoned
- 2004-07-07 KR KR1020067001913A patent/KR101110984B1/ko active IP Right Grant
- 2004-07-07 WO PCT/JP2004/009990 patent/WO2005010244A1/ja active Application Filing
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CN102432011A (zh) * | 2011-10-08 | 2012-05-02 | 江苏佳宇资源利用股份有限公司 | 一种同步去除碳化硅微粉中铁、硅杂质的方法 |
Also Published As
Publication number | Publication date |
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US20060234058A1 (en) | 2006-10-19 |
CN1829830B (zh) | 2010-04-28 |
CN1829830A (zh) | 2006-09-06 |
EP1666645B1 (en) | 2019-06-19 |
EP1666645A4 (en) | 2009-01-07 |
KR101110984B1 (ko) | 2012-02-17 |
EP1666645A1 (en) | 2006-06-07 |
RU2006106225A (ru) | 2006-08-27 |
JP2005047753A (ja) | 2005-02-24 |
KR20070012771A (ko) | 2007-01-29 |
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