JP6619874B2 - 多結晶SiC基板およびその製造方法 - Google Patents
多結晶SiC基板およびその製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 231
- 238000004519 manufacturing process Methods 0.000 title claims description 34
- 239000013078 crystal Substances 0.000 claims description 107
- 238000000034 method Methods 0.000 claims description 50
- 239000000463 material Substances 0.000 claims description 38
- 238000005229 chemical vapour deposition Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000005092 sublimation method Methods 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 168
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 160
- 238000009826 distribution Methods 0.000 description 17
- 239000004065 semiconductor Substances 0.000 description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 14
- 239000007789 gas Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000005304 joining Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000000859 sublimation Methods 0.000 description 3
- 230000008022 sublimation Effects 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001887 electron backscatter diffraction Methods 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 2
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 2
- 239000005052 trichlorosilane Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Description
また、本開示の別の態様の多結晶SiC基板の製造方法は、基材作製工程と、成長工程と、分離工程とを備え、第2下地基材の両面のうち一方の面における多結晶SiCの結晶粒径の平均値と、他方の面における多結晶SiCの結晶粒径の平均値との差分を、第2下地基材の厚さで除算した値である基材粒径変化率が0.43%以下である。
本実施形態の接合基板1は、図1に示すように、支持基板2と、支持基板2の表面に貼り合わされた半導体層3とを備える。支持基板2は、多結晶SiCで、例えば厚さが350μm程度の円盤状に形成される。なお、支持基板2の多結晶SiCは、4H−SiC結晶、6H−SiC結晶および3C−SiC結晶の何れか、あるいはその混合物で構成されている。
図2Aに示すように、接合基板1の製造方法では、まずS10にて、下地基材作製工程が行われる。本実施形態の下地基材とは、多結晶SiCを成長させるための下地となる材料のことをいう。下地基材作製工程では、まず、図3Aに示すように、カーボンで円盤状に形成されたカーボン基材21の表面に、化学気相成長法(CVD:Chemical Vapor Deposition)により、例えば2mmの厚さの多結晶SiC22を成長させる。Siの原料ガスとしては、テトラクロロシラン、トリクロロシランおよびジクロルシランが挙げられる。Cの原料ガスとしては、エタン、プロパンおよびアセチレンが挙げられる。また、原料ガスとしてテトラメチルシランなどの単一ガスを用いてもよい。この化学気相成長法における成長温度は例えば1400℃である。多結晶SiC22の成長後に、カーボン基材21の表面に多結晶SiC22が形成された円盤状部材の外周を研削する。その後、この円盤状部材を1000℃の大気雰囲気で加熱する。これにより、カーボン基材21が大気雰囲気で燃焼し、多結晶SiC22からカーボン基材21が除去される。次に、多結晶SiC22の成長最表面22aを例えば0.2mm研削して平坦化した後に、多結晶SiC22におけるカーボン基材側の面22bを例えば1.45mm研削する。これにより、厚さが0.35mmの下地基材11が得られる(図2Bの下地基材11を参照)。
そして、下地基材11において多結晶SiC12が接触する接触面と平行な面に沿ってレーザ光LSを2次元走査することにより、表面から400μmの位置に切断面を形成し、多結晶SiC12を下地基材11から剥離する。
基板の反りの曲率半径とは、基板が反ることによる曲がり具合を最もよく近似する円の半径である。
図7Aは、結晶粒径変化率が1.14%である支持基板の表面における結晶粒の分布を示す図である。図7Bは、結晶粒径変化率が1.14%である支持基板の表面における結晶粒径の分布を示すヒストグラムである。支持基板の表面における結晶粒径の平均値は、11μmである。
なお、上述のように、下地基材11の表面から成長する多結晶SiC12は、下地基材11の結晶構造を引き継ぐ。このため、結晶粒径変化率が0.43%以下となる多結晶SiC12を製造するためには、S20のSiC成長工程において、結晶粒径変化率が0.43%以下となる下地基材11の表面と裏面とに多結晶SiC12を成長させる必要がある。
下地基材作製工程では、カーボンで形成されたカーボン基材21の上に、予め設定された第1成長条件(本実施形態では、成長温度が1400℃である化学気相成長法)で多結晶SiC22を成長させた後に、カーボン基材21の上に成長した多結晶SiC22を切り出すことにより、多結晶SiCで形成された下地基材11を作製する(S10)。
また、カーボン基材21は本開示における第1下地基材、下地基材11は本開示における第2下地基材、下地基材11の結晶粒径変化率は本開示における基材粒径変化率である。
例えば上記実施形態では、レーザ光を照射することにより、多結晶SiC12を下地基材11から分離させる形態を示したが、周知のワイヤ放電加工技術またはワイヤソーによる切断技術を用いて、多結晶SiC12を分離させるようにしてもよい。
Claims (6)
- 多結晶SiCで形成された多結晶SiC基板であって、
前記多結晶SiC基板の両面のうち一方の面を第1面とするとともに他方の面を第2面として、前記第1面における多結晶SiCの結晶粒径の平均値と、前記第2面における多結晶SiCの結晶粒径の平均値との差分を、前記多結晶SiC基板の厚さで除算した値である基板粒径変化率が0.43%以下であり、且つ、
前記多結晶SiC基板の反りの曲率半径が142m以上である多結晶SiC基板。 - 請求項1に記載の多結晶SiC基板であって、
前記第1面および前記第2面の少なくとも一方において、算術平均粗さで表される表面粗度が1nm以下である多結晶SiC基板。 - 請求項1に記載の多結晶SiC基板であって、
前記第1面および前記第2面の少なくとも一方の表面において、
前記表面に形成された凹部の全てについて、前記表面と、前記凹部において前記表面から最も離れた地点との距離が3nm以下である多結晶SiC基板。 - 請求項1〜請求項3の何れか1項に記載の多結晶SiC基板であって、
化学気相成長法を用いて多結晶SiCを成長させた多結晶SiC基板。 - 請求項1〜請求項3の何れか1項に記載の多結晶SiC基板であって、
昇華法を用いて多結晶SiCを成長させた多結晶SiC基板。 - 多結晶SiC基板の製造方法であって、
第1下地基材の上に、予め設定された第1成長条件で多結晶SiCを成長させた後に、前記第1下地基材の上に成長した多結晶SiCを切り出すことにより、多結晶SiCで形成された第2下地基材を作製する基材作製工程と、
前記第2下地基材の上に、予め設定された第2成長条件で多結晶SiCを成長させる成長工程と、
前記第2下地基材の上に成長した多結晶SiCの少なくとも一部分を前記第2下地基材から分離させ、分離した多結晶SiCを前記多結晶SiC基板とする分離工程とを備え、
前記第2下地基材の両面のうち一方の面における多結晶SiCの結晶粒径の平均値と、他方の面における多結晶SiCの結晶粒径の平均値との差分を、前記第2下地基材の厚さで除算した値である基材粒径変化率が0.43%以下であり、且つ、前記多結晶SiC基板の反りの曲率半径が142m以上である多結晶SiC基板の製造方法。
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