JP2021163954A - 複合基板およびその製造方法 - Google Patents
複合基板およびその製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 67
- 239000010703 silicon Substances 0.000 claims abstract description 67
- 239000013078 crystal Substances 0.000 claims abstract description 48
- 239000010409 thin film Substances 0.000 claims abstract description 35
- 238000010030 laminating Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 56
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 34
- 238000005468 ion implantation Methods 0.000 claims description 24
- 150000002500 ions Chemical class 0.000 claims description 24
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- -1 hydrogen atom ion Chemical class 0.000 claims description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 125000004429 atom Chemical group 0.000 claims description 10
- 238000005229 chemical vapour deposition Methods 0.000 claims description 10
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 8
- 238000005240 physical vapour deposition Methods 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 229910004541 SiN Inorganic materials 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 4
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- 230000003647 oxidation Effects 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000000089 atomic force micrograph Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
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- 238000000879 optical micrograph Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000678 plasma activation Methods 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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Abstract
Description
直径150mmのシリコンウェーハの表面に熱酸化法(1000℃の水蒸気雰囲気を使用)で500nmの熱酸化膜(SiO2膜)を形成した。この時の熱酸化膜の表面粗さは10×10μmの原子間力顕微鏡(AFM)観察でRa=0.16nmであった。このウェーハに、水素イオン(H+)を3.6×1016/cm2のドーズ量で83KeVの加速エネルギーでイオン注入処理を行った。この時の熱酸化膜の表面粗さもAFM観察でRa=0.16nmであった。そして、この熱酸化を施した熱酸化シリコンウェーハ単体に温度500℃、窒素雰囲気で12時間の熱処理を行った。
直径150mmの第1のシリコンウェーハの表面に熱酸化法(1000℃の水蒸気雰囲気を使用)で500nmの熱酸化膜(SiO2膜)を形成した。この時の熱酸化膜の表面粗さは10×10μmのAFM観察でRa=0.16nmであった。この熱酸化を施した熱酸化シリコンウェーハに、水素イオン(H+)を表1に示す1.5×1016〜5.5×1016/cm2の範囲のドーズ量、83KeVの加速エネルギーでイオン注入処理を行った。そして、これらイオン注入を施した熱酸化シリコンウェーハ単体に、表1に示す300〜800℃の範囲の各温度で熱処理を行った。(保持時間は全て6時間)。
第2のシリコンウェーハに代えてタンタル酸リチウム(LT)ウェーハを用いた点と、研削・研磨によってLTウェーハを5μmの厚さまで薄化した点と、イオン注入を施した熱酸化シリコンウェーハに、表2に示す300〜600℃の範囲の各温度で熱処理を行った点を除いて(600℃はLTのキュリー温度から上限とした)、実施例2と同様にして複合基板を作製して、300℃30分の処理を施し、ダメージ層の形成および膜剥がれの有無について調べた。その結果を、表2に示す。なお、表2中の縦の数値が注入した水素イオンのドーズ量(×1016/cm2)であり、横の数値が貼り合せ前のイオン注入済みのシリコンウェーハに施した熱処理の温度(℃)である。
熱酸化法に代えてCVD法、PVD法の各方法でシリコンウェーハ上にシリコン酸化膜を形成し、研磨により表面を平滑化した点を除いて、実施例2、3と同様に複合基板を作製して、ダメージ層の形成および膜剥がれの有無について調べた。その結果は、実施例2、3と同様となり、本発明の効果は、酸化膜の形成方法に依存しないことがわかった。
張り合わせ面への活性化処理をプラズマ活性化処理に代えて真空イオンビーム法、オゾン水処理法、UVオゾン処理法の各処理法を行った点を除いて、実施例2、3と同様に複合基板を作製しして、ダメージ層の形成および膜剥がれの有無について調べた。その結果、活性化処理の違いによる有意差は認められなかった。よって、本発明の効果は、活性化処理の方法に強く依存しないことがわかった。また、活性化処理をウェーハのどちらか一方に施す場合と、双方に施す場合についても試験したが、結果に大きな違いは無かった。
注入するイオンをH+に代えてH2 +にして、ドーズ量を半分とするとともに加速エネルギーを2倍とした点を除いて、実施例2、3と同様に複合基板を作製しして、ダメージ層の形成および膜剥がれの有無について調べた。その結果、実施例2、3と同様の結果が得られた。
熱酸化膜(SiO2)に代えてSiON、SiN、Al2O3、TiO2、Ta2O5、Nb2O5、Y2O3又はZrO2の各材料で介在層を形成した点を除いて、実施例2、3と同様に複合基板を作製しして、ダメージ層の形成および膜剥がれの有無について調べた。その結果、実施例2、3と同様の結果が得られた。
接合体における研削・研磨によるシリコンウェーハ又はLTウェーハの薄化に代えて、シリコンウェーハ又はLTウェーハの貼り合せ面に予め水素イオンを注入し、貼り合せ後の接合体において注入界面に沿って剥離を行うことでシリコンウェーハ又はLTウェーハの薄化を行った点を除いて、実施例2、3と同様に複合基板を作製しして、ダメージ層の形成および膜剥がれの有無について調べた。その結果、実施例2、3と同様の結果が得られた。
11 介在層
12 ダメージ層
20 単結晶シリコン基板または酸化物単結晶基板
20a 単結晶シリコン薄膜または酸化物単結晶薄膜
30 接合体
40 複合基板
Claims (12)
- シリコンウェーハと、介在層と、単結晶シリコン薄膜または酸化物単結晶薄膜とが順に積層された複合基板の製造方法であって、
シリコンウェーハにイオン注入処理をした後、熱処理を施すことで、前記シリコンウェーハの上層部にダメージ層を形成するステップと、
前記シリコンウェーハと単結晶シリコンウェーハまたは酸化物単結晶ウェーハとを、介在層を介して貼り合わせて接合体を得るステップと、
前記接合体の前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハを薄化して単結晶シリコン薄膜または酸化物結晶薄膜とするステップと
を含む複合基板の製造方法。 - 前記介在層が、SiO2、SiON、SiN、Al2O3、TiO2、Ta2O5、Nb2O5、Y2O3又はZrO2を含む請求項1に記載の複合基板の製造方法。
- 前記介在層を、前記シリコンウェーハを熱酸化することで形成する請求項1に記載の複合基板の製造方法。
- 前記介在層を、化学的気相成長法(CVD法)又は物理的気相成長法(PVD法)で形成する請求項1又は2に記載の複合基板の製造方法。
- 前記イオン注入処理で注入するイオン種が水素原子イオン(H+)であり、ドーズ量が2.5×1016〜5.0×1016atom/cm2の間である請求項1〜4のいずれか一項に記載の複合基板の製造方法。
- 前記イオン注入処理で注入するイオン種が水素分子イオン(H2 +)であり、ドーズ量が1.25×1016〜2.5×1016atoms/cm2の間である請求項1〜4のいずれか一項に記載の複合基板の製造方法。
- 前記熱処理を400℃以上の温度で行う請求項1〜6のいずれか一項に記載の複合基板の製造方法。
- 前記接合体の前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハの薄化を、研削、研磨又はこれらの組み合わせによって行う請求項1〜7のいずれか一項に記載の複合基板の製造方法。
- 前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハの張り合わせ面に対してイオン注入処理を行い、前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハの内部にイオン注入層を形成するステップを更に含み、
前記接合体の前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハの薄化を、前記接合体から、単結晶シリコン薄膜または酸化物単結晶薄膜として前記イオン注入層を残して前記単結晶シリコンウェーハまたは前記酸化物単結晶ウェーハの残りの部分を剥離することによって行う請求項1〜7のいずれか一項に記載の複合基板の製造方法。 - シリコンウェーハと、介在層と、単結晶シリコン薄膜または酸化物単結晶薄膜とが順に積層された複合基板であって、前記シリコンウェーハの前記介在層側の部分内にダメージ層を有する複合基板。
- 前記介在層が、SiO2、SiON、SiN、Al2O3、TiO2、Ta2O5、Nb2O5、Y2O3又はZrO2を含む請求項10に記載の複合基板。
- 前記酸化物単結晶薄膜が、タンタル酸リチウム(LT)又はニオブ酸リチウム(LN)を含む請求項10又は11に記載の複合基板。
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