JP4814498B2 - 半導体基板の製造方法 - Google Patents
半導体基板の製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 249
- 239000004065 semiconductor Substances 0.000 title claims description 188
- 238000004519 manufacturing process Methods 0.000 title claims description 44
- 238000000034 method Methods 0.000 claims description 112
- 238000009792 diffusion process Methods 0.000 claims description 108
- 229910052796 boron Inorganic materials 0.000 claims description 49
- 239000001257 hydrogen Substances 0.000 claims description 49
- 229910052739 hydrogen Inorganic materials 0.000 claims description 49
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 45
- 230000001629 suppression Effects 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 43
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 42
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 25
- 230000002401 inhibitory effect Effects 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 207
- 239000010408 film Substances 0.000 description 110
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 104
- 229910052710 silicon Inorganic materials 0.000 description 104
- 239000010703 silicon Substances 0.000 description 104
- 230000008569 process Effects 0.000 description 80
- 239000012535 impurity Substances 0.000 description 74
- 235000012431 wafers Nutrition 0.000 description 50
- 239000011229 interlayer Substances 0.000 description 44
- 239000011521 glass Substances 0.000 description 38
- 238000010438 heat treatment Methods 0.000 description 36
- 230000015572 biosynthetic process Effects 0.000 description 27
- 238000005468 ion implantation Methods 0.000 description 27
- 238000002513 implantation Methods 0.000 description 16
- 239000010409 thin film Substances 0.000 description 16
- 238000001994 activation Methods 0.000 description 11
- -1 mechanical polishing Substances 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 8
- 238000009826 distribution Methods 0.000 description 8
- 229910052581 Si3N4 Inorganic materials 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 230000002411 adverse Effects 0.000 description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000002955 isolation Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 5
- 238000005530 etching Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000005984 hydrogenation reaction Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000004151 rapid thermal annealing Methods 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001638 boron Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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Description
Michel Bruel ,"Smart-Cut:A New Silicon On Insulator Material Technology Based on Hydorogen Implantation and Wafer Bonding",Jpn.J.Appl.Phys.,Vol.36(1997),pp.1636-1641 G.K.Celler ,"frontiers of silicon-on-insulator",J.Appl.Phys.,Vol.93(2003),pp.4965
次に、本発明の作用について説明する。
図1〜図11は、本発明に係る実施形態1にかかる断面図である。本実施形態1においては、一方の基板に半導体デバイス部Tを全て形成した後、他の基板K(以下、基板Kと称する。)に貼り合せて半導体装置Sを形成する場合について説明する。また、説明の便宜上、上下左右といった位置或いは方向を示す記載については、図面を正面視した場合を基準として記載している。
次に、本実施形態の半導体基板S及び半導体デバイス部Tの製造方法について、図1〜図12を参照して説明する。
D≦2.7×108×E2.78・・・・・・・・・・・・(1)
となる。
1×1012cm−2≦D≦2.7×108×E2.78・・・(2)
となる。これは、図33の斜線部分に相当する。
以上のとおりであるので、この実施形態1によると、剥離工程における熱処理時に拡散抑止層35に配置されたホウ素の作用により、剥離用物質である水素をトラップできるため、水素が拡散抑止層35を越えて半導体層20側に拡散することを防止できる。従って、剥離工程において、水素が半導体層20に拡散することに起因して半導体層20の電気特性が悪影響を受けることを抑止することが可能である。
図13〜図23は、本発明に係る半導体基板の実施形態2にかかる半導体装置、及びその製造方法を示す断面図である。尚、以降の各実施形態では、図1〜図11と同じ部分に同じ符号を付して、その詳細な説明を省略する。
次に、本実施形態の半導体装置S、及びシリコン基板層Lを含む半導体デバイス部Tの製造方法について、図13〜図23を参照して説明する。
したがって、この実施形態によると、活性化されたホウ素により水素をトラップできるため、水素が後に半導体層20を形成する領域へ移動することを防げる。その結果、その後のデバイス形成工程において、閾値制御性が悪化せず、良好な特性のトランジスタを形成することが可能となる。
図24〜図32は、本発明に係る半導体基板の実施形態3にかかる半導体装置、及びその製造方法を示す断面図である。
次に、本実施形態の半導体装置Sの製造方法と、半導体層−ゲート電極部G、及びコンタクト−電極部Iにより構成される半導体デバイス部Tの製造方法とについて、図24〜図32を参照して説明する。
したがって、この実施形態によると他の実施形態と同様に、剥離用物質の悪影響が無く、しきい値制御性に優れ、しきい値ばらつきの小さな半導体シリコン薄膜を半導体層に用いることができる。
上記実施形態では、剥離用物質として水素イオンを適用したが、水素の代わりに水素と少なくとも1種類以上の不活性元素(例えばHe,Ne,Ar,Xe,Rn等)を注入するようにしてもよい。ヘリウムイオン等の不活性ガス元素は、電気的に不活性であり、不活性ガス元素の併用により水素元素濃度を減少させることができるため、水素元素によりトランジスタ等の半導体デバイス部Tに与える悪影響の度合いを軽減できる利点がある。ただし、注入工程を2回行う必要が生ずるデメリットがある。したがって、製造の容易化の観点からは、上述のように、剥離用物質には水素を適用することが好ましい。
K 基板
T 半導体デバイス部
G 半導体層−ゲート電極部
I コンタクト−電極部
1 半導体基板、シリコン基板
4 ゲート絶縁膜(絶縁層)
5 ホウ素(拡散抑止用物質)
13 水素(剥離用物質)
18 ガラス基板(基板)
20 半導体シリコン層(半導体層)
35 拡散抑止層(拡散抑止用物質含有層)
36 剥離層(剥離用物質含有層)
Claims (8)
- 基板の一部を剥離するための剥離用物質を前記基板に導入することにより、該基板の内部に剥離層を形成する工程と、
前記基板の一方の表面側に半導体デバイス部の少なくとも一部を形成する工程とを含む半導体基板の製造方法であって、
前記剥離層を形成する前に行われ、前記剥離層が形成される領域と前記半導体デバイス部の少なくとも一部が形成される領域との間に前記剥離用物質の透過拡散を抑止する拡散抑止層を形成する工程を有し、
前記拡散抑止層を形成する工程では、前記剥離用物質の拡散を抑止する拡散抑止用物質を前記基板の内部に導入することによって該基板の内部に前記拡散抑止層を形成することを特徴とする半導体基板の製造方法。 - 前記剥離層に沿って前記基板の一部を剥離する工程を有し、
前記基板は、前記剥離層に沿って一部が剥離される前に、前記半導体デバイス部の少なくとも一部が形成されることを特徴とする請求項1に記載の半導体基板の製造方法。 - 前記剥離層に沿って前記基板の一部を剥離する工程と、
一部が剥離された前記基板から前記剥離層及び前記拡散抑止層を除去する工程とを有し、
前記剥離層及び前記拡散抑止層を前記基板から除去した後に、前記半導体デバイス部の少なくとも一部を形成することを特徴とする請求項1に記載の半導体基板の製造方法。 - 基板の一部を剥離するための剥離用物質を前記基板に導入することにより、該基板の内部に剥離層を形成する工程と、
前記基板の一方の表面側に半導体デバイス部の少なくとも一部を形成する工程と、
前記剥離層が形成された前記基板における前記半導体デバイス部の少なくとも一部が形成されている側を、他の基板に貼り付ける工程と、
前記他の基板に貼り付けられた前記基板の一部を、前記剥離層に沿って剥離する剥離工程とを有する半導体基板の製造方法であって、
前記剥離層を形成する前に行われ、前記剥離層が形成される領域と前記半導体デバイス部の少なくとも一部が形成される領域との間に前記剥離用物質の透過拡散を抑止する拡散抑止層を形成する工程を有し、
前記拡散抑止層を形成する工程では、前記剥離用物質の拡散を抑止する拡散抑止用物質を前記基板の内部に導入することによって該基板の内部に前記拡散抑止層を形成することを特徴とする半導体基板の製造方法。 - 基板の一部を剥離するための剥離用物質を前記基板に導入することにより、該基板の内部に剥離層を形成する工程と、
前記剥離層が形成された前記基板を、他の基板に貼り付ける工程と、
前記他の基板に貼り付けられた前記基板の一部を、前記剥離層に沿って剥離する剥離工程と、
前記一部が剥離された基板に半導体デバイス部の少なくとも一部を形成する工程とを有する半導体基板の製造方法であって、
前記剥離層を形成する前に行われ、前記剥離層が形成される領域と前記半導体デバイス部の少なくとも一部が形成される領域との間に前記剥離用物質の透過拡散を抑止する拡散抑止層を形成する工程を有し、
前記拡散抑止層を形成する工程では、前記剥離用物質の拡散を抑止する拡散抑止用物質を前記基板の内部に導入することによって該基板の内部に前記拡散抑止層を形成することを特徴とする半導体基板の製造方法。 - 前記剥離用物質は、水素及び希ガスであることを特徴とする請求項1から5のいずれか1つに記載の半導体基板の製造方法。
- 前記拡散抑止用物質は、ホウ素であることを特徴とする請求項1から6のいずれか1つに記載の半導体基板の製造方法。
- 前記基板は、単結晶シリコン基板であることを特徴とする請求項1から7のいずれか1つに記載の半導体基板の製造方法。
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