JP5548351B2 - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP5548351B2 JP5548351B2 JP2008273417A JP2008273417A JP5548351B2 JP 5548351 B2 JP5548351 B2 JP 5548351B2 JP 2008273417 A JP2008273417 A JP 2008273417A JP 2008273417 A JP2008273417 A JP 2008273417A JP 5548351 B2 JP5548351 B2 JP 5548351B2
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- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- 229910052743 krypton Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- SYHGEUNFJIGTRX-UHFFFAOYSA-N methylenedioxypyrovalerone Chemical compound C=1C=C2OCOC2=CC=1C(=O)C(CCC)N1CCCC1 SYHGEUNFJIGTRX-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 150000002831 nitrogen free-radicals Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000004335 scaling law Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- PQDJYEQOELDLCP-UHFFFAOYSA-N trimethylsilane Chemical compound C[SiH](C)C PQDJYEQOELDLCP-UHFFFAOYSA-N 0.000 description 1
- VEDJZFSRVVQBIL-UHFFFAOYSA-N trisilane Chemical compound [SiH3][SiH2][SiH3] VEDJZFSRVVQBIL-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
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- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
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- H01L27/1266—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
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- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
- H01L21/2003—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy characterised by the substrate
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Description
本形態では、バッファ層を間に介して単結晶半導体層が支持基板に固定されている半導体基板を用いた半導体装置の作製方法について説明する。
上記のような水素プラズマ中には、H+イオン、H2 +イオン、H3 +イオンといった水素イオン種が存在する。ここで、各水素イオン種の反応過程(生成過程、消滅過程)について、以下に反応式を列挙する。
e+H→e+H++e ・・・・・ (1)
e+H2→e+H2 ++e ・・・・・ (2)
e+H2→e+(H2)*→e+H+H ・・・・・ (3)
e+H2 +→e+(H2 +)*→e+H++H ・・・・・ (4)
H2 ++H2→H3 ++H ・・・・・ (5)
H2 ++H2→H++H+H2 ・・・・・ (6)
e+H3 +→e+H++H+H ・・・・・ (7)
e+H3 +→H2+H ・・・・・ (8)
e+H3 +→H+H+H ・・・・・ (9)
上記のように、H3 +イオンは、主として反応式(5)により表される反応過程により生成される。一方で、反応式(5)と競合する反応として、反応式(6)により表される反応過程が存在する。H3 +イオンが増加するためには、少なくとも、反応式(5)の反応が、反応式(6)の反応より多く起こる必要がある(なお、H3 +イオンが減少する反応としては他にも(7)、(8)、(9)が存在するため、(5)の反応が(6)の反応より多いからといって、必ずしもH3 +イオンが増加するとは限らない。)。反対に、反応式(5)の反応が、反応式(6)の反応より少ない場合には、プラズマ中におけるH3 +イオンの割合は減少する。
ここで、水素イオン種の割合(特にH3 +イオンの割合)が異なる例を示す。図18は、100%水素ガス(イオン源の圧力:4.7×10−2Pa)から生成されるイオンの質量分析結果を示すグラフである。なお、上記質量分析は、イオン源から引き出されたイオンを測定することにより行った。スペクトルのピーク位置から質量数が見積もられ、質量数がおよそ1、2、3の三つのイオンが検出された。装置の都合上、H2 +イオンは質量数が2のイオン、H3 +イオンは質量数が3のイオンとして検出され、質量数1、質量数2、質量数3のピークは、それぞれ、H+イオン、H2 +イオン、H3 +イオンに対応する。グラフの横軸は質量数を電荷の価数で割った値であり、縦軸は、スペクトルの強度であり、イオンの数に対応する。図18では、イオンの数量を、H3 +イオンを100とした場合の相対比で表している。図18から、上記イオン源により生成されるイオンの割合は、H+イオン:H2 +イオン:H3 +イオン=1:1:8程度となることが分かる。なお、このような割合のイオンは、プラズマを生成するプラズマソース部(イオン源)と、当該プラズマからイオンビームを引き出すための引出電極などから構成されるイオンドーピング装置によっても得ることが出来る。
図18のような複数種類のイオンを含むプラズマを生成し、生成された複数種類のイオンを質量分離しないで単結晶半導体基板に照射する場合、単結晶半導体基板の表面には、H+イオン、H2 +イオン、H3 +イオンの各イオンが照射される。イオンの照射からイオン導入領域形成にかけてのメカニズムを再現するために、以下の5種類のモデルを考える。
1.照射される水素イオン種がH+イオンで、照射後もH+イオン(或いはH)である場合。
2.照射される水素イオン種がH2 +イオンで、照射後もH2 +イオン(或いはH2)のままである場合。
3.照射される水素イオン種がH2 +イオンで、照射後に2個のH(或いはH+イオン)に分裂する場合。
4.照射される水素イオン種がH3 +イオンで、照射後もH3 +イオン(或いはH3)のままである場合。
5.照射される水素イオン種がH3 +イオンで、照射後に3個のH(或いはH+イオン)に分裂する場合。
上記のモデルを基にして、水素イオン種をシリコン基板に照射する場合のシミュレーションを行った。シミュレーション用のソフトウェアとしては、SRIM(the Stopping and Range of Ions in Matter)を用いた。SRIMは、モンテカルロ法によるイオン導入過程のシミュレーションソフトウェアであり、TRIM((the Transport of Ions in Matter)の改良版である。なお、計算の関係上、モデル2ではH2 +イオンを質量数2倍のH+イオンに置き換えて計算した。また、モデル4ではH3 +イオンを質量数3倍のH+イオンに置き換えて計算した。さらに、モデル3ではH2 +イオンを運動エネルギー1/2のH+イオンに置き換え、モデル5ではH3 +イオンを運動エネルギー1/3のH+イオンに置き換えて計算を行った。
[フィッティング関数]
=X/V×[モデル1のデータ]+Y/V×[モデル5のデータ]
・モデル3に示される照射過程により導入される水素は、モデル5の照射過程と比較して僅かであるため、除外して考えても大きな影響はない(SIMSデータにおいても、ピークが現れていない)。
・モデル5とピーク位置の近いモデル3は、モデル5において生じるチャネリング(結晶の格子構造に起因し、照射された原子が結晶格子の隙間をすり抜ける現象)により隠れてしまう可能性が高い。すなわち、モデル3のフィッティングパラメータを見積もるのは困難である。これは、本シミュレーションが非晶質シリコンを前提としており、結晶性に起因する影響を考慮していないことによるものである。
図18に示すようなH3 +イオンの割合を高めた水素イオン種を単結晶半導体基板に照射することで、H3 +イオンに起因する複数のメリットを享受することができる。例えば、H3 +イオンはH+イオンやHなどに分離して基板内に導入されるため、主にH+イオンやH2 +イオンを照射する場合と比較して、水素の照射効率を向上させることができる。これにより、絶縁表面上に形成された単結晶半導体層を有する半導体基板の生産性向上を図ることができる。また、同様に、H3 +イオンが分離した後のH+イオンやHの運動エネルギーは小さくなる傾向にあるから、薄い単結晶半導体層の製造に向いている。
本形態では、本発明に係る半導体装置の作製に用いることのできる他の構成の半導体基板について説明する。
本形態では、上記実施の形態と異なる構成のトランジスタ及びその作製方法について説明する。以下、図4〜図6の断面図を用いて説明する。なお、本形態では、nチャネル型のトランジスタとpチャネル型のトランジスタを同時に作製する方法を説明する。
本形態では、上記実施の形態と異なる構成のトランジスタおよびその作製方法について説明する。以下、図7〜図9の断面図を用いて説明する。なお、本形態では、nチャネル型のトランジスタとpチャネル型のトランジスタを同時に作製する方法を説明する。
上記実施の形態では、本発明に係る半導体装置の作製方法としてトランジスタの作製方法を説明したが、半導体基板にトランジスタとともに容量、抵抗など各種の半導体素子を形成することで、高付加価値の半導体装置を作製することができる。本形態では、図面を参照しながら本発明に係る半導体装置の具体的な態様を説明する。
104 バッファ層
106 絶縁層
107 絶縁層
108 絶縁層
110 分離層
112 単結晶半導体基板
114 単結晶半導体層
116 剥離基板
118 レーザビーム
120 単結晶半導体層
122 ゲート絶縁層
124 導電層
130 層間絶縁層
132 層間絶縁層
152 絶縁層
154 絶縁層
180 レジストマスク
182 不純物元素
184 レジストマスク
186 不純物元素
Claims (3)
- 支持基板上にバッファ層を間に挟んで貼り合わされ、分離層が形成された単結晶半導体基板に対し、加熱により、前記分離層又は前記分離層の近傍を分離面として前記単結晶半導体基板を分離させることにより、前記支持基板上に単結晶半導体層を形成する工程と、
前記単結晶半導体層にレーザビームを照射して溶融させることにより、前記単結晶半導体層を再単結晶化させる工程と、
前記単結晶半導体層を選択的にエッチングして島状の単結晶半導体層を形成する工程と、
前記島状の単結晶半導体層上にゲート絶縁層を間に介してゲート電極を形成する工程と、
前記ゲート電極をマスクとして前記島状の単結晶半導体層に不純物元素を添加して、前記島状の単結晶半導体層に一対の不純物領域と、前記一対の不純物領域の間のチャネル形成領域と、を形成する工程と、
400℃以上支持基板の歪み点温度以下、且つ前記島状の単結晶半導体層を溶融させない処理温度で前記島状の単結晶半導体層を加熱する工程と、を有し、
イオンドーピング装置を用いて、水素を含む原料ガスにより生成されたH3 +イオンを照射することにより、前記分離層を形成し、
前記H3 +イオンの割合を、前記水素を含む原料ガスにより生成されたイオンの総量に対して80%以上とすることを特徴とする半導体装置の作製方法。 - ガラス基板上にバッファ層を間に挟んで貼り合わされ、分離層が形成された単結晶半導体基板に対し、加熱により、前記分離層又は前記分離層の近傍を分離面として前記単結晶半導体基板を分離させることにより、前記ガラス基板上に単結晶半導体層を形成する工程と、
前記単結晶半導体層にレーザビームを照射して溶融させることにより、前記単結晶半導体層を再単結晶化させる工程と、
前記単結晶半導体層を選択的にエッチングして島状の単結晶半導体層を形成する工程と、
前記島状の単結晶半導体層上にゲート絶縁層を間に介してゲート電極を形成する工程と、
前記ゲート電極をマスクとして前記島状の単結晶半導体層に不純物元素を添加して、前記島状の単結晶半導体層に一対の不純物領域と、前記一対の不純物領域の間のチャネル形成領域と、を形成する工程と、
450℃以上650℃以下の処理温度で前記島状の単結晶半導体層を加熱する工程と、を有し、
イオンドーピング装置を用いて、水素を含む原料ガスにより生成されたH3 +イオンを照射することにより、前記分離層を形成し、
前記H3 +イオンの割合を、前記水素を含む原料ガスにより生成されたイオンの総量に対して80%以上とすることを特徴とする半導体装置の作製方法。 - 請求項1または請求項2において、
酸素濃度が30ppm以下であり、かつ、水分濃度が30ppm以下である窒素雰囲気中で、前記単結晶半導体層に前記レーザビームを照射することを特徴とする半導体装置の作製方法。
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