JP5221928B2 - Ybがドープされたポリシリコンゲートのドライエッチング方法 - Google Patents
Ybがドープされたポリシリコンゲートのドライエッチング方法 Download PDFInfo
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- JP5221928B2 JP5221928B2 JP2007275189A JP2007275189A JP5221928B2 JP 5221928 B2 JP5221928 B2 JP 5221928B2 JP 2007275189 A JP2007275189 A JP 2007275189A JP 2007275189 A JP2007275189 A JP 2007275189A JP 5221928 B2 JP5221928 B2 JP 5221928B2
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- 238000000034 method Methods 0.000 title claims description 75
- 229910021420 polycrystalline silicon Inorganic materials 0.000 title claims description 41
- 238000001312 dry etching Methods 0.000 title claims description 32
- 229920005591 polysilicon Polymers 0.000 title description 38
- 229910052747 lanthanoid Inorganic materials 0.000 claims description 44
- 238000000059 patterning Methods 0.000 claims description 42
- 239000000758 substrate Substances 0.000 claims description 40
- 150000002602 lanthanoids Chemical class 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 21
- 238000007740 vapor deposition Methods 0.000 claims description 16
- 238000001039 wet etching Methods 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- -1 lanthanide chloride Chemical class 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 9
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 5
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 150000001805 chlorine compounds Chemical class 0.000 claims description 3
- 229910052765 Lutetium Inorganic materials 0.000 claims description 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 2
- 229910052684 Cerium Inorganic materials 0.000 claims 1
- 229910052692 Dysprosium Inorganic materials 0.000 claims 1
- 229910052691 Erbium Inorganic materials 0.000 claims 1
- 229910052693 Europium Inorganic materials 0.000 claims 1
- 229910052688 Gadolinium Inorganic materials 0.000 claims 1
- 229910052689 Holmium Inorganic materials 0.000 claims 1
- 229910052779 Neodymium Inorganic materials 0.000 claims 1
- 229910052777 Praseodymium Inorganic materials 0.000 claims 1
- 229910052772 Samarium Inorganic materials 0.000 claims 1
- 229910052771 Terbium Inorganic materials 0.000 claims 1
- 229910052775 Thulium Inorganic materials 0.000 claims 1
- 229910052746 lanthanum Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002019 doping agent Substances 0.000 description 45
- 238000005530 etching Methods 0.000 description 30
- 239000000460 chlorine Substances 0.000 description 29
- 238000005660 chlorination reaction Methods 0.000 description 11
- 238000001020 plasma etching Methods 0.000 description 11
- 229910052727 yttrium Inorganic materials 0.000 description 11
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 9
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 8
- 229910052801 chlorine Inorganic materials 0.000 description 8
- 229910052732 germanium Inorganic materials 0.000 description 8
- 235000012431 wafers Nutrition 0.000 description 8
- 230000031709 bromination Effects 0.000 description 7
- 238000005893 bromination reaction Methods 0.000 description 7
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001649 bromium compounds Chemical class 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910005883 NiSi Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 150000002601 lanthanoid compounds Chemical group 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
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- H01L21/28035—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities
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- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
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- H01L21/28088—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being a composite, e.g. TiN
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- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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Description
ポリシリコンゲートは膜厚100nmを有し、80nmPECVD酸化ハードマスクを使用してパターニングする。遠紫外線レジスト(193nmの波長)を、それぞれ230nm及び77nmの膜厚を有する、有機ボトム型反射防止コーティングと組み合わせて使用する。ゲート誘電体として2nmのSiONを使用する。ポリシリコンにAl(4E15cm−2において8keV若しくは10keV)若しくはYb(4E15cm−2若しくは8E15cm−2において40keV)を注入した。ドライエッチング実験は、ラムリサーチの2300ヴェルシスエッチングチャンバにおいて、200mmウェハに対して実行した。
Ybドープされたポリシリコンのパターニングにおけるウェットエッチングの役割を証明するため、同じ照射エネルギー4keVを有する、倍加線量のYb(8E15cm−2)で2つのウェハをエッチングした。第1のウェハは、HBr及びCl2のみを含むメインエッチングを用いて完全ドライ方法を使用してエッチングした。第2のウェハは、ドライ−ウェット−ドライエッチング法を使用してエッチングした。ドライエッチング時間は両ウェハについて同じだけ維持した。特に、全ME時間(ウェットエッチング前の時間プラスウェットエッチング後の時間)は、ドライのみの方法に対して適用されたME時間と同様に保った。ドライのみの方法を使用した場合、強固なマイクロマスキングが残っており、一方中間型のウェットエッチングを適用した場合、残留物が限定されているのが観測された(図3)。これにより、酸性化水溶液が、ME工程の間に形成されたYb臭化物及び/又はYb塩化物の除去において重大な役割を果たすことが確かめられた。
Claims (12)
- ランタニド元素を含む蒸着層の少なくとも一部を下の基板上にて選択的に除去する方法であって、
基板を準備する工程と、
上記基板上に、水溶性のランタニド塩化物及び/又はランタニド臭化物を生成可能な上記ランタニド元素を含む蒸着層を形成する工程と、
上記蒸着層の少なくとも一部に、Cl及び/又はBr含有ドライエッチングプラズマをさらすことにより、上記水溶性のランタニド塩化物及び/又はランタニド臭化物を生成可能なランタニド元素を塩化物化及び/又は臭化物化させ、上記蒸着層にドープ部分を形成する工程と、
上記塩化物化及び/又は臭化物化された上記ランタニド元素を、ウォータベースのウェットエッチングステップを用いて、除去する工程と、
上記蒸着層のうちのアンドープ部分をエッチングするためドライエッチングステップを実行する工程と、を備え、
上記蒸着層のドープ部分を除去することが、構造物のパターニングに関連し、
当該方法が、上記ランタニド元素を含有する上記蒸着層を形成する工程の後に、さらに、
上記構造物を形成するため、及び上記蒸着層の一部だけを露呈させるため、感光性イメージング層を形成し、上記感光性イメージング層に上記フォトリソグラフパターンを転写する工程を備え、
さらに、上記ウェットエッチング工程の後に、
最終構造物を形成するため、ドライエッチングを実行して上記蒸着層のアンドープ部分をエッチングする工程と、
上記最終構造物に上記ランタニド元素が均一に分散されるように上記最終構造物をアニールする工程と、を備えることを特徴とする方法。 - さらに、上記蒸着層を形成する工程の後、上記蒸着層をドープして、上記蒸着層に1種以上のランタニド元素を注入する工程を備えることを特徴とする請求項1記載の方法。
- 上記ランタニド元素を、上記蒸着層の全組成において1%以下の濃度で、上記蒸着層に存在させることを特徴とする請求項1記載の方法。
- 上記の蒸着層のドープ部分を除去することがゲート構造のパターニングに関連し、上記蒸着層がゲート電極層であり、
当該方法が、上記ゲート電極層を形成する工程の前に、さらにゲート誘電体層を形成する工程を備えることを特徴とする請求項1記載の方法。 - 上記蒸着層が、ゲート電極層として使用される多結晶シリコン層であり、
上記ゲート誘電体層が、高k材料層、SiO2層若しくはSiON層であることを特徴とする請求項1記載の方法。 - 上記アニールの工程が、950℃での熱アニールを用いて実行されることを特徴とする請求項1記載の方法。
- Cl含有プラズマが、Cl2及び/又はBCl3含有プラズマであり、Br含有プラズマが、HBr及び/又はBr2含有プラズマであることを特徴とする請求項1記載の方法。
- 上記のゲート電極層のアンドープ部分をエッチングするためドライエッチングステップを実行しゲート電極を形成する工程の後に、さらに、ゲート構造を完成させるために、ドライエッチングを実行してゲート誘電体層をエッチングする工程を備えることを特徴とする請求項1記載の方法。
- 上記ランタニド元素は、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、及びLuの少なくとも1種であることを特徴とする請求項1記載の方法。
- 上記ランタニド元素がYbであることを特徴とする請求項1記載の方法。
- 上記基板がシリコンウェハであることを特徴とする請求項1記載の方法。
- ゲート構造を含む半導体装置を製造するために使用される請求項1記載の方法。
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JP2007275170A Active JP5247115B2 (ja) | 2006-10-23 | 2007-10-23 | 半導体デバイスにおけるDyScO材料の選択的除去 |
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JP2008135765A (ja) * | 2007-12-21 | 2008-06-12 | Seiko Epson Corp | 半導体装置 |
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