JP2020126999A - 基板を処理する方法および装置 - Google Patents
基板を処理する方法および装置 Download PDFInfo
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- JP2020126999A JP2020126999A JP2020001754A JP2020001754A JP2020126999A JP 2020126999 A JP2020126999 A JP 2020126999A JP 2020001754 A JP2020001754 A JP 2020001754A JP 2020001754 A JP2020001754 A JP 2020001754A JP 2020126999 A JP2020126999 A JP 2020126999A
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- 238000000034 method Methods 0.000 title claims abstract description 91
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- 238000000151 deposition Methods 0.000 claims description 60
- 238000005530 etching Methods 0.000 claims description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 238000005229 chemical vapour deposition Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
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- 238000001900 extreme ultraviolet lithography Methods 0.000 description 8
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- 238000009616 inductively coupled plasma Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 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
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- 229910021341 titanium silicide Inorganic materials 0.000 description 1
Classifications
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Abstract
Description
以下に説明する一実施形態に係る方法は、LCDUおよびX−Y CD制御性を改善する。図1は、一実施形態に係る基板処理方法の一例のフローチャートである。図2は、一実施形態に係る基板処理方法の一例を説明するための概略図である。
図1の処理中、異方性デポジションがステップS103において実行される。次に、異方性デポジションの詳細について説明する。
異方性デポジションに寄与する要因は種々存在する。異方性デポジションが実行されるプラズマ処理容器内の分圧、付着係数、基板温度、電荷密度すなわちイオン密度等である。
次に、本実施形態に係るマスク増強の効果について説明する。上記のように、マスク103がEUVLにより形成されたフォトレジストマスクである場合、マスク103の厚みは薄くなりがちである。たとえば、マスク103の厚みは約50ナノメートル程度である。このため、マスク103上からエッチングを実行するとマスク103がすぐにエッチングによって消滅してしまう。
異方性デポジションによりマスク高を増加させた場合、マスクのエッチング選択比も改善される。
図10Aは、一実施形態に係る例示的処理と比較処理とにより得られたパターン例を示す図である。図10Bは、図10Aの実験結果を表したグラフである。
本発明者らは、EUVマスクに対して均衡プラズマ処理を実行したとき、LCDUが改善されることを確認した。図11は、一実施形態に係る例示的処理により得られたLCDU改善効果を示す図である。
保護膜200(図1のステップS102および図2(b)を参照)は、DCSを用いて形成してもよい。図12はDCSのメカニズムを説明するための図である。DCSは、プラズマ処理容器内の上部電極に負の直流電圧を印加して、上部電極に含有されるシリコン等の材料を上部電極下に配置された基板の上に落下させることで基板を処理する手法である。DCSはたとえば、米国特許出願公開2018/0151333号明細書に記載の手法により実行できる。
実施形態に係る異方性デポジションを達成するため、異方性デポジションを実行するプラズマ処理装置は好ましくは、上部構造物すなわち上部電極に高周波電力を供給する機構を含む。プラズマ生成のための高周波電圧が下部構造物(すなわち下部電極)から供給されるとき、堆積物はパターンの底部に輸送されがちである。このため、本実施形態の異方性デポジションを実現するためには、誘導結合プラズマ(ICP)装置、上部電極に高周波電力を印加する形式の容量結合プラズマ(CCP)装置等を用いてもよい。
処理容器と、
前記処理容器内に設けられる基板支持台と、
前記処理容器内にプラズマを生成するプラズマ生成部と、
前記処理容器に接続されるガス供給部と、
制御部と、
を備える、基板を処理する装置であって、
前記制御部は、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
前記マスク上に保護膜を形成する工程と、
異方性デポジションを実行して、前記保護膜の上部に堆積層を形成する工程と、
を含む各工程を前記装置の各部に実行させる、装置。
処理容器と、
前記処理容器内に設けられる基板支持台と、
前記処理容器内にプラズマを生成するプラズマ生成部と、
前記処理容器に接続されるガス供給部と、
制御部と、
を備える、基板を処理する装置であって、
前記制御部は、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
CxHyFzと、N2、O2、H2およびFの少なくとも一つと、を所定の割合で含有する処理ガスからプラズマを生成し、前記プラズマに前記基板を暴露する工程と、を含み、
前記CxHyFzにおいて、
(i)xは1以上の自然数、yは1以上の自然数、かつ、zはゼロまたは1以上の自然数、または、
(ii)xは1以上の自然数、yはゼロまたは1以上の自然数、かつ、zは1以上の自然数
である方法を、前記装置の各部に実行させる、装置。
2,12 プラズマ
3 上部電極
4,14 下部電極
5,15 静電チャック
6,7,16,17 RF電源
8,18 ガスソース
9,19 排気装置
10 可変直流電源
20 誘導体(コイル)
21 誘電体窓
100 基板
101 下地層
102 反射防止膜
103 マスク
200 保護膜
Claims (18)
- プラズマ処理容器内で基板を処理する方法であって、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
前記マスク上に保護膜を形成する工程と、
異方性デポジションを実行して、前記保護膜の上部に堆積層を形成する工程と、
を含む方法。 - 前記プラズマ処理容器上に上部電極を有し、
前記保護膜を形成する工程は、
前記上部電極に直流電流を印加して、前記基板の上方に配置されたターゲットをスパッタリングする、または、
原子層堆積(ALD)、物理蒸着(PVD)および化学蒸着(CVD)の少なくとも一つを実行する
ことによりシリコンを含有する前記保護膜を形成する、請求項1に記載の方法。 - 前記保護膜を形成する工程は、前記マスクの上面および側面に少なくとも一原子層の前記保護膜を形成する、請求項1に記載の方法。
- 前記マスクは有機膜でできており、
前記保護膜は、無機材料または金属でできている、請求項1に記載の方法。 - 前記マスクは、金属を含有する、請求項1に記載の方法。
- 前記マスクは、タングステン(W)またはチタン(Ti)を含有する、請求項5に記載の方法。
- 前記堆積層を形成する工程は、
CxHyと、N2,O2,H2およびFのうち少なくとも一つを含有する処理ガスからプラズマを生成して前記基板を前記プラズマに暴露して異方性デポジションを実行する、請求項1に記載の方法。 - 前記堆積層を形成する工程の後に、デポジションを生じる第1ガスのプラズマと、スパッタリングおよびエッチングのうち少なくとも一つを生じる第2ガスのプラズマとに、前記基板を連続的に暴露することで、前記基板上のパターン寸法を調整する工程をさらに含む、請求項1に記載の方法。
- 前記第1ガスはシリコン(Si)、CXHYFZ、および、N2またはO2を含有し、
前記第2ガスはHe、Ne、Ar、Kr、XeおよびN2のうち少なくとも一つを含有する、請求項8に記載の方法。 - 前記第1ガスは、シリコン(Si)、CxHyFz、および、N2またはO2を含有し、
前記第2ガスは、CxFyHzを含有する、請求項8に記載の方法。 - 前記堆積層を形成する工程の後に、前記堆積層が形成された前記マスクを介して前記下地層をエッチングする工程をさらに含む、請求項1に記載の方法。
- 前記堆積層を形成する工程および前記エッチングする工程は、同一のプラズマ処理容器内で、または、同一のシステム内で実行される、請求項11に記載の方法。
- プラズマ処理容器内で基板を処理する方法であって、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
CxHyFzと、N2、O2、H2およびFの少なくとも一つと、を所定の割合で含有する処理ガスからプラズマを生成し、前記プラズマに前記基板を暴露する工程と、を含み、
前記CxHyFzにおいて、
(i)xは1以上の自然数、yは1以上の自然数、かつ、zはゼロまたは1以上の自然数、または、
(ii)xは1以上の自然数、yはゼロまたは1以上の自然数、かつ、zは1以上の自然数
である方法。 - 前記所定の割合は、前記基板を暴露する工程においてエッチングとデポジションとが実質的に相殺しあう割合である、請求項13に記載の方法。
- プラズマ処理容器内で基板を処理する方法であって、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
CxHyFzと、N2、O2、H2およびFの少なくとも一つと、を所定の割合で含有する処理ガスのプラズマに前記基板を暴露する工程と、
前記マスク上に保護膜を形成する工程と、
異方性デポジションを実行して、前記保護膜の上部に堆積層を形成する工程と、を含み、
前記CxHyFzにおいて、
(i)xは1以上の自然数、yは1以上の自然数、かつ、zはゼロまたは1以上の自然数、または、
(ii)xは1以上の自然数、yはゼロまたは1以上の自然数、かつ、zは1以上の自然数
である方法。 - 前記堆積層を形成する工程の後に、前記基板上のパターン寸法を調整する工程をさらに含む、請求項15に記載の方法。
- 処理容器と、
前記処理容器内に設けられる基板支持台と、
前記処理容器内にプラズマを生成するプラズマ生成部と、
前記処理容器に接続されるガス供給部と、
制御部と、
を備える、基板を処理する装置であって、
前記制御部は、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
前記マスク上に保護膜を形成する工程と、
異方性デポジションを実行して、前記保護膜の上部に堆積層を形成する工程と、
を含む各工程を前記装置の各部に実行させる、装置。 - 処理容器と、
前記処理容器内に設けられる基板支持台と、
前記処理容器内にプラズマを生成するプラズマ生成部と、
前記処理容器に接続されるガス供給部と、
制御部と、
を備える、基板を処理する装置であって、
前記制御部は、
エッチング対象の下地層と前記下地層上にマスクを有する基板を提供する工程と、
CxHyFzと、N2、O2、H2およびFの少なくとも一つと、を所定の割合で含有する処理ガスからプラズマを生成し、前記プラズマに前記基板を暴露する工程と、を含み、
前記CxHyFzにおいて、
(i)xは1以上の自然数、yは1以上の自然数、かつ、zはゼロまたは1以上の自然数、または、
(ii)xは1以上の自然数、yはゼロまたは1以上の自然数、かつ、zは1以上の自然数
である方法を、前記装置の各部に実行させる、装置。
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US11495469B2 (en) | 2022-11-08 |
US20200251344A1 (en) | 2020-08-06 |
JP2024026599A (ja) | 2024-02-28 |
KR20200095393A (ko) | 2020-08-10 |
US20210111034A1 (en) | 2021-04-15 |
US20230035391A1 (en) | 2023-02-02 |
JP7414535B2 (ja) | 2024-01-16 |
TW202045749A (zh) | 2020-12-16 |
US10886136B2 (en) | 2021-01-05 |
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