JP2017222928A - 表面処理による選択的堆積 - Google Patents
表面処理による選択的堆積 Download PDFInfo
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- JP2017222928A JP2017222928A JP2017107853A JP2017107853A JP2017222928A JP 2017222928 A JP2017222928 A JP 2017222928A JP 2017107853 A JP2017107853 A JP 2017107853A JP 2017107853 A JP2017107853 A JP 2017107853A JP 2017222928 A JP2017222928 A JP 2017222928A
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- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- MNWRORMXBIWXCI-UHFFFAOYSA-N tetrakis(dimethylamido)titanium Chemical compound CN(C)[Ti](N(C)C)(N(C)C)N(C)C MNWRORMXBIWXCI-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910006400 μ-Cl Inorganic materials 0.000 description 1
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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Abstract
Description
本出願は、2016年5月31日に出願された米国仮特許出願第62/343,753号に関連し、且つ、優先権を主張する。その全内容は参照により本明細書に組み込まれる。
本発明は、半導体処理及び半導体デバイスに関し、且つ、より詳細には、表面処理を用いて異なる材料の上に選択的に堆積させる方法に関する。
14nm技術ノードではデバイスサイズが小さくなるにつれて、製造の複雑さが増している。半導体デバイスを製造するためのコストもまた増加しており、且つ、費用対効果の高いソリューション及び革新が必要とされている。より小型のトランジスタが製造されるにつれて、パターン化されたフィーチャの限界寸法(CD)又は解像度は、生産するのがより困難になってきている。自己整合パターニングは、EUV導入後であってもコスト効率の高いスケーリングが継続できるように、オーバーレイ駆動(overlay-driven)パターニングに置き換わることができる。低減したバラツキを可能にし、スケーリングを拡張し、且つ、CD及びプロセス制御を強化するパターニングオプションが必要である。薄膜の選択的堆積は、高度にスケーリングされた技術ノードにおけるパターニングの重要なステップである。異なる材料表面に選択的な膜堆積を提供する新しい堆積方法が必要とされる。必要とされる新しい方法は、誘電材料オン誘電材料(DoD)、誘電材料オン金属(metals)(DoM)、金属オン金属(MoM)、金属オン誘電材料(MoD)、及び金属オンケイ素(MOS)の選択的堆積を含む。
第1の表面を有する第1の材料層と、第2の表面を有する第2の材料層と、を含む基板を提供するステップと、
前記第2の表面をヒドロキシル基で終結させる化学酸化物除去プロセスを実施するステップと、
をふくむ。当該方法はさらに、
疎水性官能基を含むプロセスガスに暴露することによって前記第2の表面を改質するステップであって、前記第2の表面の上の水酸基を前記疎水性官能基で置換する、改質するステップと、及び
前記基板を堆積ガスに暴露することによって、改質された第2の表面の上ではなく、前記第1の表面の上に金属含有層を選択的に堆積するステップと、
を含む。
本発明の実施形態は、表面処理及びその後の堆積プロセスを用いて異なる材料の上に選択的に堆積させる方法を提供する。選択的堆積は、他の材料への迅速かつ効果的な堆積をもたらしつつ、堆積が望ましくない材料の表面の上でのインキュベーション時間の増加をもたらす、表面処理によって達成され得る。この改善された堆積選択性は、材料層を含む半導体デバイスにおける線間(line-to-line)破壊及び電気漏れ性能に対するより大きいマージンを提供する。
本発明の実施形態は、原子層堆積(atomic layer deposition,ALD)及び化学気相蒸着(chemical vapor deposition,CVD)などの表面に敏感な気相蒸着プロセス、及びその変形、並びにスピンオン堆積に非常に有益である。
第1の表面を有する第1の材料層と、第2の表面を有する第2の材料層と、を含む基板を提供するステップと、
前記第2の表面をヒドロキシル基で終結させる化学酸化物除去(chemical oxide removal,COR)プロセスを実施するステップと、
を含む。当該方法はさらに、
疎水性官能基を含むプロセスガスに暴露することによって前記第2の表面を改質するステップであって、前記第2の表面の上の水酸基を前記疎水性官能基で置換する、改質するステップと、及び
前記基板を堆積ガスに暴露することによって、改質された第2の表面の上ではなく、前記第1の表面の上に金属含有層を選択的に堆積するステップと、を含む。CORプロセスは、ドライエッチングプロセス又はウェットエッチングプロセスを含むことができる。ドライエッチングプロセスは、例えば、HF系であり得る。本発明者らは、CORプロセスが誘電材料の表面のその後の表面改質を大幅に強化し、改質誘電体表面へのその後の堆積の優れた遮断をもたらすことを発見した。いくつかの例では、改質は、low−k修復(low−k restoration,LKR)又は基板の上の自己組織化単分子膜(self−assembled monolayers,SAM)の形成などのプロセスを含み得る。
基板上の露出した表面層を化学的に変更するためのCORモジュール、
基板上の化学的に変化した表面層を熱処理するポスト熱処理(post heat treatment,PHT)モジュール、及び
PHTモジュールとCORモジュールとの間に結合された分離アセンブリ(isolation assembly)、
を含む。一例では、処理圧力が約1mTorrから約100mTorrの範囲であり得、例えば約2mTorrから約25mTorrの範囲であり得るCORモジュールにおいて、HF及びNH3を含むプロセスガスに基板を暴露することができる。プロセスガス流量(flow rates)は、各化学種(species)について約1〜約200sccmの範囲であり得、例えば、約10sccm〜約100sccmの範囲であり得る。加えて、CORモジュールは、30℃〜100℃の範囲の温度に加熱することができ、及び例えば、温度は約40℃であり得る。加えて、プロセスガスをCORモジュールに送るためのガス分配システムは、約40℃〜約100℃の範囲の温度に加熱することができ、及び例えば、温度は約50℃であり得る。基板は、約10℃〜約50℃の範囲の温度に維持することができ、及び例えば基板温度は約20℃にであり得る。
表1
_________________________________
トリエチルシラザン SiC6H17N
トリプロピルシラザン SiC9H23N
トリフェニルシラザン SiC18H17N
テトラメチルジシラザン Si2C4H15N
ヘキサメチルジシラザン Si2C6H19N
ヘキサエチルジシラザン Si2C12H31N
ヘキサフェニルジシラザン Si2C36H31N
ヘプタメチルジシラザン Si2C7H21N
ジプロピル−テトラメチルジシラザン Si2C10H27N
ジ−n−ブチル−テトラメチルジシラザン Si2C12H31N
ジ−n−オクチル−テトラメチルジシラザン Si2C20H47N
トリエチル−トリメチルシクロトリシラザン Si2C9H27N3
ヘキサメチルシクロトリシラザン Si3C6H21N3
ヘキサエチルシクロトリシラザン Si3C12H33N3
ヘキサフェニルシクロトリシラザン Si3C36H33N3
オクタメチルシクロテトラシラザン Si4C8H28N4
オクタエチルシクロテトラシラザンSi4C16H44N4
テトラエチル−テトラメチルシクロテトラシラザン Si4C12H36N4
シアノプロピルメチルシラザン SiC5H10N2
テトラフェニルジメチルジシラザン Si2C26H27N
ジフェニル−テトラメチルジシラザン Si2C16H23N
トリビニル−トリメチルシクロトリシラザン Si3C9H21N3
テトラビニルテトラメチルシクロテトラシラザン Si4C12H28N4
ジビニル−テトラメチルジシラザン Si2C8H19N
_________________________________
Ru3(CO)12及びCOキャリアガスの暴露を用いるCVDによって、Si層の上にRu金属層を選択的に堆積させた。断面後方散乱電子(backscattered electron,BSE)画像は、Si層の上の選択的CVD Ru金属層を示す。その後、TBTEMTとNH3の交互ガス暴露を用いてTaN層を堆積させた。同様に、TEMATとNH3の交互ガス暴露を用いてTiN層を堆積させた。隆起したSiフィーチャの上の選択的なTaN及びTiNの堆積を検証するために、走査型電子顕微鏡、BSE及び透過型電子顕微鏡(TEM)を使用した。
103 第1の表面
104 Si層
105 第2の表面
106 自然酸化物層
108 −OH基
110 疎水性官能基
112 金属含有層
Claims (20)
- 基板を処理する方法であって、
第1の表面を有する第1の材料層と、第2の表面を有する第2の材料層と、を含む基板を提供するステップと、
前記第2の表面をヒドロキシル基で終結させる化学酸化物除去プロセスを実施するステップと、
疎水性官能基を含むプロセスガスに暴露することによって前記第2の表面を改質するステップであって、前記第2の表面の上の水酸基を前記疎水性官能基で置換する、改質するステップと、及び
前記基板を堆積ガスに暴露することによって、改質された第2の表面の上ではなく、前記第1の表面の上に金属含有層を選択的に堆積するステップと、
を含む、方法。 - 前記第1の材料層はシリコン層を含み、且つ、前記第2の材料層は誘電体層を含む、請求項1に記載の方法。
- 前記実施するステップは、前記シリコン層及び前記誘電体層から酸化物層を除去する、請求項2に記載の方法。
- 前記誘電体層が、SiO、SiN、SiOH、SiCOH、high−k材料、又はlow−k材料のうちの1以上を含む、請求項2に記載の方法。
- 前記第1の材料層は、初期金属含有層を含み、且つ、前記第2の材料層は、誘電体層を含む、請求項1に記載の方法。
- 前記実施するステップは、前記初期金属含有層及び前記誘電体層から酸化物層を除去する、請求項5に記載の方法。
- 前記誘電体層が、SiO、SiN、SiOH、SiCOH、high−k材料、又はlow−k材料のうちの1以上を含む、請求項5に記載の方法。
- 前記初期金属含有層は、Cu、Al、Ta、TaN、Ti、TiN、W、TiW、Ru、Co、Mo、W、Pt、Ir、Rh、又はRe、又はこれらの組み合わせを含有する、金属層又は金属化合物層を含む、請求項5に記載の方法。
- 前記第1の材料層は、初期金属含有層を含み、且つ、前記第2の材料層は、シリコン層を含む、請求項1に記載の方法。
- 前記実施するステップは、前記初期金属含有層及び前記シリコン層から酸化物層を除去する、請求項9に記載の方法。
- 前記酸化物層が、前記基板の上に堆積された自然酸化物層又は化学酸化物層を含む、請求項9に記載の方法。
- 前記初期金属含有層は、Cu、Al、Ta、TaN、Ti、TiN、W、TiW、Ru、Co、Mo、W、Pt、Ir、Rh、又はRe、又はこれらの組み合わせを含有する、金属層又は金属化合物層を含む、請求項9に記載の方法。
- 前記プロセスガスが、アルキルシラン、アルコキシシラン、アルキルアルコキシシラン、アルキルシロキサン、アルコキシシロキサン、アルキルアルコキシシロキサン、アリールシラン、アシルシラン、アリールシロキサン、アシルシロキサン、シラザン、又はそれらのいずれの組み合わせから選択されるケイ素含有ガスを含む、請求項1に記載の方法。
- 前記金属含有層は、金属層又は金属化合物層を含む、請求項1に記載の方法。
- 前記金属層及び前記金属化合物層は、Al、Ta、TaN、Ti、TiN、W、TiW、Ru、Co、Mo、W、Pt、Ir、Rh又はRe、又はそれらの組み合わせを含有する、請求項14に記載の方法。
- 前記化学酸化物除去プロセスが、前記基板をHF及びNH3ガスに暴露することを含む、請求項1に記載の方法。
- 基板を処理する方法であって、
第1の表面を有するシリコン層と、第2の表面を有するSiOx層と、を含む基板を提供するステップと、
前記第2の表面をヒドロキシル基で終結させる化学酸化物除去プロセスを実施するステップと、
疎水性官能基を含むプロセスガスに暴露することによって前記第2の表面を改質するステップであって、前記第2の表面の上の水酸基を前記疎水性官能基で置換する、改質するステップと、及び
前記基板を金属含有堆積ガスに暴露することによって、改質された第2の表面の上ではなく、前記第1の表面の上に金属層又は金属化合物層を選択的に堆積するステップと、
を含む、方法。 - 前記化学酸化物除去プロセスが、前記基板をHF及びNH3ガスに暴露することを含む、請求項17に記載の方法。
- 前記金属層及び前記金属化合物層は、Al、Ta、TaN、Ti、TiN、W、TiW、Ru、Co、Mo、W、Pt、Ir、Rh又はRe、又はそれらの組み合わせを含むことを特徴とする、又はそれらの組み合わせを含む、請求項17に記載の方法。
- 前記化学酸化物除去プロセスは、前記第1の表面から自然酸化膜を除去し、且つ、前記プロセスガスにより、前記改質された第2の表面のその後の反応性を高める、請求項17に記載の方法。
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KR102249346B1 (ko) | 2021-05-06 |
KR20190095212A (ko) | 2019-08-14 |
JP6827500B2 (ja) | 2021-02-10 |
US20170342553A1 (en) | 2017-11-30 |
US10378105B2 (en) | 2019-08-13 |
JP2019165256A (ja) | 2019-09-26 |
KR20170135760A (ko) | 2017-12-08 |
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