JP2010283136A - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 20
- 230000002265 prevention Effects 0.000 abstract description 13
- 229910052756 noble gas Inorganic materials 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 46
- 230000000052 comparative effect Effects 0.000 description 10
- 238000009832 plasma treatment Methods 0.000 description 10
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- PQDJYEQOELDLCP-UHFFFAOYSA-N trimethylsilane Chemical compound C[SiH](C)C PQDJYEQOELDLCP-UHFFFAOYSA-N 0.000 description 1
- 229940094989 trimethylsilane Drugs 0.000 description 1
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Abstract
【解決手段】半導体装置の製造方法は、半導体基板10上のSiOC膜11表面に配線12を形成する工程と、配線12が表面に形成されたSiOC膜11を希ガス、又は希ガスとN2ガスの混合ガスを含むプラズマに曝してSiOC膜11表面に緻密層14を形成する工程と、緻密層14が形成された後に、配線12の表面に形成された酸化膜13を除去する工程と、酸化膜13が除去された配線12、及び緻密層14上に絶縁膜としての拡散防止膜15を形成する工程と、を含み、酸化膜13を除去する工程から拡散防止膜15を形成する工程までが、大気に暴露されることなく行われる。
【選択図】図3
Description
本発明の実施の形態に係る半導体装置の製造方法の一例を図面を参照して説明する。まず、被処理体を準備する。
具体的には、被処理体1を処理チャンバ20内に入れない状態で、ガス流入口兼上部電極22から3MS(Tri-Methyl-Silane)/NH3/N2混合ガスを処理チャンバ20内に導入し、処理チャンバ20内の圧力を7Torrに維持する。この3MS、NH3及びN2ガスの供給速度は、それぞれ400sccm、200sccm及び2000sccmである。続いて、ガス流入口兼上部電極22及びヒーター兼下部電極23間に、600W、13.56MHzの高周波電力を印加することによって処理チャンバ20内に3MS/NH3/N2プラズマを発生させ、処理チャンバ20の内壁21にSiCN膜を形成する。
具体的には、ガス流入口兼上部電極22から希ガスとしてArガスを処理チャンバ20内に導入し、ガス流入口兼上部電極22及びヒーター兼下部電極23間に高周波電力を印加することによって処理チャンバ20内にArプラズマを発生させ、発生したArプラズマに被処理体1を5秒間曝す。SiOC膜11は、Arプラズマに曝されることによって、緻密層14が表面に形成される。続いて、高周波電力の供給とArガスの導入を停止する。
具体的には、ガス流入口兼上部電極22からNH3/N2混合ガスを処理チャンバ20内に導入し、ガス流入口兼上部電極22及びヒーター兼下部電極23間に高周波電力を印加することによって処理チャンバ20内にNH3/N2プラズマを発生させる。酸化膜13は、このNH3/N2プラズマによる還元反応によって除去される。
具体的には、この拡散防止膜15を形成する工程は、上記の内壁21にSiCN膜を形成する工程で用いた条件と同一の条件で処理チャンバ20内に3MS/NH3/N2プラズマを発生させ、SiCN膜からなる拡散防止膜15を形成する。ここで、先に配線12をNH3/N2プラズマに曝して配線12表面の酸化膜13を除去した場合は、拡散防止膜15の形成に当って処理チャンバ20内に3MSを追加導入するだけで良いため、スループットの点で有利である。
上記の実施の形態における半導体装置の製造方法によると以下の効果が得られる。
(1)SiOC膜11の表面に緻密層14を形成することによって、配線12表面の酸化膜13を除去する際のSiOC膜11の変質を抑制することができ、SiOC膜11と拡散防止膜15の密着性の劣化、配線間容量及びリーク電流の増加を防止することができる。
(2)酸化膜13を除去する工程から拡散防止膜15を形成する工程まで、又は緻密層14を形成する工程から酸化膜13を除去する工程を経て拡散防止膜15を形成する工程までを同一の処理チャンバ20内で行うので、大気に暴露されずに各工程を行うことができ、歩留まり及びスループットが向上する。また、工程間の移動に伴うパーティクル等の付着を防止することができる。
(3)処理チャンバ20の内壁21に、拡散防止膜15の組成に近いSiCN膜を形成し、SiOC膜11の緻密化の際のArプラズマによってスパッタされたSiCNをSiOC膜11上に堆積させることで、よりSiOC膜11の変質を抑制する緻密層14を形成することができ、また拡散防止膜15との密着性が向上する。
図5(a)及び(b)は、比較例に係る被処理体の要部断面図である。
上記の工程を経た被処理体3、4のSiOC膜11の比誘電率、及びSIMS(Secondary Ion-microprobe Mass Spectrometer:二次イオン質量分析計)分析によるC濃度のプロファイルを測定し、膜質変化の評価を行った。また、参照例として、実施例及び比較例と同様に、半導体基板上に比誘電率が2.6のSiOC膜が形成された被処理体を用意し、C濃度のプロファイルを測定した。
Claims (5)
- 半導体基板上のSiOC膜表面に配線を形成する工程と、
前記配線が表面に形成された前記SiOC膜を希ガス、又は希ガスとN2ガスの混合ガスを含むプラズマに曝して前記SiOC膜表面に緻密層を形成する工程と、
前記緻密層が形成された後に、前記配線の表面に形成された酸化膜を除去する工程と、
前記酸化膜が除去された前記配線、及び前記緻密層上に絶縁膜を形成する工程と、
を含み、
前記酸化膜を除去する工程から前記絶縁膜を形成する工程までが、大気に暴露されることなく行われる半導体装置の製造方法。 - 前記希ガスは、He、Ar、Ne及びXeのうち少なくとも1種のガスを含む請求項1に記載の半導体装置の製造方法。
- 前記SiOC膜をプラズマに曝す処理の前に、SiN膜、SiCN膜、SiC膜及びBN膜のうち少なくとも1つを含む膜を処理チャンバの内壁に形成する工程を含む請求項1又は2に記載の半導体装置の製造方法。
- 前記酸化膜を除去する工程は、プラズマ又は加熱により活性化されたNH3、H2及びCOのうち少なくとも1種を含むガスに前記配線を曝す工程を含む請求項1〜3のいずれか1項に記載の半導体装置の製造方法。
- 前記緻密層を形成する工程から前記絶縁膜を形成する工程までが、大気に暴露されることなく行われる請求項1〜4のいずれか1項に記載の半導体装置の製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009135118A JP5238615B2 (ja) | 2009-06-04 | 2009-06-04 | 半導体装置の製造方法 |
US12/726,138 US20100311240A1 (en) | 2009-06-04 | 2010-03-17 | Method of manufacturing a semiconductor device |
US13/948,327 US8993440B2 (en) | 2009-06-04 | 2013-07-23 | Method of manufacturing a semiconductor device with processes carried out without atmospheric exposure |
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JP2012531045A (ja) * | 2009-06-22 | 2012-12-06 | アプライド マテリアルズ インコーポレイテッド | ホウ素膜界面技術 |
JP2015122449A (ja) * | 2013-12-24 | 2015-07-02 | 株式会社ジャパンディスプレイ | 基板装置の製造方法 |
JP2017183489A (ja) * | 2016-03-30 | 2017-10-05 | 株式会社日立国際電気 | 半導体装置の製造方法、基板処理装置およびプログラム |
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US9312137B2 (en) * | 2013-10-31 | 2016-04-12 | Intermolecular, Inc. | Reduction of native oxides by annealing in reducing gas or plasma |
EP3809451A1 (en) * | 2013-11-08 | 2021-04-21 | Renesas Electronics Corporation | Semiconductor device |
US9240315B1 (en) * | 2014-10-10 | 2016-01-19 | Applied Materials, Inc. | CVD oxide surface pre-conditioning by inductively coupled O2 plasma |
KR102616489B1 (ko) | 2016-10-11 | 2023-12-20 | 삼성전자주식회사 | 반도체 장치 제조 방법 |
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US20130309866A1 (en) | 2013-11-21 |
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US20100311240A1 (en) | 2010-12-09 |
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