JP4930095B2 - ウエットエッチング方法および半導体装置の製造方法 - Google Patents
ウエットエッチング方法および半導体装置の製造方法 Download PDFInfo
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Description
エッチング液に対象物を浸漬させるための浸漬槽またはエッチング液を対象物に向けて吐出するためのスプレー装置と、
当該エッチング中に当該対象物にレーザ光を照射するためのレーザ光照射装置と
を含んでなるウェットエッチング装置が提供される。
分光エリプソメータを用いて分光エリプソメトリ法で膜厚を測定し、エッチングの前後で膜厚を比較して算出した。レーザ光の照射によりエッチング速度が増大することは、その光の当たる方向におけるエッチング速度が選択的に増大したことを意味する。すなわち、エッチングの異方性が増大したことを意味する。このことにより、ウエットエッチングにおける対象物の損傷を抑制し、きれいなエッチング形状を得ることができるようになる。
エッチング後の断面形状をSEM(走査電子顕微鏡)で観察を行うことにより測定した。具体的には、エッチング部分を劈開し、図18のXの長さをSEMで測定した。エッチング最大幅を小さく抑えることができることは、エッチングの異方性が増大したことを意味する。このことにより、ウエットエッチングにおける対象物の損傷を抑制し、きれいなエッチング形状を得ることができるようになる。
誘電率は水銀プローバ(CVmap92A、Four Dimensions Inc.)で測定した容量から算出した。なお、装置や素子全体の比誘電率である実効比誘電率の測定には、プレシジョンLCRメータ(4284A、Agilent Technologies)を使用した。
下記の構造を有するモノマーから作製された、ビニル基を含むケイ素含有化合物からなる比誘電率2.4の塗布型低誘電率絶縁材料を、Siにイオンドープした低抵抗基板上に250nmの膜厚になるようスピンコートし、250℃、3分でプリベークを行った後、N2雰囲気の電気炉にて400℃、30分の条件でキュアを行った。
その後、前記のように成膜したサンプルをエッチング液に浸漬し、投影レンズを水を溶媒とするアルカリエッチング液に接触させ、投影レンズを介してレーザ光を照射し、エッチング速度を測定した。Arガスレーザを用いたものをサンプル2、KrFレーザを用いたものをサンプル3、ArFレーザを用いたものをサンプル4、Kr2レーザを用いたものをサンプル5とした。レーザ光を照射せずに同様の実験を行ったものをサンプル1とした。また、比較用に、ビニル基がない点以外は上記のビニル基を含むケイ素含有化合物と類似した、下記の構造を有するモノマーから作製された、ビニル基を含まないケイ素含有化合物からなる、比誘電率2.6の塗布型低誘電率絶縁材料を、上記と同じ低抵抗基板上に250nmの膜厚になるようスピンコートし、250℃、3分でプリベークを行った後、N2雰囲気の電気炉にて400℃、30分の条件でキュアを行った後、サンプル3と同様の処理を行ったものをサンプル6とした。
いずれも膜厚が200nmになるまでエッチングを行った。得られたエッチング速度を下記に示す。
実施例1と同じビニル基を含むケイ素含有化合物からなる比誘電率2.4の塗布型低誘電率絶縁材料を、実施例1と同じ基板上に250nmの膜厚になるようスピンコートし、250℃、3分でプリベークを行った後、N2雰囲気の電気炉にて400℃、30分の条件でキュアを行った。このサンプル上にレジストを、パターン幅70nmでパターニングした。その後、このサンプルをエッチング液に浸漬し、投影レンズを、水を溶媒とするアルカリエッチング液に接しさせ、投影レンズを介してレーザ光を照射し、エッチング速度を測定した。Arガスレーザを用いたものをサンプル2’、KrFレーザを用いたものをサンプル3’、ArFレーザを用いたものをサンプル4’、Kr2レーザを用いたものをサンプル5’とした。レーザ光ではなく水銀ランプを用いたものをサンプル6’とした。レーザ光を照射せずに同様の実験を行ったものをサンプル1’とした。絶縁膜を100nmエッチングしたときの最大幅を比較した。結果を表2に示す。なお、エッチング液は常時撹拌し、レーザ光は連続照射した。
実施例1で用いたサンプル3,4,5について、比誘電率を測定した。結果を表3に示す。表3中、「ベタ膜」と記載されているのは、エッチング処理前のサンプルを意味する。
投影レンズを水と接触させない以外は実施例1,2と同様にし、KrFレーザを用いたものをサンプルとして処理した。得られたエッチング速度は、3.7nm/秒、エッチング最大幅は178.5nmであった。
図1に本発明に関わる多層配線実施例の作製法を示す。まず、素子間分離膜2で分離され、ソース拡散層5aとドレイン拡散層5b、サイドウォール絶縁膜3を有するゲート電極4を形成したトランンジスタ層が形成された(図1)Siウェハ1に層間絶縁膜6(リンガラス)、ストッパ膜7を形成し(図2)、電極取り出し用のコンタクトホールを形成した(図3)。
実施例5のエッチング工程において、ウエットエッチングを採用せず、CF4/CHF3ガスを原料としたFプラズマによりエッチングを行った以外は全く同様にして3層配線を形成した。試作した多層配線の櫛歯パターンを用いて配線間容量測定を行ったところ、実効比誘電率は3.7であった。
エッチング液を使用して対象物をエッチングするウエットエッチング方法において、当該エッチング中に当該対象物にレーザ光を照射する、ウエットエッチング方法。
前記対象物が半導体装置の一部である、付記1に記載のウエットエッチング方法。
前記対象物が絶縁膜である、付記1または2に記載のウエットエッチング方法。
前記対象物がLSI層間絶縁膜である、付記1〜3のいずれかに記載のウエットエッチング方法。
前記レーザ光の照射をレンズを介して行う、付記1〜4のいずれかに記載のウエットエッチング方法。
前記エッチング液が前記レンズと接触している、付記5に記載のウエットエッチング方法。
前記対象物を構成する材料が不飽和結合を有する、付記1〜6のいずれかに記載のウエットエッチング方法。
前記絶縁膜の比誘電率が2.7以下である、付記3〜7のいずれかに記載のウエットエッチング方法。
前記レーザ光の波長が150nm〜400nmの範囲にある、付記1〜8のいずれかに記載のウエットエッチング方法。
前記レーザ光がArFレーザ光、KrFレーザ光、KrClレーザ光、Nd:YAG第4高調波レーザ光およびNd:YAG第5高調波レーザ光からなる群から選ばれたものである、付記9に記載のウエットエッチング方法。
エッチング液を使用して対象物をエッチングするためのウェットエッチング装置であって、
エッチング液に対象物を浸漬させるための浸漬槽またはエッチング液を対象物に向けて吐出するためのスプレー装置と、
当該エッチング中に当該対象物にレーザ光を照射するためのレーザ光照射装置と
を含んでなるウェットエッチング装置。
更にレンズを含んでなり、前記レーザ光の照射をレンズを介して行うことのできる、付記11に記載のウエットエッチング装置。
更に、前記レンズを前記エッチング液と接触して置くことができる、付記12に記載のウエットエッチング装置。
前記対象物が絶縁膜である、付記11〜13に記載のウエットエッチング装置。
前記対象物がLSI層間絶縁膜である、付記14に記載のウエットエッチング装置。
前記対象物を構成する材料が不飽和結合を有する、付記11〜15のいずれかに記載のウエットエッチング装置。
前記絶縁膜の比誘電率が2.7以下である、付記14〜16のいずれかに記載のウエットエッチング装置。
前記レーザ光の波長が150nm〜400nmの範囲にある、付記11〜17のいずれかに記載のウエットエッチング装置。
前記レーザ光がArFレーザ光、KrFレーザ光、KrClレーザ光、Nd:YAG第4高調波レーザ光およびNd:YAG第5高調波レーザ光からなる群から選ばれたものである、付記18に記載のウエットエッチング装置。
付記1〜10のいずれかに記載のウエットエッチング方法を用いて溝形成を行うことを含む、半導体装置の製造方法。
2 素子間分離膜
3 サイドウォール絶縁膜
4 ゲート電極
5a ソース拡散層
5b ドレイン拡散層
6 層間絶縁膜
7 ストッパ膜
8 TiN(バリア膜)
9 導体プラグ(W)
10 低誘電率被膜(配線分離絶縁膜)
11 TEOS−SiO2膜
12 TiN
13 Cu
14 SiN膜
15 SiOC膜
16 SiN膜
17 低誘電率被膜(配線分離絶縁膜)
18 TEOS−SiO2膜
19 TiN
20 Cu層
181 レジスト
182 絶縁膜
183 絶縁膜の下の層
Claims (7)
- エッチング液を使用して対象物をエッチングするウエットエッチング方法において、
当該対象物がビニル基を含むケイ素含有化合物から構成され、
当該エッチング中に当該対象物にレーザ光を照射する、
ウエットエッチング方法。 - 前記対象物が半導体装置の一部である、請求項1に記載のウエットエッチング方法。
- 前記対象物が絶縁膜である、請求項1または2に記載のウエットエッチング方法。
- 前記レーザ光の照射をレンズを介して行う、請求項1〜3のいずれかに記載のウエットエッチング方法。
- 前記エッチング液が前記レンズと接触している、請求項4に記載のウエットエッチング方法。
- 前記絶縁膜の比誘電率が2.7以下である、請求項3〜5のいずれかに記載のウエットエッチング方法。
- 請求項1〜6のいずれかに記載のウエットエッチング方法を用いて溝形成を行うことを含む、半導体装置の製造方法。
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JP2007042303A JP4930095B2 (ja) | 2007-02-22 | 2007-02-22 | ウエットエッチング方法および半導体装置の製造方法 |
US12/035,832 US8449787B2 (en) | 2007-02-22 | 2008-02-22 | Method for wet etching while forming interconnect trench in insulating film |
US13/873,849 US20130233489A1 (en) | 2007-02-22 | 2013-04-30 | Apparatus for wet etching while forming interconnect trench in insulating film |
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TWI449958B (zh) * | 2010-06-30 | 2014-08-21 | Luxnet Corp | 微型透鏡之製造方法 |
US9276057B2 (en) * | 2014-01-27 | 2016-03-01 | United Microelectronics Corp. | Capacitor structure and method of manufacturing the same |
CN104759753B (zh) * | 2015-03-30 | 2016-08-31 | 江苏大学 | 多系统自动化协调工作提高激光诱导空化强化的方法 |
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JPS6148581A (ja) * | 1984-08-10 | 1986-03-10 | Toshiba Corp | レ−ザ併用ケミカルエツチング方法 |
JP2595997B2 (ja) | 1987-10-13 | 1997-04-02 | 富士通株式会社 | 半導体装置の製造方法 |
JPH03253025A (ja) * | 1990-03-02 | 1991-11-12 | Nippon Telegr & Teleph Corp <Ntt> | 加工基板及びシリコン異方性エッチング方法 |
US5057184A (en) * | 1990-04-06 | 1991-10-15 | International Business Machines Corporation | Laser etching of materials in liquids |
US6009888A (en) * | 1998-05-07 | 2000-01-04 | Chartered Semiconductor Manufacturing Company, Ltd. | Photoresist and polymer removal by UV laser aqueous oxidant |
JP2001172416A (ja) * | 1999-12-15 | 2001-06-26 | Toray Ind Inc | エッチング方法 |
KR100357981B1 (ko) * | 2000-06-29 | 2002-10-25 | 삼성전자 주식회사 | 회절격자 제조장치 및 그 제조방법 |
US6555017B1 (en) * | 2000-10-13 | 2003-04-29 | The Regents Of The University Of Caliofornia | Surface contouring by controlled application of processing fluid using Marangoni effect |
US6720522B2 (en) * | 2000-10-26 | 2004-04-13 | Kabushiki Kaisha Toshiba | Apparatus and method for laser beam machining, and method for manufacturing semiconductor devices using laser beam machining |
JP2003297802A (ja) * | 2002-03-29 | 2003-10-17 | Tokyo Electron Ltd | 基板処理装置及び基板処理方法 |
JP3776092B2 (ja) * | 2003-03-25 | 2006-05-17 | 株式会社ルネサステクノロジ | エッチング装置、エッチング方法および半導体装置の製造方法 |
JP2004335847A (ja) | 2003-05-09 | 2004-11-25 | Mitsubishi Electric Corp | 半導体集積回路ウエハの製造方法 |
WO2007058284A1 (ja) * | 2005-11-18 | 2007-05-24 | Mitsubishi Gas Chemical Company, Inc. | ウエットエッチング方法及びウエットエッチング装置 |
US20080067159A1 (en) * | 2006-09-19 | 2008-03-20 | General Electric Company | Laser processing system and method for material processing |
US20080073321A1 (en) * | 2006-09-22 | 2008-03-27 | Tokyo Electron Limited | Method of patterning an anti-reflective coating by partial etching |
US7851232B2 (en) * | 2006-10-30 | 2010-12-14 | Novellus Systems, Inc. | UV treatment for carbon-containing low-k dielectric repair in semiconductor processing |
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US20080206999A1 (en) | 2008-08-28 |
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JP2008205369A (ja) | 2008-09-04 |
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