JP2005023318A - シロキサン系樹脂及びこれを用いた半導体層間絶縁膜 - Google Patents
シロキサン系樹脂及びこれを用いた半導体層間絶縁膜 Download PDFInfo
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- JP2005023318A JP2005023318A JP2004193919A JP2004193919A JP2005023318A JP 2005023318 A JP2005023318 A JP 2005023318A JP 2004193919 A JP2004193919 A JP 2004193919A JP 2004193919 A JP2004193919 A JP 2004193919A JP 2005023318 A JP2005023318 A JP 2005023318A
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- siloxane
- based resin
- carbon atoms
- insulating film
- Prior art date
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- 239000011347 resin Substances 0.000 title claims abstract description 61
- 229920005989 resin Polymers 0.000 title claims abstract description 61
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 31
- 239000011229 interlayer Substances 0.000 title claims abstract description 28
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- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 62
- 125000004432 carbon atom Chemical group C* 0.000 claims description 57
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- 125000000217 alkyl group Chemical group 0.000 claims description 27
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- 238000000034 method Methods 0.000 claims description 22
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- 150000001875 compounds Chemical class 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- 125000003118 aryl group Chemical group 0.000 claims description 13
- 125000005843 halogen group Chemical group 0.000 claims description 12
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- 230000015572 biosynthetic process Effects 0.000 abstract description 10
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- -1 aryl sulfonic acid Chemical compound 0.000 description 4
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- 238000005406 washing Methods 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
【解決手段】 本発明は、新規構造を有するシロキサン系樹脂を有機溶媒に溶かし、これを基板上にコーティングした後、熱硬化させることにより製造される半導体層間絶縁膜により上記課題を解決する。
【選択図】 なし
Description
本発明の他の側面は、前記シロキサン系樹脂を有機溶媒に溶かして組成物を形成し、前記組成物をシリコン基板上にコーティングした後、熱硬化させる段階を含む半導体層間絶縁膜の形成方法を提供する。
上記化学式(1)のY1、Y2、及びY3における炭素数1〜3のアルキル基としては、特に限定されないが、メチル基、エチル基、プロピル基、イソプロピル基などが好ましく挙げられる。前記Y1〜Y3における炭素数1〜10のアルコキシ基としては、特に限定されないが、メトキシ基、エトキシ基、プロポキシ基、ブトキシ基、ペントキシ基などが好ましく挙げられる。また、前記Y1〜Y3におけるハロゲン原子としては、特に限定されないが、フッ素原子、塩素原子、臭素原子、ヨウ素原子などが好ましく挙げられる。なかでも前記Y1〜Y3として、より好ましくはメチル基、メトキシ基などが挙げられる。
製造例1−1:モノマー(A)の合成
製造例1−2:モノマー(B)の合成
製造例1−3:シロキサン系モノマー(C)の合成
製造例1−4:シロキサン系モノマー(D)の合成
製造例1−5:シロキサン系モノマー(E)の合成
製造例1−6:シロキサン系モノマー(F)
有機基で連結されて放射状構造を有するシラン系モノマー(A)と、他のモノマー(B)、(C)、(D)、(E)、(F)及び(G)のうちいずれか一つのモノマーとをフラスコに入れ、総モノマーの15モル倍程度のテトラヒドロフランを入れてモノマーを希釈させた後、フラスコの内部温度を−78℃まで降温した。−78℃で表1に示す量の塩酸および水を入れ、反応器の温度を70℃に徐々に昇温した。その後、70℃で反応を20時間行わせた。反応溶液を分別漏斗に移した後、最初に仕込んだテトラヒドロフランと同じ量のジエチルエーテルとテトラヒドロフランを添加し、総溶媒の約1/10モル倍程度の水で3回洗浄した後、減圧下で揮発性物質を除去して白色粉末状の重合体を得た。前記方法で得た重合体を完全に澄んだ溶液になるまで少量のアセトンを入れて溶かした。この溶液から孔径0.2μmのフィルタを用いて微細な粉末及びその他の異物を除去し、澄んだ溶液部分のみを取った後、水を徐々に添加した。この際、生成された白色粉末と溶液部分(アセトンと水の混合溶液)を分離した後、0〜20℃、0.1torr減圧の下で10時間白色粉末を乾燥させ、シロキサン系樹脂(a)〜(k)を得た。それぞれのシロキサン系樹脂(a)〜(k)の合成に用いられたモノマー、酸触媒、水及び得られたシロキサン系樹脂(a)〜(k)の収量は表1の通りである。
実施例1で製造されたシロキサン系樹脂(a)〜(k)のSi−OH含量、Si−OCH3含量、およびSi−CH3含量の測定値は表2の通りである。
実施例1で製造されたシロキサン系樹脂(a)〜(k)、および、実施例1で製造されたシロキサン系樹脂(a)〜(k)に気孔形成物質としてのヘプタキス[2,3,6−トリ-O−メチル]−β−シクロデキストリンを表3に示す質量分率(wt%)で混合した組成物を、プロピレングリコールメチルエーテルアセテートに、全組成物中の固形分含有量が溶媒に対して25質量%となるように溶解させた後、混合溶液を3,000rpmで30秒間シリコン基板上にスピンコーティングした。その後、組成物がコーティングされた基板を窒素雰囲気のホットプレートで100℃にて1分間、そして250℃で1分間加熱して有機溶媒を除去した。その後、真空雰囲気中で分当たり3℃ずつ420℃まで昇温した後、420℃で1時間焼成させることにより薄膜を製造した。得られた薄膜の厚さ及び屈折率を測定した。この際、薄膜の厚さは側面計で5回測定して平均値を取り、屈折率はプリズムカプラで5回測定して平均値を取った。また、厚さ及び屈折率の均一性は基板の5箇所を測定してその差から算出した。
薄膜の誘電率を測定するために、硼素でドープされたP型のシリコン基板上にシリコン熱酸化膜を3000Åの厚さに塗布した後、金属製の蒸発器でチタニウム100Å、アルミニウム薄膜2000Å、チタニウム100Åを蒸着させ、実施例2と同様の方法によって表3に示される組成で薄膜をコーティングした。その後、電極の直径が1mmに設計されたハードマスクを用いて、1mmの直径を有する円形のチタニウム100Å、アルミニウム薄膜5000Åを蒸着してMIM(metal-insulator-metal)構造の誘電率測定用低誘電率薄膜を完成した。このような薄膜を、プローブステーション(micromanipulatior 6200 probe station)が装着されたPRECISION LCR METER(HP4284A)を用いて100kHzの周波数で静電容量を測定した。誘電率を計算するために薄膜の厚さをプリズムカプラで測定して次の計算式によって誘電率を計算した。結果を表4に示す。
硬度及び弾性率の測定は、実施例2で製造された薄膜をMTS社のナノインデンタ(nanoindenter)IIを用いて定量的に分析した。また、各サンプルに対して信頼度を確認するために、6ポイントに押込をして、その平均値からそれぞれの硬度及び弾性率を求めた。前記薄膜にナノインデンタの押込を開始した後、押込の深さが薄膜全圧の10%となったとき、薄膜の硬度及び弾性率を求めた。結果値は表5の通りである。この際、薄膜の厚さはプリズムカプラを用いて測定した。
Claims (17)
- 下記化学式(1)で表わされる放射状シラン系モノマーと、下記化学式(2)、(3)、および(4)で表わされる化合物からなる群より選択された1種以上のモノマーと、を有機溶媒の下で、酸触媒又は塩基触媒と水とを用いて、加水分解及び縮合重合されてなるシロキサン系樹脂。
- 前記化学式(1)で表わされる放射状シラン系モノマーと、前記化学式(2)、(3)、および(4)で表わされる化合物からなる群より選択された1種以上のモノマーと、のモル比が1:99〜99:1の範囲であることを特徴とする請求項1記載のシロキサン系樹脂。
- 前記酸触媒が、塩酸、硝酸、ベンゼンスルホン酸、シュウ酸、および蟻酸からなる群から選択される少なくとも1種であり、前記塩基触媒が、水酸化カリウム、水酸化ナトリウム、トリエチルアミン、炭酸水素ナトリウムおよびピリジンからなる群から選択される少なくとも1種であることを特徴とする請求項1または2記載のシロキサン系樹脂。
- 前記化学式(1)で表わされる放射状シラン系モノマー、ならびに前記化学式(2)、(3)、および(4)で表わされる化合物からなる群より選択された1種以上のモノマーと、前記酸触媒又は前記塩基触媒と、のモル比が1:0.000001〜1:10の範囲であることを特徴とする請求項1〜3のいずれかに記載のシロキサン系樹脂。
- 前記化学式(1)で表わされる放射状シラン系モノマー、ならびに前記化学式(2)、(3)、および(4)で表わされる化合物からなる群より選択された1種以上のモノマーと、水と、のモル比が1:1〜1:1,000の範囲であることを特徴とする請求項1〜4のいずれかに記載のシロキサン系樹脂。
- 前記加水分解および前記縮合重合が、0〜200℃で、0.1〜100時間行われることを特徴とする請求項1〜5のいずれかに記載のシロキサン系樹脂。
- 前記有機溶媒が、脂肪族炭化水素溶媒、芳香族炭化水素溶媒、ケトン系溶媒、エーテル系溶媒、アセテート系溶媒、アルコール系溶媒、アミド系溶媒、シリコン系溶媒、およびこれらの混合物からなる群から選択される少なくとも1種であることを特徴とする請求項1〜6のいずれかに記載のシロキサン系樹脂。
- 前記シロキサン系樹脂の重量平均分子量が3,000〜300,000の範囲であることを特徴とする請求項1〜7のいずれかに記載のシロキサン系樹脂。
- 請求項1〜8のいずれかに記載のシロキサン系樹脂を有機溶媒に溶かして組成物を形成し、前記組成物をシリコン基板上にコーティングした後、熱硬化させる段階を含むことを特徴とする半導体層間絶縁膜の形成方法。
- 気孔形成物質を前記組成物に対し1〜70質量%の含量となるように添加することを特徴とする請求項9記載の半導体層間絶縁膜の形成方法。
- 前記気孔形成物質が、シクロデキストリン、ポリカプラクトン、又はその誘導体であることを特徴とする請求項9または10記載の半導体層間絶縁膜の形成方法。
- 前記有機溶媒が、脂肪族炭化水素溶媒、芳香族炭化水素溶媒、ケトン系溶媒、エーテル系溶媒、アセテート系溶媒、アルコール系溶媒、アミド系溶媒、シリコン系溶媒およびこれらの混合物からなる群から選択される少なくとも1種を使用することを特徴とする請求項9〜11のいずれかに記載の半導体層間絶縁膜の形成方法。
- 前記シロキサン系樹脂と前記気孔形成物質との合計量が、前記組成物全体に対し5〜70質量%の範囲で使用されることを特徴とする請求項10〜12のいずれかに記載の半導体層間絶縁膜の形成方法。
- 前記シロキサン系樹脂がスピンコーティングによってコーティングされることを特徴とする請求項9〜13のいずれかに記載の半導体層間絶縁膜の形成方法。
- 前記熱硬化が150〜600℃で1〜150分間行われることを特徴とする請求項9〜14のいずれかに記載の半導体層間絶縁膜の形成方法。
- 請求項1〜8のいずれかに記載のシロキサン系樹脂からなる半導体層間絶縁膜。
- 微細気孔を有することを特徴とする請求項16記載の半導体層間絶縁膜。
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Also Published As
Publication number | Publication date |
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KR20050005004A (ko) | 2005-01-13 |
KR100507967B1 (ko) | 2005-08-10 |
DE602004001097D1 (de) | 2006-07-20 |
EP1493773A1 (en) | 2005-01-05 |
CN100393777C (zh) | 2008-06-11 |
DE602004001097T2 (de) | 2007-01-18 |
US7071540B2 (en) | 2006-07-04 |
US20050003681A1 (en) | 2005-01-06 |
US20060264595A1 (en) | 2006-11-23 |
US7294584B2 (en) | 2007-11-13 |
EP1493773B1 (en) | 2006-06-07 |
JP4155947B2 (ja) | 2008-09-24 |
CN1576297A (zh) | 2005-02-09 |
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