JP5065054B2 - 制御された二軸応力を有する超低誘電率膜および該作製方法 - Google Patents
制御された二軸応力を有する超低誘電率膜および該作製方法 Download PDFInfo
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- JP5065054B2 JP5065054B2 JP2007557020A JP2007557020A JP5065054B2 JP 5065054 B2 JP5065054 B2 JP 5065054B2 JP 2007557020 A JP2007557020 A JP 2007557020A JP 2007557020 A JP2007557020 A JP 2007557020A JP 5065054 B2 JP5065054 B2 JP 5065054B2
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
- H01L21/76825—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc. by exposing the layer to particle radiation, e.g. ion implantation, irradiation with UV light or electrons etc.
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen
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Description
1.フォーミング・ガス・アニール、400℃、14時間。
2.10ppmのO2を有するN2ガス・アニール、400℃、14時間。
3.300ppmのO2を有するN2ガス・アニール、400℃、14時間。
・1700〜1800cm−1の領域の1つまたは2つ以上のピークはさまざまな隣接原子を有するC=Oによる。
・1607cm−1のピークはC=Cによる。
・1460cm−1のピークはSiから離れたCH2による。
・1411cm−1のピークはSiMexのCH3による。
・1378cm−1のピークはSiCH2SiのCH2による。
・2241および2172cm−1のピークはそれぞれHSiO3およびHSiO2Siによる。
・条件1〜3でアニールすると、
o膜の中のCHx含量は減少し、細孔源(porogen)の減少を示す。
oSiOSi結合全含量は増加し、架橋が増加したことを示す。
oSiCH3変角振動(bend)の強度は増加し、多孔度(多孔率)が増加し、その結果、振動の遮蔽が減少したことを意味する。
・条件1、フォーミング・ガス中、400℃、14時間、または条件2、10ppmのO2を有するN2ガス中、400℃、14時間、でアニールすると
oネットワーク・ピーク強度はほとんど同じであった。これは、SiOSi結合含量が保持されることを意味する。
o亜酸化物(suboxide)ピーク強度は増加した。これは、Si‐Si架橋形成によって説明される。
oSiHピーク強度は減少した。これは、この部分がSi‐Si架橋反応に関与することを意味する。
oC=Oピーク強度は減少した。これは、細孔源の損失が起こり、C=O結合が減少したことを意味する。
oCH2(無Si)ピーク強度は減少した。これは、細孔源の損失が起こったことを意味する。
oSiCH2Siは消失した。これは、Si‐Si架橋形成によって失われることを意味する。
・条件3、300ppmのO2を有するN2ガス中、400℃、14時間、でアニールすると、
oSiOSiネットワーク・ピーク強度は増加した。これは、より多くのSiOSi結合が形成されたことを意味する。
oSiOSi亜酸化物ピーク強度は減少した。これは、これらのアニールによってより多くのSiOSi結合が形成され、O以外のXを有するSiX結合が除去されたことを意味する。
o全SiHピーク強度は減少し、一方、HSiO2Siによるピークは完全に消失した。これは、新しいSiOSi架橋結合の生成に結びつけることができる。
oC=Oピーク強度は増加した。これは、SiCOH中の有機成分の酸化が起こったことを意味する。
oCH2(無Si)ピーク強度は増加した。これは、細孔源が膜の中に捕捉されたことを意味する
oSiCH2Siピーク強度は保持された。
・条件3、300ppmのO2を有するN2ガス中、400℃、14時間、または条件2、10ppmのO2を有するN2ガス中、400℃、14時間、でアニールすると、おそらく炭酸塩形成によって、C=Cピーク強度は増加する。これとは反対に、条件1、純フォーミング・ガス中、400℃、14時間、でアニールした膜の中では、C=Cピークは同じままであるか、または減少する。
32 シリコン基板またはシリコン含有基板
34 第1の絶縁材料層
36 第1の金属領域
38 第1の超低k膜
40 第1の導体層
44 第2の超低k膜
50 第2の導体領域
60 電子デバイス
62 誘電体キャップ層
70 電子デバイス
72 誘電体キャップ層
74 誘電体キャップ層
80 電子デバイス
82 誘電体層(エッチング停止層)
84 絶縁材料層
86 絶縁材料層
92 相互接続部
94 相互接続部
96 拡散障壁層
Claims (14)
- Si、C、OおよびHの原子を含む超低誘電率膜であって、共有結合による三次元ネットワーク構造体と、2.8以下の誘電率と、直径が0.5乃至30ナノメートル分子スケールの空洞を有する制御された多孔体であって、前記分子スケールの空洞は5%乃至40%の体積を占める前記多孔体と、を有し、46MPa未満の二軸応力を示す超低誘電率膜。
- 前記膜の前記二軸応力は、40MPa以下である、請求項1に記載の膜。
- 前記膜の前記二軸応力は、堆積後の未硬化の膜の応力プラス5MPa以下である、請求項1に記載の膜。
- 前記膜は、2.8以下の誘電率を有する、請求項1に記載の膜。
- 前記膜は、1.5から2.8の範囲の誘電率を有する、請求項1に記載の膜。
- 前記膜は、5から40原子パーセントのSiと、5から45原子パーセントのCと、0から50原子パーセントのOと、10から55原子パーセントのHと、を含む請求項1に記載の膜。
- Si、C、OおよびHの原子を含む誘電体材料を少なくとも含む電子構造体であって、前記誘電体材料は、共有結合による三次元ネットワーク構造体と、2.8以下の誘電率と、直径が0.5乃至30ナノメートル分子スケールの空洞を有する制御された多孔体であって、前記分子スケールの空洞は5%乃至40%の体積を占める前記多孔体と、46MPaおよび前記堆積後の未硬化の材料の応力プラス5MPaのどちらよりも高くない制御された二軸応力と、を有する電子構造体。
- 前記誘電体材料は、後工程相互接続配線レベル間、BEOL相互接続配線レベル内、キャップ層、ハード・マスク、CMP停止層およびエッチング停止層の一つにおいて用いられる、請求項7に記載の電子構造体。
- Si、C、OおよびHの元素を含み、低く、制御可能な二軸応力を示す超低誘電率膜を作製するための方法であって、
プラズマ促進化学的気相堆積法とスピン・コーティングとからなる群から選ばれたプロセスによって基板の上に前記膜を堆積する工程と、
前記堆積後の膜と、前記堆積後の膜を上に形成した基板とを、前記堆積後の膜を周囲雰囲気に暴露する前に、0から10ppmの範囲の制御された非常に低い酸素濃度を含む非酸化性環境中で放冷する工程と、
それぞれ0から10ppmの範囲の制御された非常に低い濃度の酸素と水とを含む環境中で前記堆積後の膜を硬化する工程と、
を含む方法。 - 前記硬化する工程は、それぞれ0から10ppmの範囲の制御された非常に低い濃度の酸素または水を含む環境中で、熱、電子線、プラズマ、UV、DUVまたはレーザを含む群から選ばれた一つ以上のエネルギー源に前記膜をもう一度曝露することをさらに含む、請求項9に記載の方法。
- 前記膜を、UV処理または電子線処理してから、同じ環境中で室温まで放冷する、請求項9に記載の方法。
- Si、C、OおよびHの元素を含み、低く、制御可能な二軸応力を示す超低誘電率膜を作製するための一体型プラズマ促進化学的気相堆積法の硬化ツールであって、
プラズマ促進化学的気相堆積法を用いて基板上に前記膜を堆積するプロセス工程と、
0から100ppmの範囲の制御された非常に低い酸素濃度を含む非酸化性環境中のツール中のプロセス領域の間で前記基板を移動するプロセス工程と、
それぞれ0から100ppmの範囲の制御された非常に低い濃度の酸素または水を含む環境中で前記堆積後の膜を硬化するプロセス工程と、
前記基板を周囲雰囲気に暴露する前に、それぞれ0から10ppmの範囲の制御された非常に低い濃度の酸素または水を含む非酸化性環境中で前記基板を放冷するプロセス工程と、
を実行するツール。 - 前記環境は、二重結合基を有し、硬化後の反応部位を不動態化し、SiCOHおよび多孔質SiCOH膜酸化を減らすために10ppm未満の酸素レベルを有する非酸化性炭化水素雰囲気である、請求項12に記載のツール。
- 前記非酸化性炭化水素雰囲気の二重結合基は、エチレンまたは1,3‐ブタジエンを含む、請求項13に記載のツール。
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2005
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2006
- 2006-01-09 TW TW095100786A patent/TW200636859A/zh unknown
- 2006-01-12 JP JP2007557020A patent/JP5065054B2/ja not_active Expired - Fee Related
- 2006-01-12 CN CN2006800022767A patent/CN101548362B/zh not_active Expired - Fee Related
- 2006-01-12 EP EP06849665A patent/EP1854131A4/en not_active Withdrawn
- 2006-01-12 WO PCT/US2006/001154 patent/WO2007089223A2/en active Application Filing
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2008
- 2008-03-07 US US12/044,334 patent/US20080286494A1/en not_active Abandoned
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Also Published As
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CN101548362B (zh) | 2012-10-03 |
TW200636859A (en) | 2006-10-16 |
WO2007089223A2 (en) | 2007-08-09 |
US20090304951A1 (en) | 2009-12-10 |
EP1854131A4 (en) | 2011-03-30 |
WO2007089223A3 (en) | 2007-11-01 |
US20080286494A1 (en) | 2008-11-20 |
JP2008527757A (ja) | 2008-07-24 |
US20080044668A1 (en) | 2008-02-21 |
CN101548362A (zh) | 2009-09-30 |
EP1854131A2 (en) | 2007-11-14 |
US7357977B2 (en) | 2008-04-15 |
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