JP4755831B2 - 低誘電率および超低誘電率のSiCOH誘電体膜ならびにその形成方法 - Google Patents
低誘電率および超低誘電率のSiCOH誘電体膜ならびにその形成方法 Download PDFInfo
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- JP4755831B2 JP4755831B2 JP2005007763A JP2005007763A JP4755831B2 JP 4755831 B2 JP4755831 B2 JP 4755831B2 JP 2005007763 A JP2005007763 A JP 2005007763A JP 2005007763 A JP2005007763 A JP 2005007763A JP 4755831 B2 JP4755831 B2 JP 4755831B2
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 32
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
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Description
好ましい1つのプロセス実施形態では、PECVDツールの中の300℃〜425℃、好ましくは350℃に加熱されたウェハ・チャック上に300mm基板を配置する。本発明では任意のPECVD付着反応装置を使用することができる。次いで、気体および液体前駆物質の流量を安定させて圧力が6トルに達するようにする。ただし1〜10トルの圧力を使用することができる。
k=2.5〜2.6の本発明のSiCOH材料を製造するためには、小さな変更を加えた第1の実施例と同様のプロセスを使用する。具体的には、圧力を6トルよりも高くし、SiCOH OMCTS前駆物質の流量を約1500〜3000mg/分まで下げ、シャワーヘッドのRF電力をわずかに低くする(10〜20%減)。ウェハ・チャックのRF電力を20〜50%引き下げることが重要である。
好ましい1つのプロセス実施形態では、PECVDツールの中の100℃〜400℃、好ましくは200℃〜350℃に加熱されたウェハ・チャック上に300mm基板を配置する。一般に、アプライド・マテリアルズ(Applied Materials)社製のプロデューサ(Producer)(R)、ノーベラス・システムズ(NovellusSystems)社製のベクタ(Vector)(R)などのツールを使用するが、本発明では任意のPECVD付着反応装置を使用することができる。
k=2.2〜2.5の本発明のSiCOH材料を製造するためには、小さな変更を加えた第3の実施例と同様のプロセスを使用する。具体的には、第1のSiCOH前駆物質に対する第2の炭化水素前駆物質の比をより小さくする。
k=2.0〜2.1の本発明のSiCOH材料を製造するためには、第3の実施例と同様のプロセスを使用する。k<2.1である材料の多孔率は30%超であり、より高いポロゲン/SiCOH比を使用する。
32 シリコン基板
34 第1の絶縁材料層
36 第1の金属領域
38 第1のSiCOH誘電膜層
40 第1の導体層
44 第2のSiCOH誘電膜層
50 第2の導体層
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(研磨ストップ層)
74 誘電体キャップ層(研磨ストップ層)
80 電子デバイス
82 誘電体材料層
84 層間絶縁膜層
86 層内誘電体層
92 ビア
94 相互接続
96 拡散バリア層
Claims (15)
- Si、C、O、H元素を含む、誘電率2.8以下、引張応力45MPa未満、弾性率2から15GPa、硬さ0.2から2GPa、凝集強度1.7から4.5J/m2、水中亀裂発達速度が1.1から2.8ミクロンの膜厚に対して1×10−10m/秒以下の誘電体材料であって、前記誘電体材料は、
(1)PECVDツール内のウェハー・チャックを100℃乃至425℃に加熱し、
(2)前記ウェハ・チャック上に基板を配置し、
(3)希ガスとSiCOH前駆物質の混合体の圧力を0.1乃至10トルに維持し、前記前駆物質は、テトラメチルシクロテトラシロキサン(TMCTS)またはオクタメ チルシクロテトラシロキサン(OMCTS)、ジエトキシメチルシラン(DEMS)、ジメチルジメトキシシラン(DMDMOS)、ジエチルメトキシシラン (DEDMOS)、ならびに関連環状および非環状シラン、シロキサンのいずれか1つを含み、
(4)前記前駆物質の流量を50乃至3500mg/分に維持し、
(5)前記PECVDツールのガス導入プレートに、周波数0.26、0.35、0.45若しくは13.6MHz、電力200乃至450Wの高周波エネルギを印加して誘電体材料を前記基板に付着させ、
(6)前記誘電体付着後の処理として、熱エネルギー及び化学作用、電子ビーム、マイクロ波またはプラズマ・エネルギー源の少なくとも1つの第2のエネルギ源からの放射を印加し、形成された、前記誘電体材料。 - 共有結合3次元ネットワーク構造を有する、請求項1に記載の誘電体材料。
- 前記共有結合3次元ネットワーク構造がさらに、付着後の処理を用いて、ネットワークSi−O強度に対するケージSi−O強度の比が低下するFTIR吸光度スペクトルを生み出すSi−O結合を含む、請求項2に記載の誘電体材料。
- 水との接触角が70°超である、請求項1に記載の誘電体材料。
- ナノメートル・サイズの多数の細孔をさらに含む、請求項1に記載の誘電体材料。
- 少なくとも、Si、C、O、H元素を含む、誘電率2.8以下、引張応力45MPa未満、弾性率2から15GPa、硬さ0.2から2GPa、凝集強度1.7から4.5J/m2、水中亀裂発達速度が1.1から2.8ミクロンの膜厚に対して1×10−10m/秒以下の誘電体材料と、配線領域とを含む電子デバイス構造であって、前記誘電体材料は、
(1)PECVDツール内のウェハー・チャックを100℃乃至425℃に加熱し、
(2)前記ウェハ・チャック上に基板を配置し、
(3)希ガスとSiCOH前駆物質の混合体の圧力を0.1乃至10トルに維持し、前記前駆物質は、テトラメチルシクロテトラシロキサン(TMCTS)またはオクタメ チルシクロテトラシロキサン(OMCTS)、ジエトキシメチルシラン(DEMS)、ジメチルジメトキシシラン(DMDMOS)、ジエチルメトキシシラン (DEDMOS)、ならびに関連環状および非環状シラン、シロキサンのいずれか1つを含み、
(4)前記前駆物質の流量を50乃至3500mg/分に維持し、
(5)前記PECVDツールのガス導入プレートに、周波数0.26、0.35、0.45若しくは13.6MHz、電力200乃至450Wの高周波エネルギを印加して誘電体材料を前記基板に付着させ、
(6)前記誘電体付着後の処理として、熱エネルギー及び化学作用、電子ビーム、マイクロ波またはプラズマ・エネルギー源の少なくとも1つの第2のエネルギ源からの放射を印加し、形成された、前記電子デバイス構造。 - 前記誘電体材料が共有結合3次元ネットワーク構造を有する、請求項6に記載の電子デバイス構造。
- 前記共有結合3次元ネットワーク構造がさらに、付着後の処理を用いて、ネットワークSi−O強度に対するケージSi−O強度の比が低下するFTIR吸光度スペクトルを生み出すSi−O結合を含む、請求項7に記載の電子デバイス構造。
- 前記誘電体材料の水との接触角が70°超である、請求項6に記載の電子デバイス構造。
- 前記誘電体材料がさらに、ナノメートル・サイズの多数の細孔を含む、請求項6に記載の電子デバイス構造。
- 第2の前駆物質をさらに含み、前記第2の前駆物質が、環構造を有する分子と、炭化水素環に結合した枝分れ第三級ブチル基またはイソプロピル基を含む分子とからなるグループから選択された炭化水素分子を含む、請求項1に記載の誘電体材料。
- 前記第2の前駆物質が酸素を含む炭化水素分子である、請求項11に記載の誘電体材料。
- 前記第2の前駆物質が酸化シクロペンタン酸化物である、請求項11に記載の誘電体材料。
- 第3の前駆物質をさらに含み、前記第3の前駆物質がゲルマニウム水素化物またはGe源を含む他の反応物である、請求項11に記載の誘電体材料。
- 前記反応装置に酸化剤を供給するステップをさらに含む、請求項11に記載の誘電体材料。
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