JP5567588B2 - 酸素含有前駆体を用いる誘電体バリアの堆積 - Google Patents
酸素含有前駆体を用いる誘電体バリアの堆積 Download PDFInfo
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Description
銅要素の形成前の、誘電体フィルムを有する集積回路基材を与えるステップ;
次の式のバリア誘電体フィルム前駆体と、該基材とを接触させるステップ:
RxR’y(OR’’)z(OR’’’)aSi
(式中、R、R’’及びR’’’は、メチル、エチル、及びビニルからなる群よりそれぞれ独立して選択され;R’は、水素、メチル、エチル、及びビニルからなる群より選択され;且つx、z及びaは、それぞれ独立して1〜3であり、そしてyは、0〜2であり、x+y+z+a=4である);
プラズマ支援化学気相成長を用いて基材にバリア誘電体フィルムを形成するステップ。
銅要素の形成前の、誘電体フィルムを有する集積回路基材を与えるステップ;
ジエトキシメチルシラン、ジメチルジエトキシシラン及びこれらの混合物からなる群より選択されるバリア誘電体フィルム前駆体、並びに水素、ヘリウム、アンモニア及びこれらの混合物からなる群より選択される化学物質を、該基材と接触させるステップ:
100℃〜400℃の範囲の温度でのプラズマ支援化学気相成長を用いて該基材にバリア誘電体フィルムを形成するステップ;
銅要素を該バリア誘電体フィルム上に形成するステップ。
Pr:反応チャンバー圧力(Pa)
Ps:標準的な雰囲気圧力(Pa)
Tr:反応ガスの平均温度(K)
Ts:標準的な温度(K)
rw:ケイ素基材の半径(m)
D:ケイ素基材と上部電極との間隔(m)
F:反応ガスの合計流量(sccm)
ジメチルジエトキシシランを、表2の推奨条件の下で堆積させた。そして、12分の広域の紫外線(例えば、Fusion H+ bulb)に露光した。この堆積を、ヘリウム、水素、及びアンモニアを用いて、3回行った。図7が示すように、生成フィルムを、続くフィルム処理の間に後にUV照射にさらす時の、ジメチルジエトキシシランを堆積させる場合は、水素又はアンモニアのドーパントガスを用いることで、誘電率(k)の変化を、最小化させることができた。このプロセスから製造された材料、及びこのプロセス条件の使用は、様々な用途で、例えばICの製造で使用するために、フィルム特性をより受け入れやすくすると期待される。
いくつかの製造手順では、比較的高い基材温度及びチャンバー温度での堆積が好ましい。この例では、ジメチルジエトキシシランを、800mg/分の流量で液体前駆体として使用し、ヘリウムを、200sccmの流量でキャリアガスとして使用し、且つ水素を、150sccmの流量で反応ガスとして加えた。堆積チャンバーを、400℃で維持し、誘電体フィルムを、ケイ素基材上に堆積させた。比較的高い操作温度を考えて、水素対前駆体の比を、非常に低く設定した。これは、プラズマに加えられた比較的高い熱エネルギーに起因している。表4に示すように、誘電率4.0で密度1.8g/cc超である目標のフィルムを、堆積条件の変更によって得ることができた。これらのフィルムに、堆積後にUV安定性試験を行い、20分までの露光の長いUV硬化時間でも、誘電率がごくわずかな変化しか示さないことがわかった。
Claims (31)
- 次のステップを含む、基材に拡散バリアフィルムを形成させる方法:
ジエトキシメチルシラン、ジメチルエトキシシラン、ジメチルジエトキシシラン、ジエチルジエトキシシラン、ジメチルジメトキシシラン、メチルジエトキシシラン、メチルエトキシシラン、メチルメトキシシラン、エチルエトキシシラン、エチルメトキシシラン、メチルトリエトキシシラン、エチルトリエトキシシラン、メチルトリメトキシシラン、メチルトリメトキシシラン、エチルトリメトキシシラン、ビニルメチルジエトキシシラン、ビニルメチルエトキシシラン、ビニルメチルジメトキシシラン、ビニルメチルメトキシシラン及びこれらの混合物からなる群より選択される直鎖アルキルアルコキシシラン前駆体、並びに水素、アンモニア及びこれらの混合物からなる群より選択される化学物質を与えるステップ;
前記前駆体及び前記化学物質の化学気相成長反応を用いて基材にフィルムを形成するステップ、ここで前記反応での前記前駆体の流れの滞留時間が、85ミリ秒以下であり、前記フィルムの密度が1.8g/cc超であり、且つ誘電率が6.0未満である。 - 前記化学物質が水素を含む、請求項1に記載の方法。
- 前記前駆体と前記水素の流量比が6:5〜2:7である、請求項2に記載の方法。
- 前記基材の温度が、100℃〜500℃である、請求項1〜3のいずれか一項に記載の方法。
- 前記基材の温度が、150℃〜400℃である、請求項4に記載の方法。
- 前記基材の温度が、250℃〜350℃である、請求項5に記載の方法。
- 前記化学気相成長反応が、プラズマ、パルスプラズマ、ヘリコンプラズマ、高密度プラズマ、誘導結合プラズマ、及びリモートプラズマからなる群より選択される、プラズマ支援化学気相成長である、請求項1〜6のいずれか一項に記載の方法。
- 前記フィルムの形成後に、前記基材をUV照射にさらす、請求項1〜7のいずれか一項に記載の方法。
- 前記形成したフィルムが、1.5超の屈折率を有する、請求項1〜8のいずれか一項に記載の方法。
- 前記滞留時間が、20〜65ミリ秒である、請求項1〜9のいずれか一項に記載の方法。
- 前記誘電率が、3.2〜6.0の範囲である、請求項1〜10のいずれか一項に記載の方法。
- 前記誘電率が、3.2〜4.2の範囲である、請求項11に記載の方法。
- 前記バリア誘電体フィルムが、0.3超の密度対誘電率の比を有する、請求項1〜12のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムが、0.5超の密度対誘電率の比を有する、請求項13に記載の方法。
- 次のステップを含む、集積回路の誘電体フィルムと銅要素との間に拡散バリア誘電体フィルムを形成する方法:
銅要素の形成前の、誘電体フィルムを有する集積回路基材を与えるステップ;
ジエトキシメチルシラン、ジメチルジエトキシシラン及びこれらの混合物からなる群より選択されるバリア誘電体フィルム前駆体、並びに水素、アンモニア及びこれらの混合物からなる群より選択される化学物質を、前記基材と接触させるステップ:
プラズマ支援化学気相成長反応を用いて、前記基材にバリア誘電体フィルムを形成するステップ、ここで前記反応での前記前駆体及び前記化学物質の流れの滞留時間が、85ミリ秒以下である;
前記バリア誘電体フィルムに銅要素を形成するステップ;
ここで、結果として得られるバリア誘電体フィルムは、1.8g/cc超の密度及び6.0未満の誘電率を有する。 - 前記化学物質が水素である、請求項15に記載の方法。
- 前記前駆体と前記水素の流量比が6:5〜2:7である、請求項16に記載の方法。
- 前記バリア誘電体フィルムを堆積させた後に、銅要素を前記バリア誘電体上に堆積させる、請求項15〜17のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムを、続いてUV照射にさらす、請求項15〜18のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムが、酸炭化ケイ素である、請求項15〜19のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムが、3.2超の誘電率を有する、請求項15〜20のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムが、4.2未満の誘電率を有する、請求項15〜21のいずれか一項に記載の方法。
- 前記バリア誘電体フィルムが、3.2〜4.2の範囲で誘電率を有する、請求項15に記載の方法。
- 次のステップを含む、集積回路の誘電体フィルムと銅要素との間に拡散バリア誘電体フィルムを形成する方法:
銅要素を有する誘電体フィルムを有する集積回路基材を与えるステップ;
前記銅要素を酸化から保護することができる界面層を、前記銅要素を有する誘電体フィルムに堆積させるステップ;
ジエトキシメチルシラン、ジメチルジエトキシシラン、及びこれらの混合物からなる群より選択されるバリア誘電体フィルム前駆体、並びに水素、アンモニア、及びこれらの混合物からなる群より選択される化学物質を、基材と接触させるステップ;
前記バリア誘電体前駆体のプラズマ支援化学気相成長反応を用いて、バリア誘電体フィルムを前記基材に形成するステップ、ここで前記反応での前記前駆体の流れの滞留時間は85ミリ秒以下である;
ここで、結果として得られるバリア誘電体フィルムは、1.8g/cc超の密度及び6.0未満の誘電率を有する。 - 前記化学物質が水素である、請求項24に記載の方法。
- 前記前駆体と前記水素の流量比が6:5〜2:7である、請求項25に記載の方法。
- 前記界面層が、CoWPである、請求項24〜26のいずれか一項に記載の方法。
- 前記形成したフィルムが、1.5超の屈折率を有する、請求項24〜27のいずれか一項に記載の方法。
- 前記滞留時間が、20〜65ミリ秒である、請求項24〜28のいずれか一項に記載の方法。
- 前記フィルムが、3.2〜6.0の範囲で誘電率を有する、請求項24〜29のいずれか一項に記載の方法。
- 前記誘電率が、3.2〜4.2の範囲である、請求項30に記載の方法。
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