JP2011023420A - 半導体装置 - Google Patents
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Abstract
【解決手段】本発明の一態様に係る半導体装置100は、配線層絶縁膜5中に形成されたシングルダマシン構造を有する配線10と、コンタクト層絶縁膜2中に形成され、上層の配線10と下層の導電部材1を電気的に接続するコンタクト3と、コンタクト層絶縁膜2と配線層絶縁膜5との間に形成されたエッチングストッパ膜4と、配線層絶縁膜5上に形成された拡散防止膜6と、を有する。配線10は、芯材14と、芯材14の底面および両側面に接するグラフェン層13と、グラフェン層13の底面および両側面に接する触媒層12と、触媒層12の底面および両側面に接する下地層11とを含む。
【選択図】図1
Description
(半導体装置の構成)
図1は、本発明の第1の実施の形態に係る半導体装置100の断面図である。半導体装置100は、エッチングストッパ膜4および配線層絶縁膜5中に形成されたシングルダマシン構造を有する配線10と、コンタクト層絶縁膜2中に形成され、上層の配線10と下層の導電部材1を電気的に接続するコンタクト3と、配線10および配線層絶縁膜5上に形成された拡散防止膜6と、を有する。
図4A(a)〜(c)、図4B(d)〜(f)は、本発明の第1の実施の形態に係る半導体装置100の製造工程を示す断面図である。
本発明の第1の実施の形態によれば、配線10の伝導層となるグラフェン層13を形成することにより、グラフェンのバリスティック(弾道)伝導性を利用して配線10の電気抵抗を低減することができ、さらに、エレクトロマイグレーションやストレスマイグレーション等のマイグレーションに対する耐性を向上させることが出来る。
第2の実施の形態は、コンタクトがグラフェン層に直接接している点において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略または簡略化する。
図5A、5Bは、本発明の第2の実施の形態に係る半導体装置200の断面図である。また、図6は半導体装置200の上面図である。図6の線分A−Aで切断したときの断面図が図5Aに対応し、線分B−Bで切断したときの断面図が図5Bに対応する。なお、図6においては、配線層絶縁膜5、拡散防止膜6の図示を省略する。
図7(a)〜(c)は、本発明の第2の実施の形態に係る半導体装置200の製造工程を示す断面図である。図7(a)〜(c)に示される断面は、図5Aに示される断面に対応する。
本発明の第2の実施の形態によれば、コンタクト25がグラフェン層13に直接接続されるため、コンタクト25とグラフェン層13の間の電気抵抗を、第1の実施の形態のコンタクト3とグラフェン層13の間の電気抵抗よりも小さくすることができる。
第3の実施の形態は、グラフェン層が芯材の上面上にも形成される点において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略または簡略化する。
図9は、本発明の第3の実施の形態に係る半導体装置300の断面図である。
図10(a)、(b)は、本発明の第3の実施の形態に係る半導体装置300の製造工程を示す断面図である。
本発明の第3の実施の形態によれば、グラフェン層33bを形成することにより、グラフェン層33aの端部にグラフェン層33bが連続する。グラフェン層が端面を持たず、配線30の上面においても途切れなく連続するため、グラフェンの端面での電子散乱がなくなる。これにより、配線抵抗をより低減することができる。
第4の実施の形態は、多層のグラフェン層が形成される点において、第2の実施の形態と異なる。なお、第2の実施の形態と同様の点については、説明を省略または簡略化する。
図11A、11Bは、本発明の第4の実施の形態に係る半導体装置400の断面図である。また、図12は半導体装置400の上面図である。図12の線分C−Cで切断したときの断面図が図11Aに対応し、図12の線分D−Dで切断したときの断面図が図11Bに対応する。なお、図12においては、配線層絶縁膜5、拡散防止膜6の図示を省略する。
図13(a)〜(c)は、本発明の第4の実施の形態に係る半導体装置400の製造工程を示す断面図である。図13(a)〜(c)に示される断面は、図11Aに示される断面に対応する。
本発明の第4の実施の形態によれば、電子伝導に寄与するグラフェン層を複数形成することにより、1つのみ形成する場合と比較して、配線の電気抵抗をより低減させることができる。
第5の実施の形態は、多層のグラフェン層が形成される点において、第3の実施の形態と異なる。なお、第3の実施の形態と同様の点については、説明を省略または簡略化する。
図15は、本発明の第5の実施の形態に係る半導体装置500の断面図である。
図16(a)〜(c)は、本発明の第5の実施の形態に係る半導体装置500の製造工程を示す断面図である。
本発明の第5の実施の形態によれば、グラフェン層53cを形成することにより、グラフェン層53cを形成せずにグラフェン層53a、53bのみを形成する場合と比較して、電子伝導に寄与するグラフェン層の数が増加する。これにより、配線抵抗を低減することができる。
第6の実施の形態は、グラフェン層が平面形状を有する点において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略または簡略化する。
図17は、本発明の第6の実施の形態に係る半導体装置600の断面図である。
図18(a)〜(d)は、本発明の第6の実施の形態に係る半導体装置600の製造工程を示す断面図である。
本発明の第6の実施の形態によれば、配線60の伝導層となるグラフェン層63a、63bを形成することにより、配線60の電気抵抗を低減することができる。
第7の実施の形態は、グラフェン層が配線の側面にも形成される点において、第6の実施の形態と異なる。なお、第6の実施の形態と同様の点については、説明を省略または簡略化する。
図19は、本発明の第7の実施の形態に係る半導体装置700の断面図である。
図20(a)〜(c)は、本発明の第7の実施の形態に係る半導体装置700の製造工程を示す断面図である。
本発明の第7の実施の形態によれば、グラフェン層73cを形成することにより、グラフェン層73cを形成せずにグラフェン層73a、73bのみを形成する場合と比較して、電子伝導に寄与するグラフェン層の数が増加する。これにより、配線抵抗を低減することができる。
第8の実施の形態は、1層の触媒層上にグラフェン層を形成する点において、第6の実施の形態と異なる。なお、第6の実施の形態と同様の点については、説明を省略または簡略化する。
図21は、本発明の第8の実施の形態に係る半導体装置800の断面図である。
図22(a)〜(c)は、本発明の第8の実施の形態に係る半導体装置800の製造工程を示す断面図である。
本発明の第8の実施の形態によれば、触媒層82をある程度の厚さに形成することにより、触媒層82の上面および側面上にグラフェン層83を形成することができる。これにより、配線抵抗を低減することができる。
第9の実施の形態は、配線がデュアルダマシン構造を有する点において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略または簡略化する。
図23は、本発明の第9の実施の形態に係る半導体装置900の断面図である。
図24(a)〜(d)は、本発明の第9の実施の形態に係る半導体装置900の製造工程を示す断面図である。
本発明の第9の実施の形態によれば、配線90の伝導層となるグラフェン層93を形成することにより、配線90の電気抵抗を低減することができる。
本発明は、上記実施の形態に限定されず、発明の主旨を逸脱しない範囲内において種々変形実施が可能である。
Claims (5)
- 基板と、
前記基板上に設けられ、配線溝を有する絶縁膜と、
前記配線溝の側面上および底面上に直接、または他の部材を介在させて設けられた第1の触媒層と、
前記配線溝内に、前記配線溝の側面および底面に沿って、前記第1の触媒層上に前記第1の触媒層に接して設けられた第1のグラフェン層と、
を有する半導体装置。 - 前記配線溝内に前記第1のグラフェン層に接して設けられた芯材をさらに有する、
請求項1に記載の半導体装置。 - 前記芯材は、前記グラフェンの成長の触媒となる触媒材料からなり、
前記第1のグラフェン層は、前記芯材の上面、底面、および両側面に接する、
請求項2に記載の半導体装置。 - 前記配線溝内の前記第1のグラフェン層上に設けられた第2の触媒層と、
前記配線溝内の前記第2の触媒層上に前記第2の触媒層と接して設けられた第2のグラフェン層と、をさらに有する、
請求項1に記載の半導体装置。 - 第1の触媒材料からなる第1の触媒層と、前記第1の触媒材料を触媒として成長するグラフェンからなり、前記第1の触媒層上に形成される第1のグラフェン層と、第2の触媒材料からなり、前記第1のグラフェン層上に形成される第2の触媒層と、前記第2の触媒材料を触媒として成長するグラフェンからなり、前記第2の触媒層上に形成される第2のグラフェン層とを含む配線、
を有する半導体装置。
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