JP6100589B2 - 自己整合型ソース・ドレインコンタクトを有する半導体装置およびその製造方法 - Google Patents
自己整合型ソース・ドレインコンタクトを有する半導体装置およびその製造方法 Download PDFInfo
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Description
Claims (21)
- 半導体基板と、
前記半導体基板上に形成され、前記半導体基板上のゲート誘電体膜と、前記ゲート誘電体膜上のゲート電極と、を備えるトランジスタと、
誘電体材料で形成され、前記トランジスタのソース側で前記ゲート電極に沿って延伸する第1部分と、前記トランジスタのドレイン側で前記ゲート電極に沿って延伸する第2部分と、を含むゲートサイドウォールと、
前記ゲートサイドウォールの前記第1部分と前記第2部分の間にあって前記ゲート電極上にある保護誘電体層と、
前記トランジスタのソース領域またはドレイン領域まで延伸し、前記ゲート電極と部分的に重複するコンタクトホールを充填するコンタクトと、を備え、
前記ゲートサイドウォールの前記第1部分は、前記ゲートサイドウォールの前記第2部分に対向する第1内面を有し、
前記ゲートサイドウォールの前記第2部分は、前記ゲートサイドウォールの前記第1部分に対向する第2内面を有し、
前記ゲート電極は、バリア導電層と、金属置換層と、を有し、
前記バリア導電層は、前記ゲート誘電体膜上で前記ゲート誘電体膜に沿う第1領域と、前記第1領域から前記保護誘電体層にかけて前記ゲートサイドウォールの前記第1内面に沿う第2領域と、前記第1領域から前記保護誘電体層にかけて前記ゲートサイドウォールの前記第2内面に沿う第3領域と、を含み、
前記金属置換層は、前記バリア導電層の前記第1領域と前記保護誘電体層の間かつ前記バリア導電層の前記第2領域と前記第3領域の間に位置し、
前記金属置換層は、0.1〜10原子%の範囲のシリコン濃度を有する半導体装置。 - 請求項1に記載の半導体装置であって、
前記保護誘電体層が窒化シリコンを含む半導体装置。 - 請求項2に記載の半導体装置であって、
前記保護誘電体層が、前記トランジスタのチャネル領域に応力を与える半導体装置。 - 請求項1に記載の半導体装置であって、
前記バリア導電層が窒素を含む半導体装置。 - 請求項1に記載の半導体装置であって、
前記トランジスタがNチャネルトランジスタであり、
Pチャネルトランジスタである別の前記トランジスタをさらに備え、前記Pチャネルトランジスタも前記半導体基板上に形成され、前記Nチャネルトランジスタの前記バリア導電層の厚さが、前記Pチャネルトランジスタの前記バリア導電層の厚さと異なる半導体装置。 - 請求項1に記載の半導体装置であって、
前記金属置換層が、Al、Cu、Ag、PtおよびWの少なくとも1つを含む半導体装置。 - 請求項1に記載の半導体装置であって、
前記トランジスタが、20nm以下のゲート長を有する半導体装置。 - 請求項7に記載の半導体装置であって、
前記トランジスタが、10〜20nmのゲート長を有する半導体装置。 - 請求項1に記載の半導体装置であって、
前記トランジスタが、60nm以下のゲート高さを有する半導体装置。 - 請求項9に記載の半導体装置であって、
前記トランジスタが、40〜60nmのゲート高さを有する半導体装置。 - 半導体基板上にあるダミーゲート電極上、ならびに前記ダミーゲート電極に隣接するサイドウォールおよび前記サイドウォールに隣接するソースおよびドレイン領域上に誘電体層を形成する工程と、
前記ダミーゲート電極の上面を露出する工程と、
前記ダミーゲート電極を除去することで、前記サイドウォール間にトレンチを形成する工程と、
前記トレンチに、ゲート誘電体層、バリア導電層およびシリコン層を形成する工程と、
前記シリコン層の上面の位置が前記サイドウォールの頂部の表面の位置よりも低くなるように前記シリコン層をエッチングする工程と、
前記シリコン層上および前記サイドウォール間に、シリコンとの置換反応が可能な金属を堆積する工程と、
前記シリコン層を前記金属で置換するように前記金属をアニールし、前記置換によって前記金属上にわたって形成されたシリコン層を除去する工程と、
コンタクトホールの形成中に前記金属を保護する保護誘電体層を、前記金属上にわたって前記サイドウォール間に形成する工程と、
を含む半導体装置の製造方法。 - 請求項11に記載の方法であって、
前記保護誘電体層が窒化シリコンを含む方法。 - 請求項11に記載の方法であって、
前記バリア導電層が窒素含有膜である方法。 - 請求項11に記載の方法であって、
NチャネルトランジスタおよびPチャネルトランジスタが、同じ半導体基板に形成され、前記Nチャネルトランジスタの前記バリア導電層の厚さが、前記Pチャネルトランジスタの前記バリア導電層の厚さと異なる方法。 - 請求項11に記載の方法であって、
前記アニールが、400℃〜500℃の温度で行われる方法。 - 請求項11に記載の方法であって、
前記金属が、0.1〜10原子%のシリコン含有量を有する方法。 - 請求項11に記載の方法であって、
前記金属が、Al、Cu、Ag、PtおよびWの少なくとも1つである方法。 - 請求項11に記載の方法であって、
前記サイドウォールが、20nm以下の長さだけ互いに間隔を空けて設けられる方法。 - 請求項18に記載の方法であって、
前記サイドウォールが、10〜20nmの長さだけ互いに間隔を空けて設けられる方法。 - 請求項18に記載の方法であって、
前記トレンチが、60nm以下の深さを有する方法。 - 請求項20に記載の方法であって、
前記トレンチが、40〜60nm以下の深さを有する方法。
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US8093117B2 (en) * | 2010-01-14 | 2012-01-10 | Taiwan Semiconductor Manufacturing Company, Ltd. | Method of forming a metal gate |
US8373239B2 (en) * | 2010-06-08 | 2013-02-12 | International Business Machines Corporation | Structure and method for replacement gate MOSFET with self-aligned contact using sacrificial mandrel dielectric |
JP5569243B2 (ja) * | 2010-08-09 | 2014-08-13 | ソニー株式会社 | 半導体装置及びその製造方法 |
US8536040B1 (en) * | 2012-04-03 | 2013-09-17 | Globalfoundries Inc. | Techniques for using material substitution processes to form replacement metal gate electrodes of semiconductor devices with self-aligned contacts |
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