Effective work function modulation of TaN metal gate on Hf O2 after postmetallization annealing

Youhei Sugimoto, Masanari Kajiwara, Keisuke Yamamoto, Yuusaku Suehiro, Dong Wang, Hiroshi Nakashima

研究成果: ジャーナルへの寄稿記事

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The effective work function (m,eff) of TaN on Hf O2 after postmetallization annealing (PMA) was investigated using TaNHf O2 Si O2 Si as a sample structure. We found that m,eff on Hf O2 is stable at PMA temperatures of less than 600 °C and is 4.6 eV, which is approximately 0.2 eV higher than that on Si O2. In contrast, m,eff is modulated by PMA at temperatures greater than 750 °C. An analysis by x-ray photoelectron spectroscopy suggests that the increased m,eff is strongly related to Ta oxide formation near the TaNHf O2 interface. The modulation of m,eff on Hf O2 is discussed on the basis of intrinsic and extrinsic Fermi level pinning due to Ta-O bond formation at the TaNHf O2 interface.

元の言語英語
記事番号112105
ジャーナルApplied Physics Letters
91
発行部数11
DOI
出版物ステータス出版済み - 9 21 2007

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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