EOT of 0.62 nm and high electron mobility in La-silicate/Si structure based nMOSFETs achieved by utilizing metal-inserted poly-si stacks and annealing at high temperature

Takamasa Kawanago, Yeonghun Lee, Kuniyuki Kakushima, Parhat Ahmet, Kazuo Tsutsui, Akira Nishiyama, Nobuyuki Sugii, Kenji Natori, Takeo Hattori, Hiroshi Iwai

研究成果: Article査読

39 被引用数 (Scopus)

抄録

This paper reports on the control of the direct-contact La-silicate/Si interface structure with the aim of achieving scaled equivalent oxide thickness (EOT) and small interface state density. The interface state density at the direct-contact La-silicate/Si interface is found to be reduced to 1.6 \times \hbox{10}^{11}\ \hbox{cm}^{-2}\hbox{eV} -1 by annealing at 800 ^̂{C} for 30 min in forming gas ambient, whereas excess silicate reaction concurrently induced a significant increase in EOT. By utilizing metal-inserted poly-Si (MIPS) stacks and their annealing at high temperature, the increase in EOT is drastically suppressed. At the same time, a superior interfacial property is obtained because the Si layer in the MIPS stacks prevents the excess oxygen diffusion from the atmosphere during the annealing process. As a result, the effective electron mobility of 155 cm^{2}/\hbox{V}\cdot{s} at 1 MV/cm and an EOT of 0.62 nm are successfully achieved by utilizing direct-contact La-silicate/Si structure. This result is comparable with the recorded effective electron mobility achieved by utilizing Hf-based oxides/Si structure. This demonstrates the advantage of our proposed method to realize the scaled EOT with a superior interfacial property for state-of-the-art metal-oxide-semiconductor field-effect transistors.

本文言語English
論文番号6093743
ページ(範囲)269-276
ページ数8
ジャーナルIEEE Transactions on Electron Devices
59
2
DOI
出版ステータスPublished - 2012 2月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

フィンガープリント

「EOT of 0.62 nm and high electron mobility in La-silicate/Si structure based nMOSFETs achieved by utilizing metal-inserted poly-si stacks and annealing at high temperature」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル