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Scalability of strained-Si nMOSFETs down to 25 nm gate length

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16 Author(s)
Jung-Suk Goo ; Technol. Dev. Group, Adv. Micro Devices Inc., Sunnyvale, CA, USA ; Qi Xiang ; Takamura, Yayoi ; Haihong Wang
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Strained-Si nMOSFETs with a standard polysilicon gate process were fabricated down to 25 nm gate length with well-behaved characteristics and small difference in short channel effects. The performance enhancement degrades linearly as the gate length becomes shorter, due to not only the parasitic resistance but also heavy halo implant. Thus the key integration issues are how to manage threshold difference and As diffusion without excess doping. With comparable doping and well controlled parasitic resistance, up to 45% improvement in drive current is predicted for sub-50 nm gate length strained-Si nMOSFETs on the Si/sub 0.8/Ge/sub 0.2/ substrate. In this work approximately 45% enhancement is in fact demonstrated for 35 nm gate length devices, through advanced channel engineering and implementation of metal gates.

Published in:

Electron Device Letters, IEEE  (Volume:24 ,  Issue: 5 )

Date of Publication:

May 2003

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