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Study of single- and dual-channel designs for high-performance strained-Si-SiGe n-MOSFETs

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8 Author(s)

Results comparing strained-Si-SiGe n-channel MOSFET performance of single-and dual-surface channel devices fabricated using 15% Ge content SiGe virtual substrates are presented. Device fabrication used high thermal budget processes and virtual substrates were not polished. Mobility enhancement factors exceeding 1.6 are demonstrated for both single-and dual-channel device architectures compared with bulk-Si control devices. Single-channel devices exhibit improved gate oxide quality, and larger mobility enhancements, at higher vertical effective fields compared with the dual-channel strain-compensated devices. The compromised performance enhancements of the dual-channel devices are attributed to greater interface roughness and increased Ge diffusion resulting from the Si0.7Ge0.3 buried channel layer.

Published in:

Electron Devices, IEEE Transactions on  (Volume:51 ,  Issue: 8 )

Date of Publication:

Aug. 2004

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