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Scaling of strained-Si n-MOSFETs into the ballistic regime and associated anisotropic effects

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2 Author(s)
Bufler, F.M. ; Inst. fur Integrierte Syst., ETH Zurich, Switzerland ; Fichtner, Wolfgang

The dependence of the strain-induced on-current improvement in n-MOSFETs on scaling and the crystallographic orientation of the channel is investigated by self-consistent full-band Monte Carlo simulation. For a channel orientation along the <110> direction, the enhancement decreases weakly from almost 40% to 30% as the effective gate length is reduced from 75 to 25 nm. For the <100> direction, the improvement is about 10% higher. The anisotropy of the drain current, which vanishes for small drain voltages, is attributed to the different band curvatures above 100 meV. This feature appears to be crucial for quasi-ballistic transport of the electrons in the high longitudinal field as they enter the source-side of the channel.

Published in:

Electron Devices, IEEE Transactions on  (Volume:50 ,  Issue: 2 )

Date of Publication:

Feb. 2003

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