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\hbox {Ge-Si}_{x}\hbox {Ge}_{1 - x} Core–Shell Nanowire Tunneling Field-Effect Transistors

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4 Author(s)
Nah, Junghyo ; Microelectron. Res. Center, Univ. of Texas at Austin, Austin, TX, USA ; En-Shao Liu ; Varahramyan, K.M. ; Tutuc, E.

We report the fabrication and experimental investigation of Ge-SixGe1-xcore-shell nanowire (NW) tunneling field-effect transistors (TFETs), consisting of p-i-n device structures realized by low-energy ion implantation. We investigate the NW TFET device characteristics as a function of drain doping, channel length, and temperature. Our devices show on-state currents of up to ION ~ 5μA/μm, with an ambipolar behavior that can be suppressed by varying the drain doping concentration. The subthreshold swing of NW TFETs shows little temperature dependence down to 77 K, consistent with band-to-band tunneling as being the dominant carrier injection mechanism.

Published in:

Electron Devices, IEEE Transactions on  (Volume:57 ,  Issue: 8 )

Date of Publication:

Aug. 2010

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