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Germanium Nanowire Metal–Oxide–Semiconductor Field-Effect Transistor Fabricated by Complementary-Metal–Oxide–Semiconductor-Compatible Process

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6 Author(s)
Peng, J.W. ; Silicon Nano Device Lab., Nat. Univ. of Singapore, Singapore, Singapore ; Singh, N. ; Lo, G.Q. ; Bosman, M.
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This work presents a complementary metal-oxide-semiconductor-compatible top-down fabrication of Ge nanowires along with their integration into pMOSFETs with "HfO2/TaN" high-k/metal gate stacks. Lateral Ge wires down to 14 nm in diameter are achieved using a two-step dry etch process on a high-quality epitaxial Ge layer. To improve the interface quality between the Ge nanowire and the HfO2, thermally grown GeO2 and epitaxial-Si shells are used as interlayers. Devices with a GeO2 shell demonstrated excellent ION/IOFF ratios (>; 106), whereas the epitaxial-Si shell was found to improve the field-effect mobility of the holes in Ge nanowires to 254 cm2V-1 · s-1.

Published in:

Electron Devices, IEEE Transactions on  (Volume:58 ,  Issue: 1 )

Date of Publication:

Jan. 2011

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