Dopant profiling in vertical ultrathin channels of double-gate metal–oxide–semiconductor field-effect transistors by using scanning nonlinear dielectric microscopy
2004; American Institute of Physics; Volume: 85; Issue: 18 Linguagem: Inglês
10.1063/1.1812571
ISSN1520-8842
AutoresMeishoku Masahara, Shinichi Hosokawa, Takashi Matsukawa, Kazuhiko Endo, Yuuichi Naitou, H. Tanoue, Eiichi Suzuki,
Tópico(s)Nanowire Synthesis and Applications
ResumoNanometer-scale dopant profiling in the vertical ultrathin channels (UTCs) of double-gate metal–oxide–semiconductor field-effect transistors has been performed by using scanning nonlinear dielectric microscopy. UTCs 18–58nm thick and 175nm high were formed on a bulk silicon substrate by orientation-dependent wet etching. An n+∕p junction was fabricated on the top of the UTC by angled ion implantation. By beveling the UTC with an ultragentle angle, the vertical size of the UTC was amplified by a factor of 86. Using the beveled samples, the channel thickness dependence of the dopant depth profile in the UTC was quantitatively investigated. It was found that a significant dopant loss occurs when the channel thickness is reduced to 18nm.
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