Direct Probing of Transient Photocurrent Dynamics in p-WSe2 by Time-Resolved Scanning Tunneling Microscopy

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概要

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• We have carried out time-resolved scanning tunneling microscopy on a layered semiconductor with an indirect bandgap, p-WSe2, and the dynamics of nonequilibrium photocurrent generated by ultrashort-pulse-laser excitation was analyzed. The photocurrent dynamics reflecting the flow of excited photocarriers at the surface, which is determined by the balance between the diffusion and tunneling rates, was successfully probed. Furthermore, the excess minority carriers transiently trapped at the surface for a few nanoseconds, which produce a transient surface photovoltage and cannot be detected by conventional methods, were directly observed and evaluated.

• 2013-01-25

著者

• Takeuchi Osamu

  Graduate School Of Dentistry (operative Dentistry) Osaka Dental University

• Shigekawa Hidemi

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Yoshida Shoji

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Yokota Munenori

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Mera Yutaka

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Takeuchi Osamu

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Terada Yasuhiko

  Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• SHIGEKAWA Hidemi

  Graduate School of Pure and Applied Sciences, University of Tsukuba

• MERA Yutaka

  Graduate School of Pure and Applied Sciences, University of Tsukuba

• YOSHIDA Shoji

  Graduate School of Pure and Applied Sciences, University of Tsukuba

• YOKOTA Munenori

  Graduate School of Pure and Applied Sciences, University of Tsukuba

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