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Influence of the Nano-mesh Metal Electrode to Light Excitation of Carriers in Semiconductor

Published online by Cambridge University Press:  12 July 2012

Kumi Masunaga ,
Kenji Nakamura ,
Ryota Kitagawa ,
Eishi Tsutsumi ,
Tsutomu Nakanishi ,
Akira Fujimoto ,
Hideyuki Nishizawa  and
Koji Asakawa
Kumi Masunaga
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Kenji Nakamura
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Ryota Kitagawa
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Eishi Tsutsumi
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Tsutomu Nakanishi
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Akira Fujimoto
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Hideyuki Nishizawa
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
Koji Asakawa
Affiliation:
Corporate Research and Development Center, Toshiba Corporation, 1, Komukai-Toshiba-cho, Saiwai-ku, Kawasaki, 212-8582, Japan
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Abstract

A thin metal film with nano-apertures, called “nano-mesh electrode,” generates near-field lights near the electrode. We investigated carrier excitations in semiconductors by the near-field light. Finite-difference time-domain (FDTD) method revealed that when the infrared light irradiates the Au nano-mesh electrode on Ge, near-field lights are generated and absorbed in the surface region of the Ge. In order to measure the photocurrent involved by near-filed lights, we fabricated a Schottky cell and applied a Au nano-mesh electrode on the n-type Ge. The efficiency of the Schottky cell with the Au nano-mesh electrode improved in infrared region compared to plain the Au-film Schottky cell. The agreement between theoretical simulations and experiments indicates that near-field lights enhance the carrier excitation in the semiconductor.

Keywords

nanostructureself-assemblyphotovoltaic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1391: Symposium J – Photonic and Plasmonic Materials for Enhanced Photovoltaic Performance , 2012 , mrsf11-1391-j05-02
Copyright
Copyright © Materials Research Society 2012

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References

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