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Yasuhiro Hayakawa
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Phonon-drag Contribution to Seebeck Coefficient of Ge-on-insulator Substrate Fabricated by Wafer Bonding Process Manimuthu, Veerappan; Yoshida, Shoma; Suzuki, Yuhei; Salleh, Faiz; Arivanandhan, Mukannan; Kamakura, Yoshinari; Hayakawa, Yasuhiro; Ikeda, Hiroya
Makara Journal of Technology Vol. 19, No. 1
Publisher : UI Scholars Hub

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Abstract

In order to build high-sensitivity infrared photodetectors using SiGe nanowires, we investigate the thermoelectric characteristics of Ge-on-insulator (GOI) layers as a reference for SiGe. We fabricate p-type GOI substrates with an impurity concentration of 1016-1018cm-3 by a wafer-bonding process using Ge and oxidized Si wafers. Annealing treatment is performed in order to further increase the bonding strength of Ge/SiO2 interface. We measure the Seebeck coefficient in the temperature range of 290-350 K. The Seebeck coefficient of the GOI layers is very close to the theoretical value for Ge, calculated on the basis of carrier transport. Hence, there is a small phonon-drag effect in GOI. On the other hand, the effect of phonon drag on the Seebeck coefficient of Si is usually significant. These results likely stem from the differences between phonon velocity, phonon mean-free-path, and hole mobility between Ge and Si.
Co-Authors Faiz Salleh Hiroya Ikeda Mukannan Arivanandhan Shoma Yoshida Veerappan Manimuthu Yoshinari Kamakura Yuhei Suzuki