Галерея 3131842
Галерея 3131842
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Journal of Applied Physics
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Volume 105, Issue 11
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10.1063/1.3131842
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Submitted: 15 February 2009
Accepted: 14 April 2009
Published Online: 04 June 2009
Mean free path limitation of thermoelectric properties of bismuth nanowire
Journal of Applied Physics 105 , 113706 (2009);
https://doi.org/10.1063/1.3131842
Masayuki Murata Daiki Nakamura Yasuhiro Hasegawa Takashi Komine Takashi Taguchi Shinichiro Nakamura Christopher M. Jaworski Vladimir Jovovic Joseph P. Heremans
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Temperature coefficient
A limiting mean free path was considered in order to better understand the temperature and wire diameter dependence of the resistivity and Seebeck coefficient of bismuth microwire and nanowire samples. The mean free path limited mobility was numerically calculated from experimentally measured mobility in a bulk bismuth sample, and the electron and hole mobilities were dramatically decreased to a 10 μ m mean free path. Therefore, the temperature dependence of resistivity in very thin wire was quite different from that of a bulk sample, which had a positive temperature coefficient. The calculations showed that the temperature coefficient decreased gradually with decreasing mean free path, and the coefficient became negative for a mean free path of less than 1 μ m at about 150 K. The Seebeck coefficient was also calculated, but showed only a weak dependence on mean free path compared with the resistivity. Experimental comparisons were made to previous measurements of bismuth microwire or nanowire samples, and the temperature and wire diameter dependencies of the resistivity and Seebeck coefficient were qualitatively and quantitatively in very good agreement. Therefore, the temperature dependencies of nanowire samples over 850 nm in diameter were well described using the mean free path limitation.
This research was supported in part by a Grant-in-Aid for the Encouragement of Young Scientists from the Japan Society for the Promotion of Science, the Science and Technology Foundation of Japan, and the Thermal & Electric Energy Technology Foundation. This work was performed under the auspices of the National Institute for Fusion Science (NIFS) Collaborative Research (Grant No. NIFS08KYBI007) and NINS Creating Innovative Research Fields Project (Grant No. NIFS08KEIN0091).
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