Remarkable enhancement in thermoelectric performance of BiCuSeO by Cu deficiencies |
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Authors: | Liu Yong Zhao Li-Dong Liu Yaochun Lan Jinle Xu Wei Li Fu Zhang Bo-Ping Berardan David Dragoe Nita Lin Yuan-Hua Nan Ce-Wen Li Jing-Feng Zhu Hongmin |
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Institution: | State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. |
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Abstract: | A significant enhancement of thermoelectric performance in layered oxyselenides BiCuSeO was achieved. The electrical conductivity and Seebeck coefficient of BiCu(1-x)SeO (x = 0-0.1) indicate that the carriers were introduced in the (Cu(2)Se(2))(2-) layer by Cu deficiencies. The maximum of electrical conductivity is 3 × 10(3) S m(-1) for Bicu(0.975)Seo at 650 °C, much larger than 470 S m(-1) for pristine BiCuSeO. Featured with very low thermal conductivity (~0.5 W m(-1) K(-1)) and a large Seebeck coefficient (+273 μV K(-1)), ZT at 650 °C is significantly increased from 0.50 for pristine BiCuSeO to 0.81 for BiCu(0.975)SeO by introducing Cu deficiencies, which makes it a promising candidate for medium temperature thermoelectric applications. |
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