Remarkable Enhancement in Thermoelectric Performance of BiCuSeO by Cu Deficiencies

详细信息    查看全文

• 作者：Yong Liu ; Li-Dong Zhao ; Yaochun Liu ; Jinle Lan ; Wei Xu ; Fu Li ; Bo-Ping Zhang ; David Berardan ; Nita Dragoe ; Yuan-Hua Lin ; Ce-Wen Nan ; Jing-Feng Li ; Hongmin Zhu
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：December 21, 2011
• 年：2011
• 卷：133
• 期：50
• 页码：20112-20115
• 全文大小：807K
• 年卷期：v.133,no.50(December 21, 2011)
• ISSN：1520-5126

文摘

A significant enhancement of thermoelectric performance in layered oxyselenides BiCuSeO was achieved. The electrical conductivity and Seebeck coefficient of BiCu_1鈥?i>xSeO (x = 0鈥?.1) indicate that the carriers were introduced in the (Cu₂Se₂)^{2鈥?/sup> layer by Cu deficiencies. The maximum of electrical conductivity is 3 脳 103 S m鈥? for Bicu_0.975Seo at 650 掳C, much larger than 470 S m鈥? for pristine BiCuSeO. Featured with very low thermal conductivity (0.5 W m鈥? K鈥?) and a large Seebeck coefficient (+273 渭V K鈥?), ZT at 650 掳C is significantly increased from 0.50 for pristine BiCuSeO to 0.81 for BiCu_0.975SeO by introducing Cu deficiencies, which makes it a promising candidate for medium temperature thermoelectric applications.}