Remarkable enhancement in thermoelectric performance of BiCuSeO by Cu deficiencies

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

Research output: Contribution to journalArticlepeer-review

268 Citations (Scopus)


A significant enhancement of thermoelectric performance in layered oxyselenides BiCuSeO was achieved. The electrical conductivity and Seebeck coefficient of BiCu1-xSeO (x = 0-0.1) indicate that the carriers were introduced in the (Cu2Se2)2- layer by Cu deficiencies. The maximum of electrical conductivity is 3 × 103 S m-1 for Bicu0.975Seo 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 BiCu0.975SeO by introducing Cu deficiencies, which makes it a promising candidate for medium temperature thermoelectric applications.

Original languageEnglish
Pages (from-to)20112-20115
Number of pages4
JournalJournal of the American Chemical Society
Issue number50
Publication statusPublished - 2011 Dec 21


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