Simultaneous Enhancement of Electrical Conductivity and Thermopower of Bi2Te3 by Multifunctionality of Native Defects

作者：Suh Joonki; Yu Kin Man; Fu Deyi; Liu Xinyu; Yang Fan; Fan Jin; Smith David J; Zhang Yong Hang; Furdyna Jacek K; Dames Chris; Walukiewicz Wladyslaw; Wu Junqiao^*

来源：Advanced Materials, 2015, 27(24): 3681-3686.

DOI：10.1002/adma.201501350

Simultaneous increases in electrical conductivity (up to 200%) and thermopower (up to 70%) are demonstrated by introducing native defects in Bi2Te3 films, leading to a high power factor of 3.4 x 10(-3) W m(-1) K-2. The maximum enhancement of the power factor occurs when the native defects act beneficially both as electron donors and energy filters to mobile electrons. They also act as effective phonon scatterers.

• 出版日期2015-6-24