塞贝克系数
类型(生物学)
价(化学)
量子隧道
材料科学
热电效应
凝聚态物理
费米能级
热电材料
物理
量子力学
生态学
生物
电子
作者
Yew San Hor,Anthony Richardella,Pedram Roushan,Y. X. Xia,Joseph Checkelsky,Ali Yazdani,M. Zahid Hasan,Nai Phuan Ong,Robert J. Cava
出处
期刊:Physical Review B
[American Physical Society]
日期:2009-05-21
卷期号:79 (19)
被引量:558
标识
DOI:10.1103/physrevb.79.195208
摘要
The growth and elementary properties of p-type Bi2Se3 single crystals are reported. Based on a hypothesis about the defect chemistry of Bi2Se3, the p-type behavior has been induced through low level substitutions (1 percent or less) of Ca for Bi. Scanning tunneling microscopy is employed to image the defects and establish their charge. Tunneling and angle resolved photoemission spectra show that the Fermi level has been lowered into the valence band by about 400 meV in Bi1.98Ca0.02Se3 relative to the n-type material. p-type single crystals with ab plane Seebeck coefficients of +180 microVK-1 at room temperature are reported. These crystals show a giant anomalous peak in the Seebeck coefficient at low temperatures, reaching +120 microVK-1 at 7 K, giving them a high thermoelectric power factor at low temperatures. In addition to its interesting thermoelectric properties, p-type Bi2Se3 is of substantial interest for studies of technologies and phenomena proposed for topological insulators.
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