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Fermi level tuning of Ag-doped Bi

Authors :
Eri, Uesugi
Takaki, Uchiyama
Hidenori, Goto
Hiromi, Ota
Teppei, Ueno
Hirokazu, Fujiwara
Kensei, Terashima
Takayoshi, Yokoya
Fumihiko, Matsui
Jun, Akimitsu
Kaya, Kobayashi
Yoshihiro, Kubozono
Source :
Scientific Reports
Publication Year :
2018

Abstract

The temperature dependence of the resistivity (ρ) of Ag-doped Bi2Se3 (AgxBi2−xSe3) shows insulating behavior above 35 K, but below 35 K, ρ suddenly decreases with decreasing temperature, in contrast to the metallic behavior for non-doped Bi2Se3 at 1.5–300 K. This significant change in transport properties from metallic behavior clearly shows that the Ag doping of Bi2Se3 can effectively tune the Fermi level downward. The Hall effect measurement shows that carrier is still electron in AgxBi2−xSe3 and the electron density changes with temperature to reasonably explain the transport properties. Furthermore, the positive gating of AgxBi2−xSe3 provides metallic behavior that is similar to that of non-doped Bi2Se3, indicating a successful upward tuning of the Fermi level.

Subjects

Subjects :
Article

Details

ISSN :
20452322
Volume :
9
Issue :
1
Database :
OpenAIRE
Journal :
Scientific reports
Accession number :
edsair.pmid..........60ef71c9474937958f2a279fe9060019