Journal
APPLIED SURFACE SCIENCE
Volume 316, Issue -, Pages 341-347Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2014.07.064
Keywords
Topological insulator; Bismuth selenide; Nanosheets; Responsivity
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Funding
- National Natural Science Foundation of China [51002129, 51172191, 11204261]
- Open Fund based on innovation platform of Hunan Colleges and Universities [13K045]
- Provincial Natural Science Foundation of Hunan [14JJ3079]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13093]
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The photoresponse properties of Bi2Se3 nanosheets prepared by a simple hydrothermal intercalation and exfoliation route are studied. Photoelectrochemical results indicate that the as-prepared Bi2Se3 nanosheets devices have excellent sensitivity, high-speed and good reproducibility as a photodetector, which are superior to the bulk Bi2Se3. Especially, the response time, responsivity, and external quantum efficiency are found to be about 0.7 s, 20.48 mA/W, and 8.36 eta(0), respectively. It is proposed that the two-dimensional nanostructure of Bi2Se3 can be effectively used in high performance nanoscale photodetectors. (C) 2014 Elsevier B. V. All rights reserved.
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