The Extremely Enhanced Photocurrent Response in Topological Insulator Nanosheets with High Conductance

Autor: Shiu-Ming Huang, Lin-Jie Lin, You-Jhih Yan, Shih-Hsun Yu, Mitch M. C. Chou, Ho-Feng Hsieh, Chin-Jung Ho, Ruei-San Chen
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Nanoscale Research Letters, Vol 13, Iss 1, Pp 1-9 (2018)
Druh dokumentu: article
ISSN: 1931-7573
1556-276X
DOI: 10.1186/s11671-018-2758-0
Popis: Abstract The photocurrent was performed in topological insulator nanosheets with different conductances. The higher photocurrent is observed in the nanosheet with higher conductance. The responsivity is proportional to the nanosheet conductance over two orders. The responsivity is independent of the light power intensity in vacuum, but responsivity drastically decreases at low power intensity in air. The ratio of the responsivity in air to that in vacuum is negatively proportional to the the inverse of the light power intensity. These behaviors are understood as the statistical photocurrent in a system with blocked molecules. The time constant decreases as the thickness increases. A longer time constant is observed in lower atmosphere pressure.
Databáze: Directory of Open Access Journals
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