期刊
APPLIED PHYSICS LETTERS
卷 105, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4903780
关键词
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资金
- DST-SERB [SB/FTP/PS-065/2013, SB/FT/CS-116/2013, SR/S2/RJN-21/2012, SR/S2/RJN-130/2012]
- UGC-UKIERI [UGC-2013-14/005]
- NCL-MLP project [028626]
- INUP IITB project - DeitY, MCIT, Government of India
We report high performance IR photocurrent response of two-dimensional hybrid materials consisting of layered WS2 nanosheets and reduced graphene oxide (RGO). Comparative photocurrent response studies of WS2 nanosheets, RGO, and WS2/RGO hybrids were carried out by performing current-voltage (I-V) and time-dependent current measurements with a laser excitation source having a wavelength of 808 nm. The experimental investigations indicate that WS2/RGO hybrids show negative photocurrent response, whereas WS2 and RGO show positive photocurrent response. The negative photocurrent response of the WS2/RGO hybrids is explained using a band alignment diagram and attributed to a charge transfer mechanism between WS2 and RGO. This analysis is further corroborated by first-principles density functional calculations. The fabricated device based on WS2/RGO hybrids shows a photosensitivity R-lambda of about 6 AW(-1) and a quantum efficiency eta of similar to 924%, which demonstrates high sensitivity of the hybrid material towards IR detection. WS2/RGO hybrids are therefore promising candidates for potential applications in optoelectronic circuits and low cost, high performance, and reliable photodetectors. (C) 2014 AIP Publishing LLC.
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