Negative infrared photocurrent response in layered WS{sub 2}/reduced graphene oxide hybrids
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
- School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 751013 (India)
We report high performance IR photocurrent response of two-dimensional hybrid materials consisting of layered WS{sub 2} nanosheets and reduced graphene oxide (RGO). Comparative photocurrent response studies of WS{sub 2} nanosheets, RGO, and WS{sub 2}/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 WS{sub 2}/RGO hybrids show negative photocurrent response, whereas WS{sub 2} and RGO show positive photocurrent response. The negative photocurrent response of the WS{sub 2}/RGO hybrids is explained using a band alignment diagram and attributed to a charge transfer mechanism between WS{sub 2} and RGO. This analysis is further corroborated by first-principles density functional calculations. The fabricated device based on WS{sub 2}/RGO hybrids shows a photosensitivity R{sub λ} of about 6 AW{sup −1} and a quantum efficiency η of ∼924%, which demonstrates high sensitivity of the hybrid material towards IR detection. WS{sub 2}/RGO hybrids are therefore promising candidates for potential applications in optoelectronic circuits and low cost, high performance, and reliable photodetectors.
- OSTI ID:
- 22395558
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON OXIDES
DENSITY FUNCTIONAL METHOD
ELECTRIC POTENTIAL
EXCITATION
GRAPHENE
INFRARED RADIATION
LASER RADIATION
NANOSTRUCTURES
PHOTODETECTORS
PHOTOSENSITIVITY
POTENTIALS
QUANTUM EFFICIENCY
SHEETS
TIME DEPENDENCE
TUNGSTEN SULFIDES
TWO-DIMENSIONAL SYSTEMS