Back to Search
Start Over
Layer-dependent photoresponse of 2D MoS2 films prepared by pulsed laser deposition.
- Source :
- Journal of Materials Chemistry C; 3/7/2019, Vol. 7 Issue 9, p2522-2529, 8p
- Publication Year :
- 2019
-
Abstract
- Due to the layered structure and thickness-dependent bandgap of MoS<subscript>2</subscript>, it is intriguing to investigate the layer-dependent performance of MoS<subscript>2</subscript> based photodetectors. In this work, centimeter-scale layered MoS<subscript>2</subscript> films with different layer numbers are achieved by using pulsed laser deposition by controlling the number of laser pulses. The measurement of transport characteristics in the dark indicates a Schottky barrier contact formed at the Au/MoS<subscript>2</subscript> interface. The obtained metal–semiconductor–metal MoS<subscript>2</subscript> based photodetectors present a UV-to-NIR photoresponse with high stability. When the thickness of the film is decreased, the photoresponse of the MoS<subscript>2</subscript> photodetectors gradually increases from multilayer to bilayer, and more importantly, a notable enhancement in the photoresponse for the monolayer can be observed. In particular, a photoresponsivity of 1.96 A W<superscript>−1</superscript> is achieved in monolayer MoS<subscript>2</subscript> samples under illumination with a wavelength of 300 nm. The physical mechanism responsible for the observation is discussed based on the layer dependent Schottky barrier variation and the indirect-to-direct energy band transition in MoS<subscript>2</subscript>. Our work provides an insight into layer-dependent optical behavior in MoS<subscript>2</subscript> films, which should be helpful for developing further large-scale photosensing applications in the atomic limit. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 7
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 135010893
- Full Text :
- https://doi.org/10.1039/c8tc04612c