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Abstract
We analyse the conduction mechanism and the electrical photoresponse of chemical-vapor deposited MoS2 few-layers on SiO2/Si substrate. We perform temperature dependent I-V measurements and report a space-charge limited conduction due to the presence of an exponential distribution of trap states in the MoS2 band-gap. We estimate the density of trap states as 1010 – 1011 cm −2 from the temperature-independent critical drain-source voltage. We also investigate the MoS2 photocurrent under white light at different incident powers. We use a modified Hornbeck-Hayens model to study the photoconductive effect and for an alternative estimation of the trap state density.
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Details
1 PhD student, Physics Department “E. R. Caianiello”, University of Salerno, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy
2 Researcher, CNR-SPIN, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy
3 Researcher, CNR-SPIN, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy; Researcher, Physics Department “E. R. Caianiello”, University of Salerno, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy
4 PhD student, Physics Department “E. R. Caianiello”, University of Salerno, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy; Researcher, CNR-SPIN, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy
5 Associate Professor, Physics Department “E. R. Caianiello”, University of Salerno, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy.