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.

Details

Title
Space charge limited current and photoconductive effect in few-layer MoS2
Author
Grillo, A 1 ; Giubileo, F 2 ; Iemmo, L 3 ; Luongo, G 4 ; Urban, F 4 ; A Di Bartolomeo 5 

 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 
 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 
 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 
 Associate Professor, Physics Department “E. R. Caianiello”, University of Salerno, via Giovanni Paolo II 132, Fisciano 84084, Salerno, Italy. 
Publication year
2019
Publication date
May 2019
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2566176326
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.