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Tunable bandgap and spin-orbit coupling by composition control of MoS2 and MoOx (x = 2 and 3) thin film compounds
, Article Materials and Design ; Volume 122 , 2017 , Pages 220-225 ; 02641275 (ISSN) ; Mohseni, S. M ; Jamilpanah, L ; Mohammadbeigi, M ; Sangpour, P ; Hosseini, S. A ; Iraji Zad, A ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
We report on the MoS2 and MoOx (x = 2 and 3) composite thin layers, electrodeposited, onto a Florine doped Tin Oxide (FTO) substrate. Our results show a change in relative content of these compounds in different thicknesses ranging from ∼20 to 540 nm. This change in the relative content at different thicknesses leads to a change in optical and electrical properties including bandgap and the type of semiconductivity. A sharp transition from p to n-type of semiconductivity is observed by scanning tunneling spectroscopy measurements. We find that the spin-orbit interaction of Mo 3d electrons in the MoS2 and MoO3 enhances by significant reduction of the MoO3 content in thicker layers. © 2017...