Photoconductivity enhancement in MoS2 and WSe2 hybrids aided by light-absorbing carbon-based zero-dimensional quantum dots

Abstract

In this study, we present the study of van der Waal (vdW) hybrid structure of zero-dimensional graphene quantum dots (GQDs) and fullerene (C60) in conjunction with two-dimensional molybdenum disulphide (MoS2) and tungsten diselenide (WSe2) semiconducting transition metal dichalcogenides (TMDs). The vdW hybrid structures were characterized by Raman and photoluminescence (PL) spectroscopy which have revealed n-type doping occurring in MoS2 after decoration of GQDs, and a p-type doping occurring in WSe2 after decoration of C60. After outlining the fabrication of our 0D-2D heterostructure photodetectors, their photo response to incoming radiation was measured using broadband illumination which has revealed a two-fold increase in photo response in MoS2 and a three-fold increase in WSe2 after decoration with GQDs and C60, respectively. Our results presented here provide insights into 2D and 0D-based hybrid structures, thus enabling platform for high-performance photodetectors.