Photodetectors with Buckminsterfullerene Decorated WSe2

Abstract

In this work, we have studied the interactions of van der Waals (vdWs) hybrid structures composed of two-dimensional tungsten diselenide (WSe2) with zero-dimensional buckminsterfullerene (C60) spheres. The organic-inorganic vdWs heterostructure was fabricated using the spin coated dispersion of C60 over monolayer WSe2 crystallites. The morphology of the spin coated C60 on the surface of monolayer (1L) WSe2 was studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Raman and photoluminescence spectroscopy were used to reveal the -type doping of WSe2 by the C60 molecules. Photodetector devices were then fabricated with Ti-contacted electrodes and the photodetector figures of merit for WSe2 and C60-WSe2 hybrids were examined as a function of illumination power and incoming wavelength which showed the C60 decoration of 1L-WSe2 provides an improvement in device performance. Furthermore, the temporal response of the devices was analyzed which showed a reduction in response times by more than two times for the hybrid system. Our results indicate that the C60-WSe2 vdWs hybrid heterostructure appears to be an attractive architecture for enabling charge transfer and high performance photodetection capabilities.