Photodetectors with Buckminsterfullerene Decorated WSe ₂

In this work, we have studied the interactions of van der Waals (vdWs) hybrid structures composed of two-dimensional tungsten diselenide (WSe 2 ) with zero-dimensional buckminsterfullerene (C 60 ) spheres. The organic-inorganic vdWs heterostructure was fabricated using the spin coated dispersion of C 60 over monolayer WSe 2 crystallites. The morphology of the spin coated C 60 on the surface of monolayer (1L) WSe 2 was studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Raman and photoluminescence spectroscopy were used to reveal the p -type doping of WSe 2 by the C 60 molecules. Photodetector devices were then fabricated with Ti-contacted electrodes and the photodetector figures of merit for WSe 2 and C 60 -WSe 2 hybrids were examined as a function of illumination power and incoming wavelength which showed the C 60 decoration of 1L-WSe 2 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 C 60 -WSe 2 vdWs hybrid heterostructure appears to be an attractive architecture for enabling charge transfer and high performance photodetection capabilities.