Theoretical Efficiency of Nanostructured Graphene-Based Photovoltaics

Graphene-based organic photovoltaics (OPVs) have the potential for single-cell efficiencies exceeding 12% (and 24% in a stacked structure). A generalized equivalent circuit for OPVs is proposed and the validation of the proposed models is verified by simulation. The simulated short-circuit photocurrent density (computed using the simulated incident photon flux density and quantum yield), simulated current-voltage curve, and simulated 3D surface and 2D contour plots of solar-power-con version efficiency versus carrier mobility and photoactive layer thickness are in good agreement with experimental observations. The results suggest that graphene renders a credible material for the construction of next-generation flexible solar-energy-con version devices that are low-cost, high-efficiency, thermally stable, environmentally friendly, and lightweight.