Functionalized Graphene Superlattice as a Single-Sheet Solar Cell

Given that all of its components would be regularly arranged and chemically connected to each other, a single-sheet solar cell is expected to provide the most control over fl ux of particles and energy compared to the existing architectures made of 2D materials. Functionalized graphene is a promising candidate for such a device, since in addition to the high carrier mobility, large thermal conductivity, and the ability to sustain high densities of electric current, high-quality graphene could be produced by relatively simple and cheap approaches that show promise for large-scale manufacturing. [ 1,11 ] Moreover, by advanced solution processing techniques, chemical functionalization has been realized with both covalently bonded [ 20–24 ] and physisorbed [ 17,25,26 ] molecules, which results in tunable conductivities [ 17,22,23,25 ] and openings of bandgaps. [ 21,23,25,26 ]