Top-grid monolayer graphene/Si Schottkey solar cell

Monolayer graphene/Si Schottkey solar cell was fabricated using a top-grid structure. In comparison with the prevailing top-window structure, the newly-designed device structure has simplified the fabrication procedures to avoid ultraviolet (UV) photolithography and SiO2-eching. We systematically investigated the effect of chemical doping as well as device area on the device performance. It was found that a power conversion efficiency (PCE) of 5.9% can be achieved by engineering the work function of graphene through chemical doping. Our study indicates that top grid structure is suitable to make low-cost, large area and high efficiency graphene/Si Schottkey solar cell. (C) 2014 Elsevier Inc. All rights reserved.