Top-grid monolayer graphene/Si Schottkey solar cell

• Monolayer graphene/Si Schottkey solar cell was fabricated.
• Chemical doping can effectively tune the work function of graphene film.
• Chemical doping has significant effect on the device performance.
• The top-grid device structure with graphene is promising with low-cost and high efficiency.

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.

The engineering of the work function of graphene through chemical doping is an effective approach to improve the performance of monolayer graphene/Si Schottky solar cell.Figure optionsDownload as PowerPoint slide