High Efficiency Graphene Solar Cells by Chemical Doping

作者：Xiaochang Miao, Sefaattin Tongay, Maureen K. Petterson, Kara Berke, Andrew G. Rinzler, Bill R. Appleton, Arthur F. Hebard · 发表于：Nano Letters · 年份：2012 · DOI：10.1021/nl204414u · 被引用次数：937 · 研究领域：Silicon and Solar Cell Technologies、Graphene research and applications、Semiconductor materials and interfaces

We demonstrate single layer graphene/n-Si Schottky junction solar cells that under AM1.5 illumination exhibit a power conversion efficiency (PCE) of 8.6%. This performance, achieved by doping the graphene with bis(trifluoromethanesulfonyl)amide, exceeds the native (undoped) device performance by a factor of 4.5 and is the highest PCE reported for graphene-based solar cells to date. Current-voltage, capacitance-voltage, and external quantum efficiency measurements show the enhancement to be due to the doping-induced shift in the graphene chemical potential that increases the graphene carrier density (decreasing the cell series resistance) and increases the cell's built-in potential (increasing the open circuit voltage) both of which improve the solar cell fill factor.