Intensive-Light-Induced Backtracking Voltage Phenomenon: An Insight into Intermediate-Band Solar Cell Output Performance

Intermediate-band solar cell is one of the promising concepts to jump out the dilemma of limited efficiency for traditional single junction photovoltaic devices. Albeit fruitful explorations have been done on revealing its working principle and promoting output performance, optical and electrical match of outer system can sometimes get it complicated because of extra below-bandgap photon absorptions. In this study, we reported a voltage backtracking behavior under intensive bi/uni-color irradiation circumstance within this kind of cell. Two different mechanisms are separately disclosed here for the sake of deep understanding how it operates and by which it can better work.