Enhanced recovery of light-induced degradation on the micromorph solar cells by reverse bias

Abstract

The recovery of light-induced degradation of the tandem micromorph solar cells by applying reverse bias is compared with the single junction a-Si solar cells for the first time. The illuminated current density-voltage characteristics and external quantum efficiency show that the degraded efficiency of both the micromorph and a-Si solar cells can be recovered by applying sufficient reverse bias. The micromorph solar cells can be recovered with smaller reverse bias as compared with a-Si solar cells. The simulation and experimental results show that higher hydrogen concentration in the bottom cell of the micromorph solar cells can help accelerate the recovery process