The Retardation Structure for Improvement of Photovoltaic Performances of Dye-Sensitized Solar Cell Under Low Illumination

The predominance for dye-sensitized solar cell (DSSC) is its application in low illumination. However, there are only a few studies to investigate the performance of DSSC under low illumination. In this study, we investigated DSSC's effect on photovoltaic performance under low illumination. The photoelectrode of DSSC is based on titanium dioxide-reduced graphene oxide (RGO)-indium gallium zinc oxide (IGZO) composited photoelectrode, which was fabricated through the hydrothermal method, spin coating, and sputtering. According to our experiments, the improvement in photovoltaic conversion efficiency of DSSC achieved 69.57%, after introducing IGZO and RGO into the photoelectrode. Moreover, the enhancement of photovoltaic conversion efficiency under low illumination is due to the decrease in dark reaction, and the amount of the current is small under low illumination. Thus, in order to increase the photovoltaic conversion efficiency under low illumination, it is crucial to decrease the back reaction or dark reaction.