Radiatve Cooling and Light Enhancement of Transparent Crystalline Si Solar Cells

A light-harvesting film is considered as a means to improve the power conversion efficiency (PCE) of solar cells. However, when a light-harvesting film is applied to transparent solar cells, it is difficult to maintain the transparency of transparent solar cells due to the high haze ratio of the film (>95%). In this study, we apply a light-harvesting film onto the selective area, which is the light absorption region of the c-Si transparent solar cells. As a result, the c-Si transparent solar cells with light-harvesting film exhibited a current density (J_SC) increase of 2.6 mA/cm² compared with the transparent solar cells without a light-harvesting film. Therefore, the best device showed a PCE of 15.8% at an average visible transmittance of 20%, while maintaining a low haze ratio (0.95%). Furthermore, the c-Si transparent solar cells with the light-harvesting film have the advantage of minimizing the PCE degradation depending on the angle of light incidence. In addition, the strategy also helped reduced the temperature increase through the radiative cooling effect.