Highly designed photovoltaic modules using black back sheet with IR reflection

Abstract The purpose of this study is to improve both the design of photovoltaic (PV) modules and their efficiency by utilizing long-wavelength light. A black back sheet (BS) with IR reflection was examined for this purpose. In this study, the damp heat (DH) test, thermal cycle (TC) test, and light irradiation test were carried out for crystalline Si PV modules using black BS without light reflection, black BS with IR reflection, and conventional white BS. The external quantum efficiency of perovskite/Si tandem PV modules was measured to confirm the effective utilization of long-wavelength light. Suppression of the decrease in both open-circuit voltage and fill factor was achieved using black BS with IR reflection by mitigating the elevation of cell temperature. These results suggested the long-term reliability of black BS with IR reflection against the DH test, TC test, and light irradiation test, and its effectiveness for perovskite/Si tandem PV modules.