Perovskite/c-Si Monolithic Tandem Solar Cells under Real Solar Spectra: Improving Energy Yield by Oblique Incident Optimization

Abstract

Many research groups have noticed the performance of rapidly-developed perovskite/silicon monolithic tandem solar cells (TSCs) under real situation, but they overlook the short-current density mismatch of two sub-cells at different times in a day and the spectrum variation at different latitudes. Here we have systematically analyzed the efficiency losses and proposed optimization scheme by combination of experiment and simulation relying on reliable experimental data in a year. We have verified the simulated absorptance spectra varying with incident angle θ to substitute the external quantum efficiency spectra, which makes the optimization at oblique incidence possible. More importantly, we have further calculated and expanded the optimized current losses and energy output enhancement in perovskite/silicon monolithic TSCs to all latitudes. This work can be served as a practical guidance for the design of perovskite/silicon monolithic TSCs with the best annual energy output at different latitudes in the world.