Abstract
Many researchers have pointed out the advantages of bifacial perovskite/c-Si tandem solar cells, but the theoretical treatment has not been well resolved because of the existence of current matching loss (CML). Here we start from the photovoltaic performance of bifacial sub-cells through graphically analyzing the current characteristics of the sub-cells under bifacial illumination and propose a feasible method to calculate the CML of the bifacial tandem cells. The key success to determine the CML lies in establishing the numerical relationship between the bifacial sub-cells and the bifacial tandem cells according to the strict principle of energy balance. We yield the photovoltaic performance of bifacial perovskite/c-Si tandem solar cells under different perovskite bandgaps and albedos. The reliability of our approach has been demonstrated by comparison with the existing experimental data. We further predict the energy yield and loss of the bifacial tandem solar cell application in different latitudes in the world, and put forward possible solutions for increasing energy yield and reducing energy costs. Our present work establishes the calculation and prediction base of photovoltaic performance of the bifacial perovskite/c-Si tandem solar cells.
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