Comprehensive voltage-loss analysis and reduction of radiative recombination voltage loss in quantum-structured solar cells
Meita Asami, Maui Hino, Li Gan, Kentaroh Watanabe, Yoshiaki Nakano, Masakazu Sugiyama
Abstract
Voltage-loss analysis is essential in the development of next-generation solar cells, such as perovskite, chalcopyrite, kesterite, and nano/quantum-structured solar cells. Voltage-loss analysis provides valuable insights into how the energy conversion efficiency of solar cells can be enhanced. However, a comprehensive and accurate method to evaluate the voltage loss in quantum-structured solar cells is lacking. This study establishes and demonstrates a quantitative voltage-loss analysis based on detailed balance theory. This analysis reveals the relationship between external quantum efficiency and radiative recombination voltage loss in quantum-structured solar cells. Based on the results of the analysis, we designed and fabricated a novel low-voltage loss quantum-structured solar cell. Radiative recombination in the quantum-structured solar cell was successfully suppressed by steepening the absorption edge. This voltage-loss analysis facilitates the development of next-generation solar cells.