Abstract

In this study, the theoretical efficiencies of tandem solar cells (TSCs) are investigated through an analysis of various configurations and bandgap combinations. In the results, it is indicated that two‐junction two‐terminal (2J 2T) tandem cells can achieve a maximum efficiency of 45% with subcells exhibiting bandgaps of 1.60 and 0.95 eV, while 2J 4T tandem cells can reach 45.45% efficiency with subcells featuring bandgaps of 1.71 and 0.94 eV. Additionally, 3J 2T TSCs maintain a peak efficiency of 51.19%, utilizing subcells with bandgaps of 1.91, 1.38, and 0.94 eV, while 3J 6T tandem cells exhibit an efficiency peak at 51.49% with subcells showcasing bandgaps of 2.07, 1.39, and 0.93 eV. In this study, a roadmap is offered for optimizing bandgap combinations in TSCs, underscoring the critical role of bandgap engineering in the pursuit of higher solar cell efficiencies. The identified optimal bandgap pairing paves the way for future developments in solar cell technology.