High Temperature Deposited TCO Recombination Layer for Perovskite/TOPCon Tandem Solar Cells with Efficiency Exceeding 31.7%

In monolithic perovskite/TOPCon tandem solar cells, it is crucial to manage the recombination of oppositely charged carriers generated in the two sub-cells. This recombination process significantly affects the current matching and electrical behavior between the two sub-cells. In this study, we introduced a high-temperature deposited transparent conductive oxide (TCO1) recombination layer, providing both low sheet resistance and high transmittance properties. Such high-temperature deposition process results in strong crystalline features of the TCO1 layer, which have a notable impact on the adsorption ability of 2-(9H -carbazol-9-yl) ethyl phosphonic acid (2PACz) on the TC01 layer, thereby accelerating the carrier recombination. As a result, an impressive fill factor of 80.68% and an efficiency of 31.72% have been achieved for a perovskite/TOPCon tandem solar cell, with signicificant potential for future improvements.