Designing MoOX/Ag/MoOX sandwich structured buffer layer for four-terminal CsPbI3/TOPCon tandem minimodules
Peer-Reviewed Publication
Updates every hour. Last Updated: 25-Dec-2025 04:11 ET (25-Dec-2025 09:11 GMT/UTC)
A collaborative research team led by the Institute of Physics at the Chinese Academy of Sciences has developed a new “sandwiched” MoOx/Ag/MoOx (MAM) buffer layer to improve the performance and scalability of semi-transparent CsPbI3/TOPCon tandem solar cells. The MAM buffer layer enhances light transmittance and charge carrier transport while effectively protecting underlying layers from sputtering damage. This innovation enabled semi-transparent CsPbI₃ solar cells to achieve a power conversion efficiency (PCE) of 18.86% (0.50 cm²) and corresponding 4-T CsPbI₃/TOPCon tandem cells to reach 26.55% PCE. Significantly, the technology was successfully scaled to larger-area minimodules, achieving 16.67% and 26.41% PCE for CsPbI₃ and 4-T tandem minimodules (6.62 cm²), respectively—marking the first reported minimodule demonstration for this architecture. This work provides a scalable and efficient buffer layer strategy, paving the way for next-generation, high-efficiency perovskite-based photovoltaic systems.
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The research project is supported by a two-year, $1 million grant from the Defense Advanced Research Projects Agency (DARPA).