• Mariotti, S.; Köhnen, E.; Scheler, F.; Sveinbjörnsson, K.; Zimmermann, L.; Piot, M.; Yang, F.; Li, B.; Warby, J.; Musiienko, A.; Menzel, D.; Lang, F.; Keßler, S.; Levine, I.; Mantione, D.; Al-Ashouri, A.; Härtel, M.S.; Xu, K.; Cruz, A.; Kurpiers, J.; Wagner, P.; Köbler, H.; Li, J.; Magomedov, A.; Mecerreyes, D.; Unger, E.; Abate, A.; Stolterfoht, M.; Stannowski, B.; Schlatmann, R.; Korte, L.; Albrecht, S.: Interface engineering for high-performance, triple-halide perovskite–silicon tandem solar cells. Science 381 (2023), p. 63-69


Improved stability and efficiency of two-terminal monolithic perovskite-silicon tandem solar cells will require reductions in recombination losses. By combining a triple-halide perovskite (1.68 electron volt bandgap) with a piperazinium iodide interfacial modification, we improved the band alignment, reduced nonradiative recombination losses, and enhanced charge extraction at the electron-selective contact. Solar cells showed open-circuit voltages of up to 1.28 volts in p-i-n single junctions and 2.00 volts in perovskite-silicon tandem solar cells. The tandem cells achieve certified power conversion efficiencies of up to 32.5%.