Fraunhofer Institute for Solar Energy Systems ISEElectron Accumulation across the Perovskite Layer Enhances Tandem Solar Cells with Textured Silicon
The passivated tandem solar cells achieved a conversion efficiency of up to 33.1 percent, with an open-circuit voltage of 2.01 volts.
SCIENCE | 4 Sep 2025 | First Release | DOI: 10.1126/science.adx1745
Reducing charge carrier transport losses, improving selectivity, and minimizing non- radiative recombination are essential for enhancing the efficiency and stability of perovskite/silicon tandem solar cells. We used a hybrid two-step perovskite deposition method that is compatible with industry-standard textured silicon, incorporating a perovskite surface treatment based on 1,3-diaminopropane dihydroiodide. The interaction of this molecule with the perovskite surface increased the majority charge carrier concentration at the electron-selective contact, which reduced interfacial recombination. Simultaneously, this field-effect passivation increased the electron concentration across the entire intrinsic perovskite absorber, which increased conductivity and reduced transport losses. Combined, this yields high-performance, fully-textured perovskite/silicon tandem solar cells, achieving a 1-sun AM1.5G conversion efficiency of 33.1% with an open-circuit voltage of 2.01 volts, and an extended outdoor stability in the Red Sea Coast.
By Oussama Er-raji, Christoph Messmer, Rakesh R. Pradhan, Oliver Fischer, Vladyslav Hnapovskyi, Sofiia Kosar, Marco Marengo, Mathias List, Jared Faisst, José P. Jurado, Oleksandr Matiash, Hannu Pasanen, Adi Prasetio, Badri Vishal, Shynggys Zhumagali, Anil R. Pininti, Yashika Gupta, Clemens Baretzky, Esma Ugur, Christopher E. Petoukhoff, Martin Bivour, Erkan Aydin, Randi Azmi, Jonas Schön, Florian Schindler, Martin C. Schubert, Udo Schwingenschlögl, Frédéric Laquai, Ahmed A. Said, Juliane Borchert, Patricia S. C. Schulze, Stefaan De Wolf, Stefan W. Glunz