# A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells

“A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells” (2016), by David P. McMeekin et al. Engineering research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: David P. McMeekin, Golnaz Sadoughi, Waqaas Rehman, Giles E. Eperon, Michael Saliba, Maximilian T. Hörantner, Amir A. Haghighirad, Nobuya Sakai, Lars Korte, B. Rech et al.
- Published: January 7, 2016
- Field: Engineering
- DOI: https://doi.org/10.1126/science.aad5845
- Source: https://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=88095

## Abstract

Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from ∼20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of ~1.75 electron volts (eV) can be achieved by varying halide composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline and compositionally photostable material, [HC(NH2)2](0.83)Cs(0.17)Pb(I(0.6)Br(0.4))3, with an optical band gap of ~1.74 eV, and we fabricated perovskite cells that reached open-circuit voltages of 1.2 volts and power conversion efficiency of over 17% on small areas and 14.7% on 0.715 cm(2) cells. By combining these perovskite cells with a 19%-efficient silicon cell, we demonstrated the feasibility of achieving >25%-efficient four-terminal tandem cells.

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