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


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.

DOI: 10.1126/science.aad5845

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@article{McMeekin2016AML, title={A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells.}, author={David P McMeekin and Golnaz Sadoughi and Waqaas Rehman and Giles E Eperon and Michael Saliba and Maximilian T H{\"{o}rantner and Amir Abbas Haghighirad and Nobuya Sakai and Lars Korte and Bernd Rech and Michael B Johnston and Laura M Herz and Henry J Snaith}, journal={Science}, year={2016}, volume={351 6269}, pages={151-5} }