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arXiv · 1608.03920

Perovskite-perovskite tandem photovoltaics with optimized bandgaps

Giles E. Eperon·Tomas Leijtens·Kevin A. Bush·Rohit Prasanna·Thomas Green·Jacob Tse-Wei Wang·David P. McMeekin·George Volonakis·Rebecca L. Milot·Richard May·Axel Palmstrom·Daniel J. Slotcavage·Rebecca A. Belisle·Jay B. Patel·Elizabeth S. Parrott·Rebecca J. Sutton·Wen Ma·Farhad Moghadam·Bert Conings·Aslihan Babayigit·Hans-Gerd Boyen·Stacey Bent·Feliciano Giustino·Laura M. Herz·Michael B. Johnston·Michael D. McGehee·Henry J. Snaith
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Abstract

We demonstrate four and two-terminal perovskite-perovskite tandem solar cells with ideally matched bandgaps. We develop an infrared absorbing 1.2eV bandgap perovskite, $FA_{0.75}Cs_{0.25}Sn_{0.5}Pb_{0.5}I_3$, that can deliver 14.8 % efficiency. By combining this material with a wider bandgap $FA_{0.83}Cs_{0.17}Pb(I_{0.5}Br_{0.5})_3$ material, we reach monolithic two terminal tandem efficiencies of 17.0 % with over 1.65 volts open-circuit voltage. We also make mechanically stacked four terminal tandem cells and obtain 20.3 % efficiency. Crucially, we find that our infrared absorbing perovskite cells exhibit excellent thermal and atmospheric stability, unprecedented for Sn based perovskites. This device architecture and materials set will enable 'all perovskite' thin film solar cells to reach the highest efficiencies in the long term at the lowest costs.

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Giles E. Eperon, Tomas Leijtens, Kevin A. Bush, Rohit Prasanna, Thomas Green, Jacob Tse-Wei Wang, David P. McMeekin, George Volonakis, Rebecca L. Milot, Richard May, Axel Palmstrom, Daniel J. Slotcavage, Rebecca A. Belisle, Jay B. Patel, Elizabeth S. Parrott, Rebecca J. Sutton, Wen Ma, Farhad Moghadam, Bert Conings, Aslihan Babayigit, Hans-Gerd Boyen, Stacey Bent, Feliciano Giustino, Laura M. Herz, Michael B. Johnston, Michael D. McGehee, Henry J. Snaith. 2016-08-12. Perovskite-perovskite tandem photovoltaics with optimized bandgaps. https://doi.org/10.1126/science.aaf9717

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