Perovskite-perovskite tandem photovoltaics with optimized band gaps

@article{Eperon2016PerovskiteperovskiteTP,
  title={Perovskite-perovskite tandem photovoltaics with optimized band gaps},
  author={Giles E. Eperon and Tomas Leijtens and Kevin A Bush and Rohit Prasanna and Thomas Green and Jacob Tse-Wei Wang and David P. McMeekin and George Volonakis and Rebecca L. Milot and Richard May and Axel F. Palmstrom and Daniel J. Slotcavage and Rebecca A. Belisle and Jay B. Patel and Elizabeth S Parrott and Rebecca J. Sutton and Wen Ma and Farhad Moghadam and Bert Conings and Aslihan Babayigit and Hans Gerd Boyen and Stacey F. Bent and Feliciano Giustino and Laura M. Herz and Michael B. Johnston and Michael D. McGehee and Henry J. Snaith},
  journal={Science},
  year={2016},
  volume={354},
  pages={861 - 865}
}
Tandem perovskite cells The ready processability of organic-inorganic perovskite materials for solar cells should enable the fabrication of tandem solar cells, in which the top layer is tuned to absorb shorter wavelengths and the lower layer to absorb the remaining longer-wavelength light. The difficulty in making an all-perovskite cell is finding a material that absorbs the red end of the spectrum. Eperon et al. developed an infrared-absorbing mixed tin-lead material that can deliver 14.8… 
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