Perovskite-perovskite tandem photovoltaics with optimized band gaps

By G. Eperon, T. Leijtens, Kevin A. Bush, R. Prasanna, Thomas Green, Jacob Tse-Wei Wang, David P. McMeekin, G. Volonakis, R. Milot, Richard May and 17 more. Science, 2016

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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% efficiency on its own and 20.3% efficiency in a four-terminal tandem cell. Science, this issue p. 861 A mixed tin-lead perovskite material with a narrow band gap enables efficient tandem solar cells. We demonstrate four- and two-terminal perovskite-perovskite tandem solar cells with ideally matched band gaps. We develop an infrared-absorbing 1.2–electron volt band-gap perovskite, FA0.75Cs0.25Sn0.5Pb0.5I3, that can deliver 14.8% efficiency. By combining this material with a wider–band gap FA0.83Cs0.17Pb(I0.5Br0.5)3 material, we achieve monolithic two-terminal tandem efficiencies of 17.0% with >1.65-volt open-circuit voltage. We also make mechanically stacked four-terminal tandem cells and obtain 20.3% efficiency. Notably, we find that our infrared-absorbing perovskite cells exhibit excellent thermal and atmospheric stability, not previously achieved 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.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/e85143850146307f107d81a12e153c27693a4ab3

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In Electrical and Electronic Engineering

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  3. M. McGehee
  4. Anyi Mei
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  6. T. Stergiopoulos
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In Polymers and Plastics

  1. Edward H. Sargent
  2. K. Zhu
  3. M. McGehee
  4. Anyi Mei
  5. Qiquan Qiao
  6. Yaoguang Rong
  7. S. Seok
  8. J. Troughton

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