Perovskite-perovskite tandem photovoltaics with optimized band gaps

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

doi:10.1126/science.aaf9717

Perovskite-perovskite tandem photovoltaics with optimized band gaps

Science. 2016 Nov 18;354(6314):861-865. doi: 10.1126/science.aaf9717. Epub 2016 Oct 20.

Authors

Giles E Eperon^{1

2}, Tomas Leijtens³, Kevin A Bush³, Rohit Prasanna³, Thomas Green¹, Jacob Tse-Wei Wang¹, David P McMeekin¹, George Volonakis⁴, Rebecca L Milot¹, Richard May², Axel Palmstrom⁵, Daniel J Slotcavage³, Rebecca A Belisle³, Jay B Patel¹, Elizabeth S Parrott¹, Rebecca J Sutton¹, Wen Ma⁶, Farhad Moghadam⁶, Bert Conings^{1

7}, Aslihan Babayigit^{1

7}, Hans-Gerd Boyen⁷, Stacey Bent⁵, Feliciano Giustino⁴, Laura M Herz¹, Michael B Johnston¹, Michael D McGehee⁸, Henry J Snaith⁹

Affiliations

¹ Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK.
² Department of Chemistry, University of Washington, Seattle, WA, USA.
³ Department of Materials Science, Stanford University, Lomita Mall, Stanford, CA, USA.
⁴ Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
⁵ Department of Chemical Engineering, Stanford University, Via Ortega, Stanford, CA, USA.
⁶ SunPreme, Palomar Avenue, Sunnyvale, CA, USA.
⁷ Institute for Materials Research, Hasselt University, Diepenbeek, Belgium.
⁸ Department of Chemistry, University of Washington, Seattle, WA, USA. mmcgehee@stanford.edu henry.snaith@physics.ox.ac.uk.
⁹ Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK. mmcgehee@stanford.edu henry.snaith@physics.ox.ac.uk.

PMID: 27856902
DOI: 10.1126/science.aaf9717

Abstract

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, FA_0.75Cs_0.25Sn_0.5Pb_0.5I₃, that can deliver 14.8% efficiency. By combining this material with a wider-band gap FA_0.83Cs_0.17Pb(I_0.5Br_0.5)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.

Publication types

Research Support, Non-U.S. Gov't