Perovskite-perovskite tandem photovoltaics with optimized band gaps
Top Cited Papers
- 18 November 2016
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 354 (6314), 861-865
- https://doi.org/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, 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.Other Versions
Funding Information
- Horizon 2020 (696656 - GrapheneCore1)
- Leverhulme Trust (RL-2012-001)
- UK Engineering and Physical Sciences Research Council (EP/J009857/1, EP/M020517/1)
- European Union Seventh Framework Programme (FP7/2007-2013, 239578 (ALIGN), 604032 (MESO))
- Marie Sklodowska Curie International Fellowship (H2O2IF-GA-2015-659225)
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