Journal
SCIENCE
Volume 354, Issue 6309, Pages 206-209Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aah5557
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Funding
- Marie Sklodowska Curie fellowship [665667]
- European Union's Seventh Framework Programme for research, technological development, and demonstration [291771]
- Swiss National Science Foundation - Umbrella project [407040-153952, 407040-153990, 200021-157135/1]
- NRP 70 Energy Turnaround
- 9th call proposal 906: CONNECT PV
- SNF-NanoTera
- Swiss Federal Office of Energy (SYNERGY)
- King Abdulaziz City for Science and Technology
- Swiss National Science Foundation (SNF) [407040_153990, 407040_153952] Funding Source: Swiss National Science Foundation (SNF)
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All of the cations currently used in perovskite solar cells abide by the tolerance factor for incorporation into the lattice. We show that the small and oxidation-stable rubidium cation (Rb+) can be embedded into a cation cascade to create perovskite materials with excellent material properties. We achieved stabilized efficiencies of up to 21.6% (average value, 20.2%) on small areas (and a stabilized 19.0% on a cell 0.5 square centimeters in area) as well as an electroluminescence of 3.8%. The open-circuit voltage of 1.24 volts at a band gap of 1.63 electron volts leads to a loss in potential of 0.39 volts, versus 0.4 volts for commercial silicon cells. Polymer-coated cells maintained 95% of their initial performance at 85 degrees C for 500 hours under full illumination and maximum power point tracking.
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