Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 38, Pages 12360-12363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08337
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Funding
- U.S. Department of Energy (DOE) SunShot Initiative [DE-FOA-0000990]
- National Science Foundation [CHE-1230246, DMR-1534686]
- Ohio Research Scholar Program
- U.S. Department of Energy SunShot Initiative [DE-FOA-0000990, DE-AC36-08-GO28308]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Natural Science Foundation of China (NSFC) [91422301, 21427801]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1230246] Funding Source: National Science Foundation
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Mixed tin (Sn)-lead-Pb) perovskites with high Sn content exhibit low bandgaps suitable for fabricating the bottom cell of perovskite-based tandem solar cells. In this work, we report on the fabrication of efficient mixed Sn-Pb perovskite solar cells using precursors combining formamidinium tin iodide (FASnI(3)) and methylammonium lead iodide (MAPbI-3). The best-performing cell fabricated using a (FASnI(3))(0.6)(MAPbI(3))(0.4) absorber with an absorption edge of similar to 1.2 eV achieved a power conversion efficiency (PCE) of 15.08 (15.00)% with an open-circuit voltage of 0.795 (0.799) V, a short-circuit current density of 26.86(26.82) mA/cm(2), and a fill factor of 70.6(70.0)% when measured under forward (reverse) voltage scan. The average PCE of 50 cells we have fabricated is 14.39 +/- 0.33%, indicating good reproducibility.
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