Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 45, Pages 14998-15003Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08790
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Funding
- ANSER Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-SC0001059]
- MRSEC program at the Materials Research Center of the National Science Foundation [NSF DMR-1121262]
- Nanoscale Science and Engineering Center of the National Science Foundation [EEC-0118025/003]
- State of Illinois
- Northwestern University
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Achieving high open-circuit voltage (V-oc) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the V-oc and photovoltaic performance of formamidinium tin iodide (FASnI(3)) perovskite solar cells. The TiO2-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI(3) perovskite solar cell using the cascaded TiO2-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher V-oc of 0.380 V, a short-circuit current density of 23.09 mA cm(-2), and a fill factor of 60.01%. The cascade structure is further validated with a TiO2-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher V-oc.
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