期刊
SCIENCE ADVANCES
卷 3, 期 8, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1701293
关键词
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资金
- Argonne-Northwestern Solar Energy Research Center
- Energy Frontier Research Center - U.S. Department of Energy, Office of Science
- Office of Basic Energy Sciences [DE-SC0001059]
- Materials Research Science and Engineering Center program at the Materials Research Center [NSF DMR-1121262]
- Nanoscale Science and Engineering Center [EEC-0118025/003]
- NSF
- State of Illinois
- Northwestern University
- U.S. Department of Energy (DOE) [DE-SC0001059] Funding Source: U.S. Department of Energy (DOE)
Perovskite solar cells have revolutionized the fabrication of solution-processable solar cells. The presence of lead in the devices makes this technology less attractive, and alternative metals in perovskites are being researched as suitable alternatives. We demonstrate a new type of tin-based perovskite absorber that incorporates both ethylenediammonium (en) and formamidinium (FA), forming new materials of the type {en}FASnI(3). The three-dimensional ASnI(3) structure is stable only with methylammonium, FA, and Cs cations, and the bandgap can be tuned with solid solutions, such as ASnI(3-x)Br(x). We show that en can serve as a new A cation capable of achieving marked increases in the bandgap without the need for solid solutions. The en introduces a new bandgap tuning mechanism that arises from massive Schottky style defects. In addition, incorporation of the en cation in the structure markedly increases the air stability and improves the photoelectric properties of the tin-based perovskite absorbers. Our best-performing {en}FASnI(3) solar cell has the highest efficiency of 7.14%, which is achieved for a lead-free perovskite cell, and retains 96% of its initial efficiency after aging over 1000 hours with encapsulation. Our results introduce a new approach for improving the performance and stability of tin-based, lead-free perovskite solar cells.
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