期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 1, 页码 388-393出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10898
关键词
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资金
- Northwestern University
- Ministry of Science and Technology of Taiwan (MOST)
- ANSER Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001059]
- Nanoscale Science and Engineering Center of the National Science Foundation [EEC-0118025/003]
- State of Illinois
- ANSER Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science [DE-SC0001059]
- MRSEC program at the Materials Research Center of the National Science Foundation [NSF DMR-1121262]
Developing dopant-free hole transporting layers (HTLs) is critical in achieving high-performance and robust state-of-the-art perovskite photovoltaics, especially for the air-sensitive tin-based perovskite systems. The commonly used HTLs require hygroscopic dopants and additives for optimal performance, which adds extra cost to manufacturing and limits long-term device stability. Here we demonstrate the use of a novel tetrakistriphenylamine (TPE) small molecule prepared by a facile synthetic route as a superior dopant-free HTL for lead-free tin-based perovskite solar cells. The best-performing tin iodide perovskite cells employing the novel mixed-cation ethylenediammonium/formamidinium with the dopant-free TPE HTL achieve a power conversion efficiency as high as 7.23%, ascribed to the HTL's suitable band alignment and excellent hole extraction/collection properties. This efficiency is one of the highest reported so far for tin halide perovskite systems, highlighting potential application of TPE HTL material in low-cost high-performance tin-based perovskite solar cells.
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