期刊
ADVANCED MATERIALS
卷 31, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805337
关键词
hybrid perovskites; hydrogen bond dissociation; intrinsic instability; molecule fragmentation; phase transitions
类别
资金
- National Research Foundation of Korea (NRF) grant from the Korean government (MSIT) [2018R1A3B1052820, 2011-0031565, 2015M1A2A2056542]
- brand-project of UNIST [1.180043.01]
- National Research Foundation of Korea [2015M1A2A2056542, 2018R1A3B1052820, 2012M3A6A7054861] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Hybrid lead halide perovskite materials are used in solar cells and show efficiencies greater than 23%. Furthermore, they are applied in light-emitting diodes, X-ray detectors, thin-film transistors, thermoelectrics, and memory devices. Lead trihalide hybrid materials contain methylammonium (MA) or formamidinium (FA) (or a mixture), or long alkylammonium halides, as alternative organic cations. However, the intrinsic stability of hybrid lead halide perovskites is not very high, and they are chemically unstable when exposed to moisture, light, or heat because of their organic contents and low formation energies. Therefore, although improvements in the chemical stability are crucial, changing the material composition is challenging because it is directly related to the desired application requirements. Fortunately, hybrid lead halide perovskites have a very high tolerance toward changes in physical properties arising from doping or addition of different cations and anions, in many cases showing improved properties. Here, the intrinsic instability of hybrid lead halide perovskites is reviewed in relation to the crystal phase and chemical stability. It is suggested that FA should be used for lead halide perovskites for chemical stability instead of MA. Furthermore, additives that stabilize the crystal phase with alpha-FAPbI(3) should eschew MA.
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