期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703178
关键词
Co partially substituted perovskite; cubic crystal structuresS; large grain size; perovskite solar cells; power conversion efficiency
类别
资金
- National Science Foundation [EECS 1351785]
- Air Force Office of Scientific Research (AFOSR) (Organic Materials Chemistry Program) [FA9550-15-1-0292]
- National Key R&D Program of China [2017YFA0204503]
- National Natural Science Foundation of China [51633006, 51703159, 51733004]
- Strategic Priority Research Program of the Chinese Academy of Science [XDB12030300]
In the past years, hybrid perovskite materials have attracted great attention due to their superior optoelectronic properties. In this study, the authors report the utilization of cobalt (Co2+) to partially substitute lead (Pb2+) for developing novel hybrid perovskite materials, CH(3)NH(3)Pb(1-x)CoxI(3) (where x is nominal ratio, x = 0, 0.1, 0.2 and 0.4). It is found that the novel perovskite thin films possess a cubic crystal structure with superior thin film morphology and larger grain size, which is significantly different from pristine thin film, which possesses the tetragonal crystal structure, with smaller grain size. Moreover, it is found that the 3d orbital of Co2+ ensures higher electron mobilities and electrical conductivities of the CH3NH3Pb1-xCoxI3 thin films than those of pristine CH3NH3Pb4 thin film. As a result, a power conversion efficiency of 21.43% is observed from perovskite solar cells fabricated by the CH3NH3Pb0.9Co0.1I3 thin film. Thus, the utilization of Co, partially substituting for Pb to tune physical properties of hybrid perovskite materials provides a facile way to boost device performance of perovskite solar cells.
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