Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep35705
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Funding
- National Natural Science Foundation of China [51672111]
- 973 program early projects [2014CB260405]
- Advanced Talents Program of Hebei Province [GCC2014013]
- Top Young Outstanding Innovative Talents Program of Hebei Province [BJ2014009]
- Natural Science Foundation of Hebei Province [F2015201189]
- 100 Talents Program of Hebei Province [E2014100008]
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Despite organometal halide perovskite solar cells have recently exhibited a significant leap in efficiency, the Sn-based perovskite solar cells still suffer from low efficiency. Here, a series homogeneous CH3NH3Pb(1-x) SnxI3 (0 <= x <= 1) perovskite thin films with full coverage were obtained via solvent engineering. In particular, the intermediate complexes of PbI2/(SnI2)center dot(DMSO)(x) were proved to retard the crystallization of CH3NH3SnI3, thus allowing the realization of high quality Sn-introduced perovskite thin films. The external quantum efficiency (EQE) of as-prepared solar cells were demonstrated to extend a broad absorption minimum over 50% in the wavelength range from 350 to 950 nm accompanied by a noteworthy absorption onset up to 1050 nm. The CH3NH3Pb0.75Sn0.25I3 perovskite solar cells with inverted structure were consequently realized with maximum power conversion efficiency (PCE) of 14.12%.
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