期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201907442
关键词
FAPbI(3); high performance; hybrid perovskite solar cells; in situ grazing incidence wide angle x-ray scattering; quartz-crystal microbalance; two-step conversion
类别
资金
- King Abdullah University of Science and Technology (KAUST)
- Key Program project of the National Natural Science Foundation of China [51933010]
- National Natural Science Foundation of China [61974085, 61604092]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ6040]
- NSF [DMR-1332208]
The two-step conversion process consisting of metal halide deposition followed by conversion to hybrid perovskite has been successfully applied toward producing high-quality solar cells of the archetypal MAPbI(3) hybrid perovskite, but the conversion of other halide perovskites, such as the lower bandgap FAPbI(3), is more challenging and tends to be hampered by the formation of hexagonal nonperovskite polymorph of FAPbI(3), requiring Cs addition and/or extensive thermal annealing. Here, an efficient room-temperature conversion route of PbI2 into the alpha-FAPbI(3) perovskite phase without the use of cesium is demonstrated. Using in situ grazing incidence wide-angle X-ray scattering (GIWAXS) and quartz crystal microbalance with dissipation (QCM-D), the conversion behaviors of the PbI2 precursor from its different states are compared. alpha-FAPbI(3) forms spontaneously and efficiently at room temperature from P-2 (ordered solvated polymorphs with DMF) without hexagonal phase formation and leads to complete conversion after thermal annealing. The average power conversion efficiency (PCE) of the fabricated solar cells is greatly improved from 16.0(+/- 0.32)% (conversion from annealed PbI2) to 17.23(+/- 0.28)% (from solvated PbI2) with a champion device PCE > 18% due to reduction of carrier recombination rate. This work provides new design rules toward the room-temperature phase transformation and processing of hybrid perovskite films based on FA(+) cation without the need for Cs+ or mixed halide formulation.
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