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首页> 外文期刊>Advanced energy materials >Rapid Nucleation and Slow Crystal Growth of CsPbI_3 Films Aided by Solvent Molecular Sieve for Perovskite Photovoltaics
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Rapid Nucleation and Slow Crystal Growth of CsPbI_3 Films Aided by Solvent Molecular Sieve for Perovskite Photovoltaics

机译：Rapid Nucleation and Slow Crystal Growth of CsPbI_3 Films Aided by Solvent Molecular Sieve for Perovskite Photovoltaics

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The main reason for large energy loss in all-inorganic perovskites isascribed to the slow nucleation and fast crystallization of all-inorganicperovskite films. Herein, a manipulating strategy is demonstrated tosimultaneously realize rapid nucleation and slow crystal growth of CsPbI_3perovskite films by employing solvent molecular sieves in the antisolvent.First, the antisolvent treatment of mixed chlorobenzene and ethyl alcoholcan induce the instantaneous supersaturation of perovskites to achieverapid nucleation. Subsequently, the molecular layer of phthalimide (2-N)molecules on the perovskite surface can be used as solvent molecularsieves to precisely control the evaporation of the solvent throughmolecule–solvent interactions. In addition, the molecules remainingon the surface can also effectively passivate the surface defects andimprove the device performance. By this strategy, a synchronous regulationof rapid nucleation and slow crystal growth of perovskite films isrealized for the first time. As a result, the CsPbI_3 film with 2-N treatmentpresents high-quality crystallinity with large grains and less defects. Thechampion device exhibits an outdoor power conversion efficiency (PCE)up to 20.14% under AM1.5G illumination, and an indoor PCE up to 40.07%(Pout:133.9 μW cm~(–2)) under a commonly used light-emitting diode lightsource (2956 K, 1062 lux).

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