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Cation-Exchange-Induced Reversible Conversion between 3D Cubic Perovskite and 2D Layer-Structured Perovskite

王俊慧  Jing Leng  Junxue Liu  Sheng He  Shengye Jin  
【摘要】:Two-dimensional(2D) organolead halide perovskites that incorporate hydrophobic organic interlayers offer improved resistance to degradation by moisture,which are proving to be strong contenders for solar cells and other optoelectronic applications.To explore the factors affecting the optoelectronic properties of these materials,we developed a facile cation-exchange method for the reversible transformation from 3D to hybrid or single phase 2D perovskite films.Based on this method,perovskite components in thin films can be tuned from pure3D to 2D hybrid(containing n =1,2,3 and ∞),and pure single-phase(n=1) by simply adjusting the cation-exchange time.Furthermore,this cation-exchange method is also applicable for the reversible conversion from 2D to 3D perovskite.More importantly,due to the sequential band alignment between different perovskite components in the hybrid 2D perovskite films,the excitons can dissociate by charge transfer into separated electrons and holes with longer lifetimes.Therefore,our cation-exchange reaction will be a promising strategy for 2D perovskite films fabrication and the fabricated hybrid 2D perovskite films with the self-charge-separation property and tunability in perovskite components and carrier dynamics should be more preferred for applications in photovoltaic devices.

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