{"title":"Impact of Hexagonal Boron Nitride Encapsulation on the Photophysical Dynamics of MAPbI3 Perovskite Crystals","authors":"Yong Yang, Ruiyun Chen, Min Yang, Lei Xi, Zhihao Chen, Zhichun Yang, Guofeng Zhang, Chengbing Qin, Jianyong Hu, Liantuan Xiao, Suotang Jia","doi":"10.1021/acs.jpclett.4c03715","DOIUrl":null,"url":null,"abstract":"Metal halide perovskites are known to suffer from instability due to their high sensitivity to external stimuli. Although encapsulation can considerably improve their stability, the impact of encapsulation on the intrinsic photophysical properties of perovskites remains unclear. Here, we investigate the effect of hexagonal boron nitride (hBN) encapsulation on the photoluminescence (PL) dynamics of MAPbI<sub>3</sub> perovskite crystals at the individual crystal level. The results demonstrate that hBN encapsulation leads to PL decline, PL lifetime shortening, and spectral broadening in MAPbI<sub>3</sub> crystals, which can be ascribed to the stress exerted by hBN encapsulation on MAPbI<sub>3</sub> crystals that promotes defect formation and subsequent nonradiative recombination losses. Furthermore, although hBN encapsulation can delay degradation, the effect of hBN-induced stress and the poor sealing due to single-sided encapsulation would further broaden the spectra over time. This work provides new insights into the photophysical effects of encapsulation on perovskites and has significance for the selection of perovskite encapsulation strategies.","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":"69 1","pages":""},"PeriodicalIF":4.8000,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpclett.4c03715","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Metal halide perovskites are known to suffer from instability due to their high sensitivity to external stimuli. Although encapsulation can considerably improve their stability, the impact of encapsulation on the intrinsic photophysical properties of perovskites remains unclear. Here, we investigate the effect of hexagonal boron nitride (hBN) encapsulation on the photoluminescence (PL) dynamics of MAPbI3 perovskite crystals at the individual crystal level. The results demonstrate that hBN encapsulation leads to PL decline, PL lifetime shortening, and spectral broadening in MAPbI3 crystals, which can be ascribed to the stress exerted by hBN encapsulation on MAPbI3 crystals that promotes defect formation and subsequent nonradiative recombination losses. Furthermore, although hBN encapsulation can delay degradation, the effect of hBN-induced stress and the poor sealing due to single-sided encapsulation would further broaden the spectra over time. This work provides new insights into the photophysical effects of encapsulation on perovskites and has significance for the selection of perovskite encapsulation strategies.
期刊介绍:
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.