Vicente Juvinch R, Kordesch Martin E, Chen Jixin
Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701, USA.
Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, OH 45701, USA.
J Energy Chem. 2021 Dec;63:8-11. doi: 10.1016/j.jechem.2021.08.046. Epub 2021 Aug 28.
Mixed-halide lead perovskites (MHLPs) are semiconductor materials with bandgaps that are tunable across the visible spectrum and have seen promising applications in photovoltaics and optoelectronics. However, their segregation into phases with enriched halide components, under resonant light illumination and/or electric field, have hindered their practical applications. Herein, we demonstrate the stabilization of the MHLP photoluminescence (PL) peak as a function of their excitation intensities. This effect is associated with the phase segregation of MHLPs and their subsequent remixing by photothermal heating. We conclude that the balance between these opposing processes dictates the equilibrium PL peak of the MHLPs. The findings in this work could serve as a potential approach to obtain MHLP with stable emission peaks under operating conditions.
混合卤化物铅基钙钛矿（MHLPs）是一种半导体材料，其带隙在可见光谱范围内可调，在光伏和光电子领域有着广阔的应用前景。然而，在共振光照射和/或电场作用下，它们会分离成富含卤化物成分的相，这阻碍了它们的实际应用。在此，我们展示了MHLP光致发光（PL）峰随激发强度的稳定情况。这种效应与MHLPs的相分离及其随后通过光热加热的重新混合有关。我们得出结论，这些相反过程之间的平衡决定了MHLPs的平衡PL峰。这项工作中的发现可能为在工作条件下获得具有稳定发射峰的MHLP提供一种潜在方法。
