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首页> 外文期刊>Advanced energy materials >Correlating Phase Behavior with Photophysical Properties in Mixed-Cation Mixed-Halide Perovskite Thin Films
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Correlating Phase Behavior with Photophysical Properties in Mixed-Cation Mixed-Halide Perovskite Thin Films

机译：混合阳离子混合卤化物钙钛矿薄膜中相行为与光物理性质的相关性

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摘要

Mixed cation perovskites currently achieve very promising efficiency and operational stability when used as the active semiconductor in thin-film photovoltaic devices. However, an in-depth understanding of the structural and photophysical properties that drive this enhanced performance is still lacking. Here the prototypical mixed-cation mixed-halide perovskite (FAPbI(3))(0.85)(MAPbBr(3))(0.15) is explored, and temperature-dependent X-ray diffraction measurements that are correlated with steady state and time-resolved photoluminescence data are presented. The measurements indicate that this material adopts a pseudocubic perovskite alpha phase at room temperature, with a transition to a pseudotetragonal beta phase occurring at approximate to 260 K. It is found that the temperature dependence of the radiative recombination rates correlates with temperature-dependent changes in the structural configuration, and observed phase transitions also mark changes in the gradient of the optical bandgap. The work illustrates that temperature-dependent changes in the perovskite crystal structure alter the charge carrier recombination processes and photoluminescence properties within such hybrid organic-inorganic materials. The findings have significant implications for photovoltaic performance at different operating temperatures, as well as providing new insight on the effect of alloying cations and halides on the phase behavior of hybrid perovskite materials.
机译：当在薄膜光伏器件中用作活性半导体时，混合阳离子钙钛矿目前具有非常有前途的效率和操作稳定性。但是，仍然缺乏对驱动这种增强性能的结构和光物理性质的深入了解。本文探讨了典型的混合阳离子混合卤化物钙钛矿（FAPbI（3））（0.85）（MAPbBr（3））（0.15），并研究了与温度相关的与稳态和时间分辨相关的X射线衍射测量呈现了光致发光数据。测量表明，该材料在室温下采用伪立方钙钛矿α相，并在大约260 K处发生向伪四方β相的转变。发现辐射复合速率的温度依赖性与温度的变化相关。结构配置以及观察到的相变也标记了光学带隙梯度的变化。这项工作表明，钙钛矿晶体结构中温度相关的变化会改变这种杂化有机-无机材料中的电荷载流子复合过程和光致发光性质。这些发现对不同工作温度下的光伏性能具有重要意义，并且为阳离子化和卤化合金对钙钛矿杂化材料相行为的影响提供了新的见解。

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