Inter‐Sample and Intra‐Sample Variability in Electronic Properties of Methylammonium Lead Iodide
Inter‐Sample and Intra‐Sample Variability in Electronic Properties of Methylammonium Lead Iodide
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DOI：
10.1002/adfm.202101843
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发表时间：
2021-03
影响因子：
19
通讯作者：
M. J. Hong;J. Labram
中科院分区：
文献类型：
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作者：
M. J. Hong;J. Labram
虽然与金属卤化物钙钛矿的稳定性相关的挑战是众所周知的并且被深入研究，但是电子性质的可变性代表了同样重要但很少研究的挑战，其可能会减缓或抑制这些系统的商业可行性。在这项工作中，使用非接触式表征技术时间分辨微波电导率（TRMC）来量化不同样品之间以及同一样品内不同位置的原型钙钛矿甲基碘化铅铵（MAPbI 3）的电子特性的变化。使用扫描电子显微镜（SEM）和半自动图像分析策略，可以评估表面微观结构的异质性指标，并将其与TRMC获得的电子特性相关联。在按照不同方案制备的样品和按照相同方案制备的样品中，在迁移率-屈服乘积中观察到显著的样品内和样品间差异。
While the challenges associated with the stability of metal halide perovskites are well known and intensely studied, variability in electronic properties represents an equally significant, yet seldom studied, challenge that could potentially slow or inhibit the commercial viability of these systems. In this work, the contactless characterization technique time‐resolved microwave conductivity (TRMC) is used to quantify the variability in electronic properties of the prototypical perovskite, methylammonium lead iodide (MAPbI3) both between different samples, and at different locations within the same sample. Using scanning electron microscopy (SEM) and a quasi‐automated image‐analysis strategy, it is possible to evaluate the metrics of heterogeneity in surface microstructure and correlate them with the electronic properties as obtained by TRMC. Substantial intra‐sample and inter‐sample variation is observed in the mobility‐yield product in samples prepared following differing protocols, and in samples prepared following identical protocols.