钙钛矿(结构)
深能级瞬态光谱
材料科学
介电谱
离子键合
离子
光谱学
光电子学
太阳能电池
卤化物
分析化学(期刊)
化学物理
化学
物理化学
结晶学
无机化学
物理
硅
色谱法
量子力学
有机化学
电极
电化学
作者
Sebastian Reichert,Jens Flemming,Qingzhi An,Yana Vaynzof,Jan‐Frederik Pietschmann,Carsten Deibel
出处
期刊:Physical review applied
[American Physical Society]
日期:2020-03-06
卷期号:13 (3)
被引量:48
标识
DOI:10.1103/physrevapplied.13.034018
摘要
One of the key challenges for future development of efficient and stable metal halide perovskite solar cells is related to the migration of ions in these materials. Mobile ions have been linked to the observation of hysteresis in the current--voltage characteristics, shown to reduce device stability against degradation and act as recombination centers within the band gap of the active layer. In the literature one finds a broad spread of reported ionic defect parameters (e.g. activation energies) for seemingly similar perovskite materials, rendering the identification of the nature of these species difficult. In this work, we performed temperature dependent deep-level transient spectroscopy (DLTS) measurements on methylammonium lead iodide perovskite solar cells and developed a extended regularization algorithm for inverting the Laplace transform. Our results indicate that mobile ions form a distribution of emission rates (i.e. a distribution of diffusion constants) for each observed ionic species, which may be responsible for the differences in the previously reported defect parameters. Importantly, different DLTS modes such as optical and current DLTS yield the same defect distributions. Finally the comparison of our results with conventional boxcar DLTS and impedance spectroscopy (IS) verifies our evaluation algorithm.
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