Comprehensive Elucidation of Ion Transport and Its Relation to Hysteresis in Methylammonium Lead Iodide Perovskite Thin Films
Comprehensive Elucidation of Ion Transport and Its Relation to Hysteresis in Methylammonium Lead Iodide Perovskite Thin Films
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DOI：
10.1021/acs.jpcc.8b11285
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
H. Khassaf;Srinivas K. Yadavalli;Onkar S. Game;Yuanyuan Zhou;N. Padture;A. Kingon
中科院分区：
文献类型：
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作者：
H. Khassaf;Srinivas K. Yadavalli;Onkar S. Game;Yuanyuan Zhou;N. Padture;A. Kingon
研究了CH_3NH_3PbI_3有机-无机卤化物钙钛矿（OIHP）薄膜的“暗”电流-电压（I-V）响应随温度、电压和扫描速率的变化，以研究I-V滞后的性质.这是为了解决在I-V滞后特性中观察到的明显差异。取决于测量条件，出现两种互补机制来控制I-V行为。首先，离子物质有助于传导，并且由于它们的缓慢移动性质，较慢的扫描速率给予离子足够的时间来参与传导（即，低于弛豫频率）。第二，离子物质向界面的迁移调节肖特基结，并因此调节跨界面的电子传输。因此，较慢的扫描速率导致界面处更多的电荷累积，这导致漏电流的减小。这些研究结果提供了一个解释，解决了正在进行的辩论的特点，我…
The “dark” current–voltage (I–V) response of CH3NH3PbI3 organic–inorganic halide perovskite (OIHP) thin films is studied as a function of temperature, voltage, and scan rate to investigate the nature of the I–V hysteresis. This is to address the apparent discrepancy observed in characteristics of the I–V hysteresis. Depending on the measurement conditions, two complementary mechanisms appear to control the I–V behavior. First, ionic species contribute to the conduction, and because of their slow-moving nature, a slower scan rate gives ions enough time to take part in conduction (i.e., below a relaxation frequency). Second, migration of ionic species to the interface(s) modulates the Schottky junction and, consequently, the electronic transport across the interfaces. Therefore, a slower scan rate results in more charge accumulation at the interface, which leads to a decrease in the leakage current. These findings provide an explanation that resolves the ongoing debate regarding the characteristics of the I...