Coupled Slow and Fast Charge Dynamics in Cesium Lead Bromide Perovskite
Coupled Slow and Fast Charge Dynamics in Cesium Lead Bromide Perovskite
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DOI：
10.1021/acsenergylett.6b00722
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发表时间：
2017-01
影响因子：
22
通讯作者：
Ali Moeed Tirmzi;Ryan P Dwyer;T. Hanrath;J. Marohn
中科院分区：
文献类型：
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作者：
Ali Moeed Tirmzi;Ryan P Dwyer;T. Hanrath;J. Marohn
卤化铅钙钛矿表现出缓慢（从几秒到几分钟）和快速（从几毫秒到亚微秒）的电荷动力学。我们使用扫描开尔文探针显微镜和耗散显微镜来探测CsPbBr3薄膜中的电荷动力学。我们证明了CsPbBr3中存在光强度依赖的τfast，它在黑暗中表现出缓慢的、激活的、强度无关的恢复。观测到的τfast虽然高度依赖于光，但在关闭光时基本保持不变，在室温下需要10±2s的弛豫时间。本文给出的数据直接证明，在卤化铅钙钛矿中普遍存在的慢电荷和快电荷动力学具有与高度活化的电荷再分配相关的共同起源。
Lead halide perovskites show slow (from seconds to minutes) and fast (milliseconds to submicroseconds) charge dynamics. We use scanning Kelvin probe microscopy and dissipation microscopy to probe these charge dynamics in a thin film of CsPbBr3. We demonstrate the existence of a light-intensity-dependent τfast in CsPbBr3 that exhibits a slow, activated, intensity-independent recovery in the dark. The observed τfast, while highly light-dependent, remained essentially unchanged when the light was turned off, taking 10 ± 2 s to relax at room temperature. The data presented here show direct evidence that the slow and fast charge dynamics ubiquitously seen in lead-halide perovskites have a common origin related to a highly activated charge redistribution.