Imaging Carrier Transport Properties in Halide Perovskites using Time-Resolved Optical Microscopy
Imaging Carrier Transport Properties in Halide Perovskites using Time-Resolved Optical Microscopy
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DOI：
10.1002/aenm.201903814
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发表时间：
2020-02-12
影响因子：
27.8
通讯作者：
Stranks, Samuel D.
中科院分区：
文献类型：
--
作者：
Delport, Geraud;Macpherson, Stuart;Stranks, Samuel D.
卤化物钙钛矿对于相对粗加工的半导体具有显著的性质，包括大的光吸收系数和长的电荷载流子寿命。由于这些特性，这些材料现在正在与成熟的技术竞争，用于具有成本效益和高效的光捕获和发光设备。然而，在这些材料中的电荷载流子的行为的基本理解，特别是在纳米到微米尺度上，总的来说，落后于经验器件的性能。这种理解对于控制电荷载流子、开发新的器件结构以及将器件推向其性能极限至关重要。在其他工具中，光学显微镜和光谱技术揭示了关于重要长度尺度上的电荷载流子复合和传输的丰富信息。在这份进展报告中，详细介绍了时间分辨光学显微镜技术对集体理解这些材料的光物理学的贡献。正在进行的技术发展领域，克服传统的实验限制，以可视化传输特性在多个时间和长度尺度进行了讨论。最后，策略提出了联合收割机光学显微镜与互补技术，以获得一个整体的图片，当地的载体电子物理在国家的最先进的钙钛矿设备。
Halide perovskites have remarkable properties for relatively crudely processed semiconductors, including large optical absorption coefficients and long charge carrier lifetimes. Thanks to such properties, these materials are now competing with established technologies for use in cost-effective and efficient light-harvesting and light-emitting devices. Nevertheless, the fundamental understanding of the behavior of charge carriers in these materials-particularly on the nano- to microscale-has, on the whole, lagged behind empirical device performance. Such understanding is essential to control charge carriers, exploit new device structures, and push devices to their performance limits. Among other tools, optical microscopy and spectroscopic techniques have revealed rich information about charge carrier recombination and transport on important length scales. In this progress report, the contribution of time-resolved optical microscopy techniques to the collective understanding of the photophysics of these materials is detailed. The ongoing technical developments in the field that are overcoming traditional experimental limitations in order to visualize transport properties over multiple time and length scales are discussed. Finally, strategies are proposed to combine optical microscopy with complementary techniques in order to obtain a holistic picture of local carrier photophysics in state-of-the-art perovskite devices.