Surface electronic structure and dynamics of lead halide perovskites
Surface electronic structure and dynamics of lead halide perovskites
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DOI：
10.1063/5.0019877
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发表时间：
2020-09
期刊：
影响因子：
6.1
通讯作者：
D. Niesner
中科院分区：
文献类型：
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作者：
D. Niesner
在过去的五年里，出现了许多研究，调查了定义明确的卤化铅钙钛矿表面的电子结构。表面及其界面不仅对太阳能电池等器件的性能有相当大的影响，而且还为研究卤化铅钙钛矿的固有电子特性打开了一扇窗户。这对于角分辨光电子能谱尤其如此，角分辨光电子能谱可能是最直接获得材料电子（能带）结构的技术。该技术的泵浦探测版本，双光子光电子能谱，给出了有关飞秒和皮秒电子动力学的光激发。本文综述了使用这些表面敏感技术取得的最新进展。此外，近表面（数百纳米）和深体材料的单晶之间的光学和电子性质的差异进行了讨论。我们指出的关键问题所产生的不同的深度和时间尺度探测，或从不同的环境条件，如温度或周围的大气之间的可比性。
A number of studies investigating the electronic structure of well-defined lead halide perovskite surfaces have emerged in the last five years. Surfaces and their interfaces can not only have considerable effects on the performance of devices such as solar cells but also open a window into the intrinsic electronic properties of lead halide perovskites. This is particularly true for angle-resolved photoelectron spectroscopy, which is possibly the technique giving the most direct access to the electronic (band) structure of a material. The pump–probe version of the technique, two-photon photoelectron spectroscopy, gives information about the femtosecond and picosecond electron dynamics following optical excitation. This review summarizes the recent progress made using these surface-sensitive techniques. In addition, differences between the optical and electronic properties between the near-surface (hundreds of nm) and the deep bulk material of single crystals are discussed. We point out critical issues concerning the comparability between individual results arising from the different depths and timescales probed, or from differing environmental conditions such as the temperature or the surrounding atmosphere.