Controlling the charge carrier dynamics by modulating the orientation diversity of perovskites
Controlling the charge carrier dynamics by modulating the orientation diversity of perovskites
复制标题
通过调节钙钛矿的取向多样性来控制载流子动力学
DOI：
10.1039/d1qm01586a
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Hideo Ohkita and Dongho Kim
中科院分区：
文献类型：
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作者：
Wonhee Cha;Won-Young Cha;Insub Noh; Shu Seki; Hideo Ohkita and Dongho Kim
有机-无机卤化物钙钛矿基太阳能电池在最近几十年中得到了极大的改进，功率转换效率高达25%。然而，其优异性能背后的基本物理性质尚未阐明。在这里，我们研究了详细的光致载流子动力学在一个宽的时间域从亚纳秒到微秒，通过时间相关的单光子计数和闪光光解时间分辨微波电导率测量。钙钛矿的结构显著影响移动的电荷载流子的整个周期动力学。与高度取向的钙钛矿相比，在具有更高取向多样性的钙钛矿中，迁移率显著更大，并且更有效地发生对传输层的提取，从而导致更高的效率。研究了钙钛矿的取向多样性与其能量转换效率之间的关系。本文的工作将有助于高效太阳能电池器件的研制。
Organic–inorganic halide perovskite-based solar cells have drastically improved in recent decades, with power conversion efficiencies of up to 25%. However, the fundamental photophysical properties underlying the outstanding performance have not been elucidated. Herein, we investigate the detailed photo-induced charge carrier dynamics over a wide time domain from sub-nanoseconds to microseconds, via time-correlated single photon counting and flash photolysis time-resolved microwave conductivity measurements. The structure of the perovskites significantly influences the whole periodic dynamics of mobile charge carriers. The mobility was considerably larger and the extraction to the transporting layer occurred more effectively in perovskites with higher orientation diversity than in highly oriented perovskites, resulting in higher efficiencies. The relationship between the orientation diversity of perovskites and their power conversion efficiency was investigated. Our work will be beneficial for the development of high-efficiency solar cell devices.