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Visualizing the Surface Photocurrent Distribution in Perovskite Photovoltaics
Small ( IF 13.0 ) Pub Date : 2022-06-20 , DOI: 10.1002/smll.202201930 Jing Chen 1 , Guang-Peng Zhu 1 , Xiang Li 1 , Yan-Hui Lou 2 , Chong Dong 1 , Kai-Li Wang 1 , Shuai Yuan 1 , Chun-Hao Chen 1 , Yi-Ran Shi 1 , Tao Wang 1 , Zhao-Kui Wang 1
Small ( IF 13.0 ) Pub Date : 2022-06-20 , DOI: 10.1002/smll.202201930 Jing Chen 1 , Guang-Peng Zhu 1 , Xiang Li 1 , Yan-Hui Lou 2 , Chong Dong 1 , Kai-Li Wang 1 , Shuai Yuan 1 , Chun-Hao Chen 1 , Yi-Ran Shi 1 , Tao Wang 1 , Zhao-Kui Wang 1
Affiliation
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Defect states play an important role in the photovoltaic performance of metal halide perovskites. Particularly, the passivation of surface defects has made great contributions to high-performance perovskite photovoltaics. This highlights the importance of understanding the surface defects from a fundamental level by developing more accurate and operando characterization techniques. Herein, a strategy to enable the surface carriers and photocurrent distributions on perovskite films to be visualized in the horizontal direction is put forward. The visual image of photocurrent distribution is realized by combining the static local distribution of carriers provided by scanning near-field optical microscopy with the dynamic transporting of carriers achieved via a scanning photocurrent measurement system. Taking a surface passivated molecule as an example, a comprehensive defect scene including static and dynamic as well as local and entire conditions is obtained using this strategy. The comprehensive analysis of the trap states in perovskite films is pioneered vertically and horizontally, which will powerfully promote the deep understanding of defect mechanisms and carrier behavior for the goal of fabricating high-performance perovskite optoelectronic devices.
中文翻译：
可视化钙钛矿光伏中的表面光电流分布
缺陷态在金属卤化物钙钛矿的光伏性能中起着重要作用。特别是表面缺陷的钝化对高性能钙钛矿光伏发电做出了巨大贡献。这突出了通过开发更准确和操作表征技术从基础层面了解表面缺陷的重要性。在此，提出了一种使钙钛矿薄膜上的表面载流子和光电流分布在水平方向上可视化的策略。通过扫描近场光学显微镜提供的载流子的静态局部分布与通过扫描光电流测量系统实现的载流子的动态传输相结合，实现了光电流分布的可视化图像。以表面钝化分子为例，使用该策略获得包括静态和动态以及局部和整体条件的综合缺陷场景。纵向和横向对钙钛矿薄膜中陷阱态的综合分析，将有力地促进对缺陷机制和载流子行为的深入理解，以实现制造高性能钙钛矿光电器件的目标。
更新日期：2022-06-20
中文翻译：
可视化钙钛矿光伏中的表面光电流分布
缺陷态在金属卤化物钙钛矿的光伏性能中起着重要作用。特别是表面缺陷的钝化对高性能钙钛矿光伏发电做出了巨大贡献。这突出了通过开发更准确和操作表征技术从基础层面了解表面缺陷的重要性。在此，提出了一种使钙钛矿薄膜上的表面载流子和光电流分布在水平方向上可视化的策略。通过扫描近场光学显微镜提供的载流子的静态局部分布与通过扫描光电流测量系统实现的载流子的动态传输相结合，实现了光电流分布的可视化图像。以表面钝化分子为例，使用该策略获得包括静态和动态以及局部和整体条件的综合缺陷场景。纵向和横向对钙钛矿薄膜中陷阱态的综合分析，将有力地促进对缺陷机制和载流子行为的深入理解，以实现制造高性能钙钛矿光电器件的目标。
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