Probing the Photovoltage and Photocurrent in Perovskite Solar Cells with Nanoscale Resolution
Probing the Photovoltage and Photocurrent in Perovskite Solar Cells with Nanoscale Resolution
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以纳米级分辨率探测钙钛矿太阳能电池中的光电压和光电流
DOI：
10.1002/adfm.201504451
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发表时间：
2016
影响因子：
19
通讯作者：
Cao Guozhong
中科院分区：
文献类型：
--
作者：
Zhao Zhenxuan;Chen Xiangyu;Wu Huaqiang;Wu Xiaoming;Cao Guozhong
通过扫描开尔文探针力显微镜（SKPM）和光导原子力显微镜（pcAFM）的耦合，研究了具有不同薄膜形貌的钙钛矿太阳能电池（PSCs）的表面电位、光致电压和光电流网络的变化。利用SKPM技术首次研究了三种不同钙钛矿晶体尺寸的不同钙钛矿封盖层的纳米级光伏反应。整个器件的性能与钙钛矿薄膜的局部纳米结构有关。并给出了不同外加电压下的光电流图。pcAFM在三个不同形态位置上的测量结果表明，封盖层上的缺陷区域可以诱导完整PSCs中的电荷重组过程，从而抑制完整器件中的Voc。这些结果表明，通过更好地控制形态，psc的性能仍然可以得到改善。因此，SKPM结合pcAFM技术有可能成为钙钛矿有机和混合光伏的常规表征工具。
In this work, by coupling scanning Kelvin probe force microscopy (SKPM) and photoconductive atomic force microscopy (pcAFM), the variation of the surface potential, photogenerated voltage, and photocurrent networks of the perovskite solar cells (PSCs) with different film topography is studied. The nanoscale photovoltaic reaction of different perovskite capping layers with three different perovskite crystalline sizes is first studied by using the SKPM technique. The performance of the overall device is correlated with the local nanostructure of the perovskite film. Photocurrent maps under various applied voltages are also presented. The pcAFM measurements on three different morphology positions determine that the defect region on the capping layer can induce the charge recombination process in the complete PSCs and thus suppress the Voc in the complete device. These results suggest that the performance of PSCs can still be improved through better control of morphology. Henceforth, SKPM coupled with pcAFM techniques has the potential to become a routine characterization tool for perovskite organic and hybrid photovoltaics.