光电流
钙钛矿(结构)
晶界
材料科学
表面光电压
光电导性
微晶
图层(电子)
光电子学
光伏系统
半导体
太阳能电池
纳米技术
结晶学
化学
复合材料
微观结构
生态学
物理
量子力学
光谱学
冶金
生物
作者
Wenlong Yao,Shuyan Fang,Ziyang Hu,Like Huang,Xiaohui Liu,Houcheng Zhang,Jing Zhang,Yuejin Zhu
出处
期刊:Small
[Wiley]
日期:2021-12-11
卷期号:18 (8)
被引量:11
标识
DOI:10.1002/smll.202105140
摘要
In polycrystalline perovskites, grain boundaries (GBs) that isolate grains determine the optoelectronic properties of a semiconductor, and hence affect the photovoltaic performance of a solar cell. Photocurrent and photovoltage are affected by the microscopic structure of perovskites but are difficult to quantify on the intragrain length scale and are often treated as homogeneous within the photoactive layer. Here, the nanoscale through-film and lateral photoresponse of large-grained perovskite are studied by photoconductive atomic force microscopy. Photocurrent collection along GBs relies on the formation of adjacent grains, exhibiting GB to GB heterogeneity. Regarding to the spatially correlated heterogeneity, the photovoltage of grains deduced from the photoresponse curves at specific positions is larger than that of GBs by up to 0.4 V, suggesting that the photovoltage loss mainly originates from the shunting of GBs through the whole perovskite layer. These spatial heterogeneities are alleviated by depositing a capping layer onto the perovskite layer, highlighting the role of the inserted layer between the perovskite and electrode in real solar cells. This research reveals the heterogeneity of GBs and its influence on photovoltage that actually occurs in virtual solar cells, which is crucial for optimizing perovskite-based solar cells.
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