磁滞
工作职能
钙钛矿(结构)
材料科学
光电子学
能量转换效率
平面的
纳米技术
凝聚态物理
化学
计算机科学
结晶学
物理
计算机图形学(图像)
图层(电子)
作者
Zenghua Wang,Bing Cai,Deyu Xin,Min Zhang,Xiaofeng Zheng
标识
DOI:10.1016/j.jechem.2023.05.031
摘要
Commercialization of perovskite solar cells (PSCs) requires the development of high-efficiency devices with none current density-voltage (J-V) hysteresis. Here, electron transport layers (ETLs) with gradual change in work function (WF) are successfully fabricated and employed as an ideal model to investigate the energy barriers, charge transfer and recombination kinetics at ETL/perovskite interface. The energy barrier for electron injection existing at ETL/perovskite is directly assessed by surface photovoltage microscopy, and the results demonstrate the tunable barriers have significant impact on the J-V hysteresis and performance of PSCs. By work function engineering of ETL, PSCs exhibit PCEs over 21% with negligible hysteresis. These results provide a critical understanding of the origin reason for hysteresis effect in planar PSCs, and clear reveal that the J-V hysteresis can be effectively suppressed by carefully tuning the interface features in PSCs. By extending this strategy to a modified formamidinium-cesium-rubidium (FA-Cs-Rb) perovskite system, the PCEs are further boosted to 24.18%. Moreover, 5 cm × 5 cm perovskite mini-modules are also fabricated with an impressive efficiency of 20.07%, demonstrating compatibility and effectiveness of our strategy on upscaled devices.
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