钙钛矿(结构)
光伏系统
简单(哲学)
材料科学
桥(图论)
接口(物质)
光电子学
化学物理
化学
复合材料
结晶学
工程类
电气工程
医学
哲学
认识论
毛细管数
毛细管作用
内科学
作者
Xinghang Cao,Yuhao Kang,Defeng Zhuang,Yuting Xu,Yingyu Wang,Guang-Hong Yang,He Huang,Lanlan Zhai,Yun Yang,Lijie Zhang,Chao Zou
出处
期刊:Langmuir
[American Chemical Society]
日期:2024-02-16
标识
DOI:10.1021/acs.langmuir.3c03350
摘要
NiOx-based two-dimensional perovskite solar cells (2D-PSCs) have the advantages of low fabrication temperature, suitable energy level matching, suppressed hysteresis, and superior stability, while the poor interfacial contacts between NiOx and perovskite layers limit the perovskite film growth and charge transfer. Herein, a simple molecule, urea, was used as a molecular modifier to form bifacial passivation on the buried interface of NiOx/perovskite, resulting in better interfacial contact and efficient bifacial passivation. We demonstrated that efficient bifacial passivation mainly comes from strong interactions between urea and NiOx or perovskite, which make urea a molecular bridge for smoother charge transfer. Moreover, urea can regulate the ratio of Ni3+/Ni2+, therefore boosting the conductivity of NiOx, and adjust the morphology of the NiOx film for better 2D-perovskite crystal growth. Besides, urea also passivates the bifacial defect states of both NiOx and perovskite film, yielding reduced defect density of the perovskite film and superior charge transfer on the buried interface. Consequently, inverted 2D-PSCs with urea modification proved significant improvements in short-circuit current density and fill factor, resulting in improved power conversion efficiency from 14.64 to 16.84% with better stability in air.
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