光伏
钙钛矿(结构)
材料科学
纳米技术
光电子学
串联
图层(电子)
钙钛矿太阳能电池
离子
光伏系统
能量转换效率
结晶学
化学
复合材料
生态学
有机化学
生物
作者
Xingtao Wang,Chi Zhang,Tiantian Liu,Shuo Qin,Zizhen Lin,Congbo Shi,Dongming Zhao,Zhiguo Zhao,Xiaojun Qin,Menglei Li,Yong Wang
出处
期刊:Small
[Wiley]
日期:2024-02-29
标识
DOI:10.1002/smll.202311673
摘要
Inverted perovskite solar cells (PSCs) are considered as the most promising avenue for the commercialization of PSCs due to their potential inherent stability. However, suboptimal interface contacts between electron transport layer (ETL) (such as C60 ) and the perovskite absorbing layer within inverted PSCs always result in reduced efficiency and poor stability. Herein, a surface state manipulation strategy has been developed by employing a highly electronegative 4-fluorophenethylamine hydrochloride (p-F-PEACl) to effectively address the issue of poor interface contacts in the inverted PSCs. The p-F-PEACl demonstrates a robust interaction with perovskite film through bonding of amino group and Cl- with I- and Pb2+ ions in the perovskite, respectively. As such, the surface defects of perovskite film can be significantly reduced, leading to suppressed non-radiative recombination. Moreover, p-F-PEACl also plays a dual role in enhancing the surface potential and improving energy-level alignment at the interfaces between the perovskite and C60 carrier transport layer, which directly contributes to efficient charge extraction. Finally, the open-circuit voltage (Voc ) of devices increases from 1.104 V to 1.157 V, leading to an overall efficiency improvement from 22.34% to 24.78%. Furthermore, the p-F-PEACl-treated PSCs also display excellent stability.
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