材料科学
钙钛矿(结构)
带隙
钝化
光电子学
开路电压
结晶度
掺杂剂
兴奋剂
三碘化物
太阳能电池
光伏系统
能量转换效率
低压
异质结
电气工程
纳米技术
化学工程
电压
化学
物理化学
电极
图层(电子)
色素敏化染料
工程类
电解质
复合材料
作者
Nabin Ghimire,Raja Sekhar Bobba,Ashim Gurung,Khan Mamun Reza,Ashiqur Rahman Laskar,Buddhi Sagar Lamsal,Khalid Emshadi,Rajesh Pathak,Mohammad Adil Afroz,Ashraful Haider Chowdhury,Ke Chen,Behzad Bahrami,Sheikh Ifatur Rahman,Jyotshna Pokharel,Abiral Baniya,Tawabur Rahman,Yue Zhou,Qiquan Qiao
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-02-01
卷期号:4 (2): 1731-1742
被引量:17
标识
DOI:10.1021/acsaem.0c02895
摘要
Lead (Pb)–Tin (Sn) mixed perovskites suffer from large open-circuit voltage (Voc) loss due to the rapid crystallization of perovskite films, creating Sn and Pb vacancies. Such vacancies act as defect sites expediting charge carrier recombination, thus hampering the charge carrier dynamics and optoelectronic properties of the perovskite film. Here, we report the passivation of these defects using a controlled amount of 2-phenylethylazanium iodide (PEAI) in perovskite precursor solution as a dopant to enhance the performance of the 1.25 eV Pb–Sn low-bandgap perovskite solar cell. It was found that the incorporation of PEAI in the perovskite precursor not only improves the perovskite film quality and crystallinity but also lowers the electronic disorder, thereby enhancing the open-circuit voltage up to 0.85 V, corresponding to Voc loss as low as 0.4 V and the power conversion efficiency up to 17.33%. The value of Voc loss obtained with this strategy is among the least obtained for similar band gap Pb–Sn low-bandgap perovskite solar cells. Furthermore, the ambient and dark self-stability of the PEAI-treated devices were also enhanced. This work presents a simple doping strategy to mitigate the Voc loss of Pb–Sn mixed low-bandgap perovskite solar cells.
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