期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 2, 页码 2558-2565出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17773
关键词
4-fluorophenethylammonium iodide; surface passivation; decreased defects; nonradiative recombination; high efficiency; perovskite solar cells
资金
- National Key Research and Development Project from the Ministry of Science and Technology of China [2016YFA0202400, 2016YFA0202404]
- National Natural Science Foundation of China [61604058, 62004089]
- Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370, JCYJ20190809150811504, JCYJ20180302174026262]
- Guangdong Basic and Applied Basic Research Foundation [2019B1515120083, 2019A1515110439]
- Shenzhen Engineering Research and Development Center for Flexible Solar Cells Project from Shenzhen Development and Reform Committee [2019-126]
Passivating the perovskite layer with organic halide salts directly can reduce film defects and enhance charge transport efficiency, leading to improved device performance and stability. The strategy effectively suppresses nonradiative recombination and reduces recombination losses, resulting in higher device efficiency and good ambient stability.
Passivating the defective surface of perovskite films is becoming a particularly effective approach to further boost the efficiency and stability of their solar cells. Organic ammonium halide salts are extensively utilized as passivation agents in the form of their corresponding 2D perovskites to construct the 2D/3D perovskite bilayer architecture for superior device performance; however, this bilayer device partly suffers from the postannealing-induced destructiveness to the 3D perovskite bulk and charge transport barrier induced by the quantum confinement existing in the 2D perovskite. Hence, developing direct passivation of the perovskite layer by organic ammonium halides for high-performance devices can well address the above-mentioned issues, which has rarely been explored. Herein, an effective passivation strategy is proposed to directly modify the perovskite surface with an organic halide salt 4-fluorophenethylammonium iodide (F-PEAI) without further postannealing. The F-PEAL passivation largely inhibits the formation of the iodine vacancies and thus dramatically reduces the film defects, resulting in a much slower charge trapping process. Consequently, the F-PEAL-modified device achieves a much higher champion efficiency (21%) than that (19.5%) of the control device, which dominantly results from more efficient suppression of interfacial nonradiative recombination and the subsequent decreased recombination losses. Additionally, the F-PEAL-treated device maintains 90% of its initial efficiency after 720 h of humidity aging owing to the enhanced hydrophobicity and decreased trap states, highlighting good ambient stability. These results provide an effective passivation strategy toward efficient and stable perovskite solar cells.
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