期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 20, 页码 22870-22878出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c21035
关键词
perovskite solar cells; ionic liquid solvent; molecular interaction; morphology; defect density
资金
- Natural Science Foundation of China [62004167, 61705102, 91833304]
- Department of Science & Technology of Shaanxi Province [2020GXLH-Z-018]
- Northwestern Polytechnical University [2020GXLH-Z-018]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JM-326]
- Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars, China [BK20200034]
- Fundamental Research Funds for the Central Universities
Ionic liquids (ILs) show promise as green solvents for the production of efficient and stable perovskite solar cells (PSCs). However, the limited research on IL solvents and their molecular structures' influence on perovskite film crystallization and device performance is not fully understood.
As a green solvent, ionic liquids (ILs) are considered as a promising alternative to conventional polar aprotic solvents for the production of efficient and stable perovskite solar cells (PSCs). Moreover, with the use of IL solvents, perovskite films can be prepared without antisolvent treatments in an ambient environment instead of in a glovebox with inert gases, which simplifies the film manufacturing process and is favorable for industrialization production. However, the type of IL solvents that have been studied is limited, and the influence of IL molecular structures on the perovskite-film crystallization and device performance is not completely understood. In this work, four different ILs, methylammonium formate (MAF), methylammonium acetate (MAAc), methylammonium propionate (MAP), and mthylammonium isobutyrate (MAIB), are synthesized as the perovskite precursor solvents. The interaction between the functional groups of the synthesized solvents and Pb2+ in the precursor solution is studied, which has a direct impact on the morphology and crystallization of the deposited perovskite film. It is found that MAP solvent gives a high-quality perovskite film, which leads to the best photovoltaic performance with a champion PCE of 20.56% compared to the devices based on the other IL solvents. Moreover, the MAP-based device maintains 88% of its original PCE after 1000 h of storage in a N-2 atmosphere, demonstrating excellent device stability. Therefore, it is concluded that MAP is the most suitable solvent for MAPbI(3) films with respect to photovoltaic applications as compared to the other ILs.
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