期刊
CHEMSUSCHEM
卷 14, 期 20, 页码 4415-4421出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202101475
关键词
antisolvent effects; azetidinium; perovskites; solar cells; tin
资金
- Taiwan Ministry of Science and Technology [MOST 110-2123-M-A49-001, MOST 110-2634F-009-026]
- Center for Emergent Functional Matter Science of National Yang Ming Chiao Tung University (NYCU) from The Featured Areas Research Center Program by Taiwan Ministry of Education (MOE)
Introducing the new organic cation AZ into the crystal structure of tin-based perovskites forms mixed-cation perovskites, which exhibit improved stability and performance for solar cells. By using a specific antisolvent, smooth and uniform perovskite films can be fabricated to optimize device efficiency, showing promising potential for commercialization.
Overcoming the issue of the stability of tin-based perovskites is a major challenge for the commercial development of lead-free perovskite solar cells. To attack this problem, a new organic cation, azetidinium (AZ), is incorporated into the crystal structure of formamidinium tin triiodide (FASnI(3)) to form the mixed-cation perovskite AZ(x)FA(1-x)SnI(3). As AZ has a similar size to FA but a larger dipole moment, hybrid AZ(x)FA(1-x)SnI(3) films exhibit variation in optical and electronic properties on increasing the proportion of AZ. Trifluoromethylbenzene (CF3C6H5) serves as antisolvent to fabricate smooth and uniform perovskite films for the devices with an inverted planar heterojunction structure. The device performance is optimized to produce the greatest efficiency at x=0.15 (AZ15), for which a power conversion efficiency of 9.6 % is obtained when the unencapsulated AZ15 device is stored in air for 100 h. Moreover, the device retains 90 % of its initial efficiency for over 15 days. The significant performance and stability of this device reveal that the concept of mixed cations is a promising approach to stabilize tin-based perovskite solar cells for future commercialization.
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