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Anion-exchange assisted sequential deposition for stable and efficient FAPbI3-based perovskite solar cells.
- Source :
-
Chemical Engineering Journal . Jan2023:Part 2, Vol. 452, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- • A single-crystal complex FA 4 Pb 3 I 6 Ac 4 is synthesized. • FAPbI 3 perovskite film has been fabricated from FA 4 Pb 3 I 6 Ac 4 via anion-exchange. • The FAPbI 3 film is dense and uniform with low trap-state density. • The PSC shows a PCE of 23.65% with enhanced stability. PbI 2 as precursor has been extensively employed for the fabrication of organic–inorganic hybrid perovskite films for high-efficiency perovskite solar cells (PSCs) by using two-step solution deposition method. However, the resultant perovskite film suffers from the incomplete reaction of PbI 2 and the volumetric expansion of the film, affecting both the performance and stability of the PSCs. Here, a single-crystal complex FA 4 Pb 3 I 6 Ac 4 (Ac−: CH 3 COO−) is synthesized, and utilized to replace PbI 2 for the fabrication of FAPbI 3 -based perovskite film in ambient conditions. The solution-processed crystal complex has good film-forming ability, and can be directly converted into stable black-phase FAPbI 3 perovskite at room temperature through anion exchange reaction between Ac− and I− upon coating with iodide salt solution. By the strategy, a dense and uniform perovskite film is obtained with reduced trap-state density and prolonged charge lifetime. The champion device delivers a power conversion efficiency (PCE) of 23.65% with high reproductivity. Importantly, the unencapsulated device exhibits a dramatically improved operational stability under temperature and humidity conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SOLAR cells
*PEROVSKITE
*SOLUTION (Chemistry)
*EXCHANGE reactions
Subjects
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 452
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 159710137
- Full Text :
- https://doi.org/10.1016/j.cej.2022.139326