Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 26, Pages 29344-29356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06558
Keywords
CsFAMA perovskite; thermal annealing; J-V hysteresis; ion migration; PL behavior; perovskite solar cells
Funding
- National Natural Science Foundation of China [51403005]
- Sichuan Science and Technology Program [2018JY0015]
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Cesium (Cs) contained triple-cation and mixed halide perovskite (CsFAMA) is broadly employed as light absorption layers for efficient and stable perovskite solar cells (PSCs) fabrication with high reproducibility. On the other hand, thermal annealing is a universal post-treatment method for perovskite films preparation. Moreover, thermal management highly depends on perovskite materials. However, no specialized study has been reported on CsFAMA perovskite to date. Herein, we have systematically investigated the influence of thermal annealing and annealing time on CsFAMA films and their solar cells. We demonstrated that heating time of 45 or 60 min at 100 degrees C is desirable. More interestingly, we found that the unannealed CsFAMA films exhibit ultrahigh photoluminescence (PL) intensities, much stronger than that of annealed films. Note that PL intensities gradually weaken as a function of annealing time. In particular, the PL intensities of fresh films (after antisolvent dripping) are at least 200 times higher than that of 60 min annealed films. To our knowledge, it is the first time to report this PL behavior. We speculate that it is due to quantum confinement effect of perovskite crystal nuclei and cage effect of DMSO intermediates in the fresh films. To this point, the unannealed CsFAMA films may have great potential in PL emission applications.
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