Phase‐Transition‐Cycle‐Induced Recrystallization of FAPbI3 Film in An Open Environment Toward Excellent Photodetectors with High Reproducibility. Issue 34 (17th October 2022)

• Record Type: Journal Article
• Authors: Wang, Meng; Cao, Fengren; Meng, Linxing; Wang, Min; Li, Liang
• Is Part Of: Advanced science. Volume 9:Issue 34(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-17
• Subjects: perovskites -- phase transition cycle -- photodetectors -- recrystallization -- reproducibility; Science -- Periodicals; 505
• DOI: 10.1002/advs.202204386
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Perovskite is an attractive building block for future optoelectronic applications. However, the strict fabrication conditions of perovskite devices impede the transformation of lab techniques into commercial applications. Here, a facile annealing‐free posttreatment is proposed to reconstruct the perovskite film to obtain high‐performance photodetectors with an optimized production rate. With posttreatment by methylamine thiocyanate, the prefabricated formamidinium‐lead triiodide (FAPbI3 ) film will undergo a recrystallization process consisting of a repeating phase‐transition‐cycle (PTC) between the black and yellow phases of FAPbI3, which improves the crystal quality and eliminates defects. As a result, some casually prepared or even decomposed perovskite films can be reconstructed, and the dispersion degree of the device performance based on the posttreatment method decreases by ≈21% compared to the traditional antisolvent method. This facile and annealing‐free posttreatment will be an attractive method for the future industrial production of perovskite devices. Abstract : A novel recrystallization process is employed to optimize the fabricating process of formamidinium‐lead triiodide (FAPbI3 ) film. With a facile posttreatment by methylamine thiocyanate, FAPbI3 crystal will proceed a repeating phase transition cycle, which improves its crystallization and stability. Meanwhile, the film reproducibility is significantly improved by 21% in the standard deviation.