Journal
ADVANCED MATERIALS
Volume 34, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202108569
Keywords
alkylamines; perovskites; phase transition; photodetectors
Categories
Funding
- National Natural Science Foundation of China [52025028, 52002258]
- Natural Science Foundation of Jiangsu Province [BK20200877]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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This study reports a new method to obtain highly crystalline perovskite films by adding ethylamine iodide and proposes a novel working mechanism for alkyl amine additives in the perovskite crystallization process. The results indicate that the additive affects the solid-state transition process from the intermediate phase to the final phase.
Perovskite has been widely applied in the optoelectronic field due to its strong light absorption and high carrier mobility. Maintaining high crystallization is critical to fabricate high-performance perovskite devices, where many methods have been reported, such as the use of additives in precursor solutions. However, there are few reports for the working mechanism of these additives. Herein, a new method to obtain highly crystalline formamidinium-lead triiodide (FAPbI(3)) perovskite films by introducing ethylamine iodide (EAI) into perovskite precursors is reported and a novel working mechanism for such alkyl amine additives in the crystallization process of perovskites is proposed. Unlike traditional liquid-to-solid (L-S) crystallization theory, the research results indicate that EAI affects the solid-to-solid (S-S) transition process from the intermediate yellow phase to the final black phase, and this mechanism is further verified to be universal using other common alkyl amines. A self-powered photodetector based on an as-fabricated FAPbI(3) film is fabricated with an external quantum efficiency of over 90%. This work provides a deeper understanding of the perovskite crystallization process.
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