Impact of Amine Additives on Perovskite Precursor Aging: A Case Study of Light-Emitting Diodes.

ABSTRACT: Amines are widely employed as additives for improving the performance of metal halide perovskite optoelectronic devices. However, amines are well-known for their high chemical reactivity, the impact of which has yet to receive enough attention from the perovskite light-emitting diode community. Here, by investigating an unusual positive aging effect of CH₃NH₃I/CsI/PbI₂ precursor solutions as an example, we reveal that amines gradually undergo N-formylation in perovskite precursors over time. This reaction is initialized by hydrolysis of dimethylformamide in the acidic chemical environment. Further investigations suggest that the reaction products collectively impact perovskite crystallization and eventually lead to significantly enhanced external quantum ef

SUBMITTER: Xu Y 

PROVIDER: S-EPMC8256416 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature