Trivalent‐Neodymium Additive Modulated MAPbBr3 Perovskite Nucleation and Growth: Ultrawide Processing Window for One‐Step Fabrication of Efficient Light‐Emitting Perovskites

• Published in: Advanced electronic materials Vol. 6; no. 3
• Main Authors: Dong, Yurong, Zeng, Pan, Yu, Yan, Xie, Yujun, Yang, Bilin, Liang, Rongqing, Ou, Qiongrong, Zhang, Shuyu
• Format: Journal Article
• Language: English
• Published: 01.03.2020
• Subjects: lanthanide incorporation; light‐emitting thin films; perovskite; processing window
• ISSN: 2199-160X; 2199-160X
• DOI: 10.1002/aelm.201901162

Hybrid metal halide perovskite–based light‐emitting diodes and lasers have demonstrated outstanding performance and currently lead a new trend in the optoelectronic field; however, the widely used one‐step spin‐coating method assisted by an antisolvent suffers from the narrow processing window of antisolvents, which limits its further use in commercial applications. The present work incorporates trivalent‐neodymium ions (Nd3+) into methylammonium lead tribromide (MAPbBr3) perovskite thin films to control nucleation and crystal growth, achieving an ultrabroad processing window of 18 s, significantly larger than the conventional processing window of 3–5 s. A sixfold enhanced photoluminescence quantum yield (PLQY) and an excellent stability of at least 8 months in ambient conditions is also demonstrated. The results provide a deeper understanding of the nucleation and growth process of ion‐incorporated perovskites and demonstrate an effective strategy to overcome the narrow processing window limit. By incorporating Nd3+ into MAPbBr3 perovskite thin films, nucleation and crystal growth is modulated, leading to a significantly broadened processing window for antisolvent dripping. The Nd3+‐containing films exhibit high stability with enhanced photoluminescence quantum yields and phase purity due to induced heterogeneous nucleation. This strategy can be combined with various current approaches that mostly work in the subsequent growth stage.