A Spacer Cation Assisted Nucleation and Growth Strategy Enables Efficient and High‐Luminance Quasi‐2D Perovskite LEDs

Kong, Lingmei; Luo, Yaning; Turyanska, Lyudmila; Zhang, Ting; Zhang, Zhipeng; Xing, Guichuan; Yang, Yingguo; Zhang, Chengxi; Yang, Xuyong

Abstract

Quasi‐2D Ruddlesden‐Popper perovskites receive tremendous attention for application in light‐emitting diodes (LEDs). However, the role of organic ammonium spacers on perovskite film has not been fully‐understood. Herein, a spacer cation assisted perovskite nucleation and growth strategy, where guanidinium (GA+) spacer is introduced into the perovskite precursor and at the interface between the hole transport layer (HTL) and the perovskite, to achieve dense and uniform perovskite films with enhanced optical and electrical performance is developed. A thin GABr interface pre‐formed on HTL provides more nucleation sites for perovskite crystal; while the added GA+ in perovskite reduces the crystallization rate due to strong hydrogen bonding interacts with intermediates, which promotes the growth of enhanced‐quality quasi‐2D perovskite films. The ionized ammonium group ( NH3+) of GA+ also favors formation of polydisperse domain distribution, and amine or imine ( NH2 or NH) group interact with perovskite defects through coordination bonding. The spacer cation assisted nucleation and growth strategy is advantageous for producing efficient and high‐luminance perovskite LEDs, with a peak external quantum efficiency of over 20% and a luminance up to 100 000 cd m−2. This work can inform and underpin future development of high‐performance perovskite LEDs with concurrent high efficiency and brightness.

Citation

Kong, L., Luo, Y., Turyanska, L., Zhang, T., Zhang, Z., Xing, G., …Yang, X. (2022). A Spacer Cation Assisted Nucleation and Growth Strategy Enables Efficient and High‐Luminance Quasi‐2D Perovskite LEDs. Advanced Functional Materials, Article 2209186. https://doi.org/10.1002/adfm.202209186

• Journal Article Type: Article
• Acceptance Date: Oct 17, 2022
• Online Publication Date: Nov 4, 2022
• Publication Date: Nov 4, 2022
• Deposit Date: Nov 15, 2022
• Publicly Available Date: Nov 17, 2022
• Journal: Advanced Functional Materials
• Print ISSN: 1616-301X
• Electronic ISSN: 1616-3028
• Peer Reviewed: Peer Reviewed
• Article Number: 2209186
• DOI: https://doi.org/10.1002/adfm.202209186
• Keywords: Research Article, Research Articles, guanidinium, high luminance, hydrogen bonding, light‐emitting diodes, quasi‐2D perovskites
• Public URL: https://nottingham-repository.worktribe.com/output/13448931
• Publisher URL: https://onlinelibrary.wiley.com/doi/10.1002/adfm.202209186