Crystallization regulation and protection of quasi-2D perovskite film by copolymer to enhance the stability of perovskite light-emitting diodes

被引：6
作者：
Dong, Jie [1 ,2 ]
Wang, Wei [1 ,2 ]
Li, Yueqiao [1 ,2 ]
Huang, Xiaofeng [1 ,2 ]
Lu, Yao [1 ,2 ]
Qiao, Bo [1 ,2 ]
Zhao, Suling [1 ,2 ]
Song, Dandan [1 ,2 ]
Xu, Zheng [1 ,2 ]
机构：
[1] Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China
[2] Beijing Jiaotong Univ, Inst Optoelect Technol, Beijing 100044, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2022年 / 10卷 / 31期
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
DEGRADATION; NANOCRYSTALS; POLYMER; LAYER;
D O I：
10.1039/d2tc01412b
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Despite the high efficiency achieved at present, perovskite light-emitting diodes (PeLEDs) still suffer from poor device stability, even in quasi-two-dimensional (quasi-2D) perovskites with high stability potential. In this work, we propose using a copolymer, ethylene vinyl acetate (EVA), as an additive in anti-solvent to enhance the device stability of the PeLEDs. EVA regulates the crystallization process, which suppresses the phase change-induced material degradation to some extent. Moreover, the hydrophobic feature of EVA allows it to protect the perovskite layer against moisture and further increases the device stability. In addition, the ester group of EVA passivates the trap states in the perovskites. As a result, the EVA-modified PeLEDs show notably enhanced device stability (T80 of 80 min at relative humidity >45%) and device efficiency (22.9 cd A(-1)) compared with the standard PeLEDs (47 min and 17.4 cd A(-1), respectively).
引用
收藏
页码：11258 / 11265
页数：8
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