Enhancing the Performance of Perovskite Light-Emitting Diodes via Synergistic Effect of Defect Passivation and Dielectric Screening

Yu，Xuanchi1,2; Guo，Jia1; Mao，Yulin1; Shan，Chengwei2; Tian，Fengshou2; Meng，Bingheng2; Wang，Zhaojin2; Zhang，Tianqi1; Kyaw，Aung Ko Ko2; Chen，Shuming2; Sun，Xiaowei2; Wang，Kai2; Chen，Rui2; Xing，Guichuan1

2024-12-01

10.1007/s40820-024-01405-5

Nano-Micro Letters   影响因子和分区

2311-6706

2150-5551

Metal halide perovskites, particularly the quasi-two-dimensional perovskite subclass, have exhibited considerable potential for next-generation electroluminescent materials for lighting and display. Nevertheless, the presence of defects within these perovskites has a substantial influence on the emission efficiency and durability of the devices. In this study, we revealed a synergistic passivation mechanism on perovskite films by using a dual-functional compound of potassium bromide. The dual functional potassium bromide on the one hand can passivate the defects of halide vacancies with bromine anions and, on the other hand, can screen the charged defects at the grain boundaries with potassium cations. This approach effectively reduces the probability of carriers quenching resulting from charged defects capture and consequently enhances the radiative recombination efficiency of perovskite thin films, leading to a significant enhancement of photoluminescence quantum yield to near-unity values (95%). Meanwhile, the potassium bromide treatment promoted the growth of homogeneous and smooth film, facilitating the charge carrier injection in the devices. Consequently, the perovskite light-emitting diodes based on this strategy achieve a maximum external quantum efficiency of ~ 21% and maximum luminance of ~ 60,000 cd m. This work provides a deeper insight into the passivation mechanism of ionic compound additives in perovskite with the solution method. (Figure presented.)

Defects passivation Dielectric screening Perovskite light-emitting diodes Synergistic passivation strategy

SCI

英语

其他

2-s2.0-85194734868

Scopus

1.Institute of Applied Physics and Materials Engineering,University of Macau,Taipa,Avenida da Universidade,999078,Macao
2.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Yu，Xuanchi,Guo，Jia,Mao，Yulin,et al. Enhancing the Performance of Perovskite Light-Emitting Diodes via Synergistic Effect of Defect Passivation and Dielectric Screening[J]. Nano-Micro Letters,2024,16(1).

Yu，Xuanchi.,Guo，Jia.,Mao，Yulin.,Shan，Chengwei.,Tian，Fengshou.,...&Xing，Guichuan.(2024).Enhancing the Performance of Perovskite Light-Emitting Diodes via Synergistic Effect of Defect Passivation and Dielectric Screening.Nano-Micro Letters,16(1).

Yu，Xuanchi,et al."Enhancing the Performance of Perovskite Light-Emitting Diodes via Synergistic Effect of Defect Passivation and Dielectric Screening".Nano-Micro Letters 16.1(2024).