Affordable Access

deepdyve-link
Publisher Website

Novel Lewis Base Cyclam Self-Passivation of Perovskites without an Anti-Solvent Process for Efficient Light-Emitting Diodes.

Authors
  • Han, Boning1, 2
  • Yuan, Shichen1, 2
  • Fang, Tao1, 2
  • Zhang, Fengjuan1, 2
  • Shi, Zhifeng3
  • Song, Jizhong1, 2
  • 1 School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. , (China)
  • 2 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, Nanjing 210094, China. , (China)
  • 3 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China. , (China)
Type
Published Article
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society
Publication Date
Mar 25, 2020
Volume
12
Issue
12
Pages
14224–14232
Identifiers
DOI: 10.1021/acsami.0c02768
PMID: 32129073
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Metal halide perovskites have been focused as a candidate applied as a promising luminescent material for next-generation high-quality lighting and high-definition display. However, as perovskite films formed, high density of defects would be produced in solution processing inevitably, leading to low exciton recombination efficiency in light-emitting diodes (LEDs). Herein, a facile and novel self-passivation strategy to inhibit defect formation in perovskite films for constructing high-performance LEDs is developed. For the first time, we introduce 1,4,8,11-tetraazacyclotetradecane (cyclam) in perovskite precursor solution, and it spontaneously passivates defect states of CsPbBr3-based perovskites by coaction between amine and uncoordinated lead ions during spin-coating without an anti-solvent process. Furthermore, as a delocalized system, cyclam also possesses chemical properties that facilitate exciton transportation. The proposed passivation strategy boosts the external quantum efficiency from 1.25% (control device) to 16.24% (cyclam-passivated device). Furthermore, defect passivation is also conductive to reduce LED degradation paths and improve device stability as the extrapolated lifetime (T50) of LEDs at an initial brightness of 100 cd/m2 is increased from 0.9 to 127 h. These findings indicate that the introduction of cyclam is highly effective to enhance the performance of LEDs, and such a strategy in effectively reducing the defects could be also applied in other perovskite-based devices, such as lasers, solar cells, and photodetectors.

Report this publication

Statistics

Seen <100 times