Synergistic passivation and stepped-dimensional perovskite analogs enable high-efficiency near-infrared light-emitting diodes

Yongjie Liu, Chen Tao, Yu Cao, Liangyan Chen, Shuxin Wang, Pei Li, Cheng Wang, Chenwei Liu, Feihong Ye, Shengyong Hu, Meng Xiao, Zheng Gao, Pengbing Gui, Fang Yao, Kailian Dong, Jiashuai Li, Xuzhi Hu, Hengjiang Cong, Shuangfeng Jia, Ti WangJianbo Wang, Gang Li, Wei Huang, Weijun Ke, Jianpu Wang, Guojia Fang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)

Abstract

Formamidinium lead iodide (FAPbI3) perovskites are promising emitters for near-infrared light-emitting diodes. However, their performance is still limited by defect-assisted nonradiative recombination and band offset-induced carrier aggregation at the interface. Herein, we introduce a couple of cadmium salts with acetate or halide anion into the FAPbI3 perovskite precursors to synergistically passivate the material defects and optimize the device band structure. Particularly, the perovskite analogs, containing zero-dimensional formamidinium cadmium iodide, one-dimensional δ-FAPbI3, two-dimensional FA2FAn-1PbnI3n+1, and three-dimensional α-FAPbI3, can be obtained in one pot and play a pivotal and positive role in energy transfer in the formamidinium iodide-rich lead-based perovskite films. As a result, the near-infrared FAPbI3-based devices deliver a maximum external quantum efficiency of 24.1% together with substantially improved operational stability. Combining our findings on defect passivation and energy transfer, we also achieve near-infrared light communication with device twins of light emitting and unprecedented self-driven detection.

Original languageEnglish
Article number7425
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - Dec 2022

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General
  • General Physics and Astronomy

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