Amine-Based Passivating Materials for Enhanced Optical Properties and Performance of Organic-Inorganic Perovskites in Light-Emitting Diodes

Seungjin Lee, Jong Hyun Park, Bo Ram Lee, Eui Dae Jung, Jae Choul Yu, Daniele Di Nuzzo, Richard H. Friend, Myoung Hoon Song

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106 Citations (Scopus)

Abstract

The use of hybrid organic-inorganic perovskites in optoelectronic applications are attracting an interest because of their outstanding characteristics, which enable a remarkable enhancement of device efficiency. However, solution-processed perovskite crystals unavoidably contain defect sites that cause hysteresis in perovskite solar cells (PeSCs) and blinking in perovskite light-emitting diodes (PeLEDs). Here, we report significant beneficial effects using a new treatment based on amine-based passivating materials (APMs) to passivate the defect sites of methylammonium lead tribromide (MAPbBr3) through coordinate bonding between the nitrogen atoms and undercoordinated lead ions. This treatment greatly enhanced the PeLED's efficiency, with an external quantum efficiency (EQE) of 6.2%, enhanced photoluminescence (PL), a lower threshold for amplified spontaneous emission (ASE), a longer PL lifetime, and enhanced device stability. Using confocal microscopy, we observed the cessation of PL blinking in perovskite films treated with ethylenediamine (EDA) due to passivation of the defect sites in the MAPbBr3.

Original languageEnglish
Pages (from-to)1784-1792
Number of pages9
JournalJournal of Physical Chemistry Letters
Volume8
Issue number8
DOIs
Publication statusPublished - 20 Apr 2017
Externally publishedYes

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