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Title: Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
Authors: Wang, Lin
Liu, Baiquan
Zhao, Xin
Demir, Hilmi Volkan
Gu, Haoshuang
Sun, Handong
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Wang, L., Liu, B., Zhao, X., Demir, H. V., Gu, H., & Sun, H. (2018). Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes. ACS Applied Materials and Interfaces, 10(23),19828–19835. doi:10.1021/acsami.8b06105
Project: MOE2016-T2-1-054
Tier 1-RG105/16
Tier 1-RG92/15
NRF-CRP14-2014- 03
152 73 00025
Journal: ACS Applied Materials and Interfaces
Abstract: All-inorganic cesium halide perovskite nanocrystals have attracted much interest in optoelectronic applications for the sake of the readily adjustable band gaps, high photoluminescence quantum yield, pure color emission, and affordable cost. However, because of the ineluctable utilization of organic surfactants during the synthesis, the structural and optical properties of CsPbBr3 nanocrystals degrade upon transforming from colloidal solutions to solid thin films, which plagues the device operation. Here, we develop a novel solvent-assisted surface engineering strategy, producing high-quality CsPbBr3 thin films for device applications. A good solvent is first introduced as an assembly trigger to conduct assembly in a one-dimensional direction, which is then interrupted by adding a nonsolvent. The nonsolvent drives the adjacent nanoparticles connecting in a two-dimensional direction. Assembled CsPbBr3 nanocrystal thin films are densely packed and very smooth with a surface roughness of ∼4.8 nm, which is highly desirable for carrier transport in a light-emitting diode (LED) device. Meanwhile, the film stability is apparently improved. Benefiting from this facile and reliable strategy, we have achieved remarkably improved performance of CsPbBr3 nanocrystal-based LEDs. Our results not only enrich the methods of nanocrystal surface engineering but also shed light on developing high-performance LEDs.
ISSN: 1944-8244
DOI: 10.1021/acsami.8b06105
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays
Centre for Disruptive Photonic Technologies
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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