Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes

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...

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Main Authors: Wang, Lin, Liu, Baiquan, Zhao, Xin, Demir, Hilmi Volkan, Gu, Haoshuang, Sun, Handong
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143496
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spelling sg-ntu-dr.10356-1434962023-02-28T19:49:36Z Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes Wang, Lin Liu, Baiquan Zhao, Xin Demir, Hilmi Volkan Gu, Haoshuang Sun, Handong School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays Centre for Disruptive Photonic Technologies Engineering::Electrical and electronic engineering Solvent Engineering Self-assembly 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. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) Accepted version This work was supported by the Singapore Ministry of Education through the Academic Research Fund under Projects MOE2016-T2-1-054, Tier 1-RG105/16 and Tier 1-RG92/15 and China Scholarship Council (20163100, no. 201608420137). Thanks to the support of the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research program (NRF-CRP14-2014- 03), its Investigatorship program (NRF-NRFI2016-08) and the Singapore Agency for Science, Technology and Research (A*STAR) SERC Pharos Program under grant no. 152 73 00025. H.V.D. gratefully acknowledges TUBA-GEBIP. 2020-09-04T07:59:04Z 2020-09-04T07:59:04Z 2018 Journal Article 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 1944-8244 https://hdl.handle.net/10356/143496 10.1021/acsami.8b06105 29775046 2-s2.0-85047419144 23 10 19828 19835 en MOE2016-T2-1-054 Tier 1-RG105/16 Tier 1-RG92/15 NRF-CRP14-2014- 03 NRF-NRFI2016-08 152 73 00025 ACS Applied Materials and Interfaces 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 https://doi.org/10.1021/acsami.8b06105 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Solvent Engineering
Self-assembly
spellingShingle Engineering::Electrical and electronic engineering
Solvent Engineering
Self-assembly
Wang, Lin
Liu, Baiquan
Zhao, Xin
Demir, Hilmi Volkan
Gu, Haoshuang
Sun, Handong
Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
description 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.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Wang, Lin
Liu, Baiquan
Zhao, Xin
Demir, Hilmi Volkan
Gu, Haoshuang
Sun, Handong
format Article
author Wang, Lin
Liu, Baiquan
Zhao, Xin
Demir, Hilmi Volkan
Gu, Haoshuang
Sun, Handong
author_sort Wang, Lin
title Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
title_short Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
title_full Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
title_fullStr Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
title_full_unstemmed Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
title_sort solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes
publishDate 2020
url https://hdl.handle.net/10356/143496
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