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All‐Solution Processed Multicolor Patterning Technique of Perovskite Nanocrystal for Color Pixel Array and Flexible Optoelectronic Devices
Author(s) -
Jeon Sanghyun,
Lee Sang Yeop,
Kim SuKyung,
Kim Woosik,
Park Taesung,
Bang Junsung,
Ahn Junhyuk,
Woo Ho Kun,
Chae JiYeon,
Paik Taejong,
Seong TaeYeon,
Oh Soong Ju
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000501
Subject(s) - materials science , nanocrystal , perovskite (structure) , photolithography , optoelectronics , gamut , nanotechnology , color gel , layer (electronics) , optics , chemical engineering , physics , engineering , thin film transistor
In the present study, a new patterning method is introduced through the surface modification and stabilization of perovskite nanocrystals, which is compatible with conventional photolithography process based on all‐solution processes. Chemically designed gel‐type silica‐coated CsPbX 3 (X = Br, I, etc.) perovskite nanocrystals combined with dip coating method are introduced to form stable and uniform films. Analyses of the physical and chemical states of nanocrystals and investigation of the kinetics in silica formation are conducted. In an optimized condition, physically uniform and chemically stable perovskite thin films are deposited on various substrates such as flexible, stretchable substrates, or even nonflat objects. By adopting these advantages and developing stable photolithographic chemicals, the high resolution patterns are successfully patterned with green and red emitting CsPbBr 3 and CsPbBr 3 I 3− x perovskites with the size down to 5 µm of radius and even a multicolor pixel array which can be used for the color filter, light converting or detecting applications. Flexible white light emitting diode is also fabricated with a large color gamut coverage. This work provides a fundamental understanding of perovskite nanocrystals, and also offers a technological breakthrough enabling various optoelectronic applications.