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Color of Copper/Copper Oxide

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Title
Color of Copper/Copper Oxide
Author(s)
Kim, Su Jae; Kim, Seonghoon; Lee, Jegon; Jo, Yongjae; Seo, Yu-Seong; Lee, Myounghoon; Lee, Yousil; Cho, Chae Ryong; Kim, Jong-pil; Cheon, Miyeon; Hwang, Jungseek; Yong In Kim; Young-Hoon Kim; Young-Min Kim; Soon, Aloysius; Choi, Myunghwan; Choi, Woo Seok; Se-Young Jeong; Young Hee Lee
Publication Date
2021-03
Journal
Advanced Materials, v.33, no.15
Publisher
John Wiley and Sons Inc
Abstract
© 2021 The Authors. Advanced Materials published by Wiley-VCH GmbHStochastic inhomogeneous oxidation is an inherent characteristic of copper (Cu), often hindering color tuning and bandgap engineering of oxides. Coherent control of the interface between metal and metal oxide remains unresolved. Coherent propagation of an oxidation front in single-crystal Cu thin film is demonstrated to achieve a full-color spectrum for Cu by precisely controlling its oxide-layer thickness. Grain-boundary-free and atomically flat films prepared by atomic-sputtering epitaxy allow tailoring of the oxide layer with an abrupt interface via heat treatment with a suppressed temperature gradient. Color tuning of nearly full-color red/green/blue indices is realized by precise control of the oxide-layer thickness; the samples cover ≈50.4% of the standard red/green/blue color space. The color of copper/copper oxide is realized by the reconstruction of the quantitative yield color from the oxide “pigment” (complex dielectric functions of Cu2O) and light-layer interference (reflectance spectra obtained from the Fresnel equations) to produce structural color. Furthermore, laser-oxide lithography is demonstrated with micrometer-scale linewidth and depth through local phase transformation to oxides embedded in the metal, providing spacing necessary for semiconducting transport and optoelectronics functionality.
URI
https://pr.ibs.re.kr/handle/8788114/9508
DOI
10.1002/adma.202007345
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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