Flexible electrochromic films based on CVD-graphene electrodes

Title
Flexible electrochromic films based on CVD-graphene electrodes
Authors
Dong Soo ChoiSeung Ho HanHyeongkeun KimSo Hee KangYena Kim양철민Tae Young KimDae Ho YoonWoo Seok Yang
Keywords
CVD; Graphene; Electrochromic; Flexible Devices; WOx; NiO
Issue Date
2014-10
Publisher
Nanotechnology
Citation
VOL 25, NO 39, 395702-1-395702-7
Abstract
Graphene synthesized via chemical vapor deposition is a notable candidate for flexible large-area transparent electrodes due to its great physical properties and its 2D activated surface area. Electrochromic devices in optical displays, smart windows, etc are suitable applications for graphene when used as a transparent conductive electrode. In this study, various-layer graphene was synthesized via chemical vapor deposition, and inorganic WOx was deposited on the layers, which have advantageous columnar structures and W6+ and W4+ oxidation states. The characteristics of graphene and WOx were verified using optical transmittance, Raman spectroscopy, x-ray photoelectron spectroscopy and scanning electron microscopy. The optimum transparent conductive electrode condition for controlling graphene layers was investigated based on the optical density and cyclic voltammetry. Electrochromic devices were fabricated using a three-layer graphene electrode, which had the best optical density. The graphene in the flexible electrochromic device demonstrated a potential for replacing ITO in flexible electronics.
URI
http://pubs.kist.re.kr/handle/201004/48119
ISSN
09574484
Appears in Collections:
KIST Publication > Article
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