title: Flexible electrochromic films based on CVD-graphene electrodes.
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 WO(x) was deposited on the layers, which have advantageous columnar structures and W(6+) and W(4+) oxidation states. The characteristics of graphene and WO(x) 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.
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea. Electronic Materials and Device Research Center, Korea Electronics Technology Institute, Seongnam 463-816, Republic of Korea.
authors.forename: Dong
authors.initials: D
authors.lastname: Soo Choi
authors.forename: Seung
authors.initials: S
authors.lastname: Ho Han
authors.forename: Hyeongkeun
authors.initials: H
authors.lastname: Kim
authors.forename: So
authors.initials: S
authors.lastname: Hee Kang
authors.forename: Yena
authors.initials: Y
authors.lastname: Kim
authors.forename: Cheol-Min
authors.initials: CM
authors.lastname: Yang
authors.forename: Tae Young
authors.initials: TY
authors.lastname: Kim
authors.forename: Dae
authors.initials: D
authors.lastname: Ho Yoon
authors.forename: Woo
authors.initials: W
authors.lastname: Seok Yang