Voltage-Tunable Dual Image of Electrostatic Force-Assisted Dispensing Printed, Tungsten Trioxide-Based Electrochromic Devices with a Symmetric Configuration

Xinlin Li, Tae Yong Yun, Keon Woo Kim, Se Hyun Kim, Hong Chul Moon

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Electrostatic force-assisted dispensing (EFAD)-printed tungsten trioxide (WO3)-based electrochromic devices (ECDs) displaying a dual image depending on the applied voltage are demonstrated. We first print WO3 via EFAD printing, in which the width of the printed lines can be tuned by adjusting the printing speed. The performance of the ECDs is characterized while varying the thickness of the printed WO3 film. It is determined that ∼550 nm thick WO3 is the optimal film considering maximum transmittance contrast (ΔTmax), device dynamic responses, efficiency, and long-term coloration/bleaching cyclic stability. More significantly, the coloration of the devices in this work can alternatively appear due to the use of electrolyte-soluble anodic species (here, dimethyl ferrocene, dmFc), for which WO3 films should be deposited on both electrodes and a part of the electrodes should be exposed to the electrolyte for the oxidation of dmFc. To take advantage of such features of the devices, we successfully demonstrate EFAD-printed, flexible WO3 ECDs alternately displaying a dual image, which is expected to have high potential as a functional component of printed electronics.

Original languageEnglish
Pages (from-to)4022-4030
Number of pages9
JournalACS applied materials & interfaces
Volume12
Issue number3
DOIs
StatePublished - 22 Jan 2020

Keywords

  • electrochromism
  • electrostatic force-assisted dispensing printing
  • printed electronics
  • symmetric device configuration
  • voltage-tunable dual image

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