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Fabrication of an Automatic Color-Tuned System with Flexibility Using a Dry Deposited Photoanode

  • Dahyun Choi
  • Yoonchan Park
  • Minji Lee
  • Kwangmin Kim
  • Jung-Oh Choi
  • Caroline Sunyong Lee
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Abstract

A self-powered electrochromic device was fabricated on an indium tin oxide-polyethylene naphthalate flexible substrate using a dyesensitized solar cell (DSSC) as a self-harvesting source; the electrochromic device was naturally bleached and operated under outdoor light conditions. The color of the organic electrochromic polymer, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, was shifted from pale blue to deep blue with an antimony tin oxide film as a charge-balanced material. Electrochromic performance was enhanced by secondary doping using dimethyl sulfoxide. As a result, the device showed stable switching behavior with a high transmittance change difference of 40% at its specific wavelength of 630 nm for 6 hrs. To improve the efficiency of the solar cell, 1.0 wt.% of Ag NWs in the photoanode was applied to the TiO2 photoanode. It resulted in an efficiency of 3.3%, leading to an operating voltage of 0.7 V under xenon lamp conditions. As a result, we built a standalone self-harvesting electrochromic system with the performance of transmittance switching of 29% at 630 nm, by connecting with two solar cells in a device. Thus, a self-harvesting and flexible device was fabricated to operate automatically under the irradiated/dark conditions.

Keywords

Self-harvesting Electrochromic device Dye-sensitized solar cell Dry deposition system 

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Copyright information

© Korean Society for Precision Engineering 2018

Authors and Affiliations

  1. 1.Department of Materials EngineeringHanyang UniversityGyeonggi-doRepublic of Korea
  2. 2.School of Mechanical & Aerospace EngineeringSeoul National UniversitySeoulRepublic of Korea

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