Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Enhanced Electrochromic Performance by Uniform Surface Morphology of Tungsten Oxide Films

텅스텐산화물 막의 균일한 표면 형상에 의한 향상된 전기변색 성능

  • Kim, Kue-Ho (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Koo, Bon-Ryul (Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology) ;
  • Ahn, Hyo-Jin (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 김규호 (서울과학기술대학교 신소재공학과) ;
  • 구본율 (서울과학기술대학교 의공학-바이오소재 융합 협동과정 신소재공학프로그램) ;
  • 안효진 (서울과학기술대학교 신소재공학과)
  • Received : 2018.06.05
  • Accepted : 2018.06.21
  • Published : 2018.07.27
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Abstract

Tungsten oxide($WO_3$) films with uniform surface morphology are fabricated using a spin-coating method for applications of electrochromic(EC) devices. To improve the EC performances of the $WO_3$ films, we control the heating rate of the annealing process to 10, 5, and $1^{\circ}C/min$. Compared to the other samples, the $WO_3$ films fabricated at a heating rate of $5^{\circ}C/min$ shows superior EC performances for transmittance modulation(49.5 %), response speeds(8.3 s in a colored state and 11.2 s in a bleached state), and coloration efficiency($37.3cm^2/C$). This performance improvement is mainly related to formation of a uniform surface morphology with increased particle size without any cracks by an optimized annealing heating rate, which improves the electrical conductivity and electrochemical activity of the $WO_3$ films. Thus, the $WO_3$ films with a uniform surface morphology prepared by the optimized annealing heating rate can be used as a potential candidate for performance improvement of the EC devices.

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References

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