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2018 Vol.28, Issue 7 Preview Page
Enhanced Electrochromic Performance by Uniform Surface Morphology of Tungsten Oxide Films

텅스텐산화물 막의 균일한 표면 형상에 의한 향상된 전기변색 성능

Kue-Ho Kim 1
,
Bon-Ryul Koo2
,
Hyo-Jin Ahn 12†
김 규호 1
,
구 본율 2
,
안 효진 12†
1Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
2Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
1서울과학기술대학교 신소재공학과
2서울과학기술대학교 의공학-바이오소재 융합 협동과정 신소재공학프로그램
†Corresponding author E-Mail : hjahn@seoultech.ac.kr (H.-J. Ahn, Seoul Nat'l Univ. Sci. and Technol.)
July 2018. pp. 411-416
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Abstract

Tungsten oxide(WO3) 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 WO3 films, we control the heating rate of the annealing process to 10, 5, and 1 °C/min. Compared to the other samples, the WO3 films fabricated at a heating rate of 5 °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(37.3 cm2/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 WO3 films. Thus, the WO3 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.

Keywords
electrochromic performance
annealing heating rate
tungsten oxide
film structure
spin-coating
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 28
  • No :7
  • Pages :411-416
  • Received Date : 2018-06-05
  • Revised Date : 2018-06-21
  • Accepted Date : 2018-06-21
  • DOI :https://doi.org/10.3740/MRSK.2018.28.7.411
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