Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Crystallinity Control Effects on Vanadium Oxide Films for Enhanced Electrochromic Performances

전기변색 성능 향상을 위한 바나듐산화물 막의 결정성 제어 효과

  • Kim, Kue-Ho (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Bae, Ju-Won (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Lee, Tae-Kuen (Department of Materials Science and Engineering, 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) ;
  • 배주원 (서울과학기술대학교 신소재공학과) ;
  • 이태근 (서울과학기술대학교 신소재공학과) ;
  • 안효진 (서울과학기술대학교 신소재공학과)
  • Received : 2019.05.10
  • Accepted : 2019.06.18
  • Published : 2019.06.27
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Abstract

In the present study, vanadium oxide($V_2O_5$) films for electrochromic(EC) application are fabricated using sol-gel spin coating method. In order to optimize the EC performance of the $V_2O_5$ films, we adjust the amounts of polyvinylpyrrolidone(PVP) added to the solution at 0, 5, 10, and 15 wt%. Due to the effect of added PVP on the $V_2O_5$ films, the obtained films show increases of film thickness and crystallinity. Compared to other samples, optimum weight percent(10 wt%) of PVP led to superior EC performance with transmittance modulation(45.43 %), responding speeds(6.0 s at colored state and 6.2 s at bleached state), and coloration efficiency($29.8cm^2/C$). This performance improvement can be mainly attributed to the enhanced electrical conductivity and electrochemical activity due to the increased crystallinity and thickness of the $V_2O_5$ films. Therefore, $V_2O_5$ films fabricated with optimized amount of PVP can be a promising EC material for high-performance EC devices.

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References

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