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Development of Ultra-Thin TiO2 Coated WO3 Inverse Opal Photoelectrode for Dye-Sensitized Solar Cells

염료감응형 태양전지로의 응용을 위한 얇은 TiO2가 코팅 된 WO3 역오팔 광전극의 개발

  • Arunachalam, Maheswari (Department of Chemistry, Chonnam National University) ;
  • Kwag, Seoui (Gwangju Science Academy For the Gifted) ;
  • Lee, Inho (Gwangju Science Academy For the Gifted) ;
  • Kim, Chung Soo (Testing Analysis Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sang-Kwon (Department of Chemistry Education, Chonnam National University) ;
  • Kang, Soon Hyung (Department of Chemistry Education, Chonnam National University)
  • ;
  • 곽서의 (과학영재학교 광주과학고등학교) ;
  • 이인호 (과학영재학교 광주과학고등학교) ;
  • 김청수 (한국세라믹기술원 시험분석센터) ;
  • 이상권 (전남대학교 화학교육과) ;
  • 강순형 (전남대학교 화학교육과)
  • Received : 2019.07.10
  • Accepted : 2019.07.29
  • Published : 2019.08.27

Abstract

In this study, we prepare pure $WO_3$ inverse opal(IO) film with a thickness of approximately $3{\mu}m$ by electrodeposition, and an ultra-thin $TiO_2$ layer having a thickness of 2 nm is deposited on $WO_3$ IO film by atomic layer deposition. Both sets of photoelectrochemical properties are evaluated after developing dye-sensitized solar cells(DSSCs). In addition, morphological, crystalline and optical properties of the developed films are evaluated through field-emission scanning electron microscopy(FE-SEM), High-resolution transmission electron microscopy(HR-TEM), X-ray diffraction(XRD) and UV/visible/infrared spectrophotometry. In particular, pure $WO_3$ IO based DSSCs show low $V_{OC}$, $J_{SC}$ and fill factor of 0.25 V, $0.89mA/cm^2$ and 18.9 %, achieving an efficiency of 0.04 %, whereas the $TiO_2/WO_3$ IO based DSSCs exhibit $V_{OC}$, $J_{SC}$ and fill factor of 0.57 V, $1.18mA/cm^2$ and 50.1 %, revealing an overall conversion efficiency of 0.34 %, probably attributable to the high dye adsorption and suppressed charge recombination reaction.

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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