Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Effect of Particle Size and Structure of TiO2 Semiconductor on Photoelectronic Efficiency of Dye-sensitized Solar Cell

TiO2 나노 입자의 크기와 결정 구조가 염료감응형 태양전지의 광전 효율에 미치는 영향

  • Lee, Hyeonju (Department of Chemistry, Yeungnam University) ;
  • Park, No-Kuk (School of Chemical Engineering, Yeungnam University) ;
  • Lee, Tae Jin (School of Chemical Engineering, Yeungnam University) ;
  • Han, Gi Bo (Plant Engineering Division, Institute for Advanced Engineering) ;
  • Kang, Misook (Department of Chemistry, Yeungnam University)
  • Received : 2012.11.16
  • Accepted : 2012.12.05
  • Published : 2013.03.31
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Abstract

A comparison of photo-efficiency on dye-sensitized solar cells (DSCs) assembled by using $TiO_2$ materials with different structures and crystallite sizes were investigated in this study. The size and structure of $TiO_2$ have been controlled by pHs and calcination temperatures using solvothermal and sol-gel methods, respectively. Six types of $TiO_2$ samples are obtained; 8.9, 12.8, and 20.2 nm sized $TiO_2$ particles, and the other types using sol-gel method were anatase-rutile mixtures on the structure. The highest photo-efficiency which is remarkable result reached to 8.6% over DSC assembled by anatase $TiO_2$ with 20.2 nm particle size.

본 연구는 염료감응형 태양전지의 구성요소 중 핵심 소재로 주목받고 있는 티타니아($TiO_2$) 나노입자의 크기와 결정구조에 따른 광전 효율을 비교하고자 하였다. 나노입자의 크기는 용매열법(solvothermal method)을 이용하여 출발 용액의 pH를 조절하고 결정구조의 차이는 솔-젤법에 의해 얻어진 무정형의 티타니아를 온도를 달리하여 소성함으로써 조절되었다. 그 결과, 용매법으로는 8.9, 12.8 그리고 20.2 nm의 크기를 가지는 세 종류의 아나타제 티타니아를, 솔-젤법으로는 세 종류의 아나타제-루타일(anatase-rutile) 혼합결정구조를 가지는 티타니아를 얻었다. 여섯 종류의 샘플 중 20.2 nm 크기의 아나타제 결정구조의 티타니아를 광 전극으로 사용한 염료감응형 태양전지 단위 셀에서 8.6%로 가장 좋은 광전 효율을 얻었다.

Keywords

References

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