Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Ferroelectric BiFeO3-coated TiO2 Electrodes for Enhanced Photovoltaic Properties of Dye-sensitized Solar Cells

강유전체 BiFeO3가 증착된 TiO2 전극을 이용한 염료감응형 태양전지의 효율 향상

  • Joo, Ho-Yong (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Hong, Su Bong (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Lee, Hosang (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Jeon, Ji Hoon (Department of Physics, Konkuk University) ;
  • Park, Bae Ho (Department of Physics, Konkuk University) ;
  • Hong, Sung Chul (Department of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Choi, Taekjib (Department of Nanotechnology and Advanced Materials Engineering, Sejong University)
  • 주호용 (세종대학교 나노신소재공학과) ;
  • 홍수봉 (세종대학교 나노신소재공학과) ;
  • 이호상 (세종대학교 나노신소재공학과) ;
  • 전지훈 (건국대학교 물리학과) ;
  • 박배호 (건국대학교 물리학과) ;
  • 홍성철 (세종대학교 나노신소재공학과) ;
  • 최택집 (세종대학교 나노신소재공학과)
  • Received : 2013.01.23
  • Accepted : 2013.02.12
  • Published : 2013.03.01
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Abstract

Dye-sensitized solar cells (DSSCs) based on titanium dioxide ($TiO_2$) have been extensively studied because of their promising low-cost alternatives to conventional semiconductor based solar cells. DSSCs consist of molecular dye at the interface between a liquid electrolyte and a mesoporous wide-bandgap semiconductor oxide. Most efforts for high conversion efficiencies have focused on dye and liquid electrolytes. However, interface engineering between dye and electrode is also important to reduce recombination and improve efficiency. In this work, for interface engineering, we deposited semiconducting ferroelectric $BiFeO_3$ with bandgap of 2.8 eV on $TiO_2$ nanoparticles and nanotubes. Photovoltaic properties of DSSCs were characterized as a function of thickness of $BiFeO_3$. We showed that ferroelectric $BiFeO_3$-coated $TiO_2$ electrodes enable to increase overall efficiency of DSSCs, which was associated with efficient electron transport due to internal electric field originating from electric polarization. It was suggested that engineering the dye-$TiO_2$ interface using ferroelectric materials as inorganic modifiers can be key parameter for enhanced photovoltaic performance of the cell.

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