Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Development of ZnS/SiO2 Double Overlayers for the Enhanced Photovoltaic Properties of Quantum Dot-Sensitized Solar Cells

양자점 감응 태양전지의 광전 특성 향상을 위한 ZnS/SiO2 이중 오버레이어 개발

  • SONG, INCHEUL (Department of Chemical Engineering, Dankook University) ;
  • JUNG, SUNG-MOK (Department of Chemical Engineering, Dankook University) ;
  • SEO, JOO-WON (Department of Chemical Engineering, Dankook University) ;
  • KIM, JAE-YUP (Department of Chemical Engineering, Dankook University)
  • 송인철 (단국대학교 화학공학과) ;
  • 정성목 (단국대학교 화학공학과) ;
  • 서주원 (단국대학교 화학공학과) ;
  • 김재엽 (단국대학교 화학공학과)
  • Received : 2021.11.25
  • Accepted : 2021.12.16
  • Published : 2021.12.30
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Abstract

For the high efficiencies of quantum dot-sensitized solar cells (QDSCs), it is important to control the severe electron recombination at the interface of photoanode/electrolyte. In this work, we optimize the surface passivation process of ZnS/SiO2 double overlayers for the enhanced photovoltaic performances of QDSCs. The overlayers of zinc sulfide (ZnS) and SiO2 are coated on the surface of QD-sensitized photoanode by successive ionic layer adsorption and reaction (SILAR) method, and sol-gel reaction, respectively. In particular, for the sol-gel reaction of SiO2, the influences of temperature of precursor solution are investigated. By application of SiO2 overlayers on the ZnS-coated photoanode, the conversion efficiency of QDSCs is increased from 5.04% to 7.35%. The impedance analysis reveals that the electron recombination at the interface of photoanode/electrolyte is obviously reduced by the SiO2 overlayers.

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References

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