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염료감응형 태양전지로의 응용을 위한 얇은 TiO2가 코팅 된 WO3 역오팔 광전극의 개발
Maheswari Arunachalam,곽서의,이인호,김청수,강순형,이상권 한국재료학회 2019 한국재료학회지 Vol.29 No.8
In this study, we prepare pure WO3 inverse opal(IO) film with a thickness of approximately 3 μm by electrodeposition, and an ultra-thin TiO2 layer having a thickness of 2 nm is deposited on WO3 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 WO3 IO based DSSCs show low VOC, JSC and fill factor of 0.25 V, 0.89 mA/cm2 and 18.9 %, achieving an efficiency of 0.04 %, whereas the TiO2/WO3 IO based DSSCs exhibit VOC, JSC and fill factor of 0.57 V, 1.18 mA/cm2 and 50.1 %, revealing an overall conversion efficiency of 0.34 %, probably attributable to the high dye adsorption and suppressed charge recombination reaction.
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WO3 역오팔 구조의 TiO2 코팅 유무에 따른 염료 감응형 태양전지의 특성 비교
강순형(Kang, Soon Hyung),고지우(Koh, Jiwoo),곽서의(Kwag, Seoui),변혜진(Byeun, Hyejin),이인호(Lee, Inho) 한국과학영재교육학회 2019 과학영재교육 Vol.11 No.1
This study is based on Research and Education (R&E) project in science high school. In this study, we compared the photoelectrochemical properties of pure WO3 and TiO2 coated WO3 inverse opal film after the development of dye-sensitized solar cells (DSSCs). That is, above the SnO2 inverse opal (IO), thin WO3 film was prepared by the facile electrodeposition, subsequently forming the TiO2 layer by dipping in the 0.05 M or 0.005 M TiCl4 solution. Their morphological, crystalline, optical and photoelectrochemical properties of the developed films and composed DSSCs were evaluated exploring the field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), UV-visible spectrophotometer and solar simulator. In particular, the fill factor of pure WO3 coated SnO2 IO, 0.005 M TiCl4 treated WO3/SnO2 IO and 0.05 M TiCl4 treated WO3/SnO2 IO existed in the similar value of approximately 32%. On the other hand, the TiO2 coated samples exhibit the more enhanced absorption and photocurrent, compared to that of pure WO3/SnO2 IO, resulting in the high conversion efficiency. This points out that the proper coating of TiO2 layer on the WO3 photoelectrode can induce to the high dye adsorption as well as the suppressed charge recombination, granting the possibility of the challenging photoelectrode.
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