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김희제(Hee-Je Kim),이정기(Jeong-Gee Lee),이경준(Kyung-Jun Lee),프라바카르(Prabakar),신동설(Dong-Seoul Sin),채원용(Won-Yong Chae) 대한전기학회 2010 전기학회논문지 Vol.59 No.1
The shadowing effects lead to the serious power losses of the PV module. The shadowing effects are caused by several factors such as leafs, dust, antenna and clouds. The dye-sensitized solar cells are more economical than the conventional silicon solar cell that's why the dye-sensitized solar cells are recently focused on. We carried out research on the efficiency of the dye-sensitized solar cell depending on the level of shadow changing the formula of the circuit. The research on the efficiency of the large dye-sensitized solar cell depending on the level of shadow focused on commercialization was carried out. As the results, it is known that the series and parallel connection method is the best choice for the least losses of PV module assemblies. It is especially known that one more series connection is the best choice for the least losses about shadowing effects and current losses in the series and parallel connection.
TiO₂ 두께에 따른 염료감응형 태양전지의 전기화학적 임피던스 분석
김희제(Hee-Je Kim),이정기(Jeong-Gee Lee),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),김진경(Jin-Kyoung Kim),프라바카르(K. Prabakar),신인영(Inyoung Shin) 대한전기학회 2009 전기학회논문지 Vol.58 No.12
Dye-sensitized solar cell(DSC) is composed of a dye-adsorbed nanoporous TiO₂ layer on fluorine-doped tin oxide(FTO) glass substrate, electrolyte, and platinium doped counter electrode. Among these, a dye-absorbed nanoporous TiO₂ layer plays an important role in the performance of the DSC because the injected electrons from excited dye molecules move through this layer. And the condition of TiO₂ layer such as the morphology and thickness affects on the electron movement. Therefore, the performances and the efficiency of DSC change as the thickness of TiO₂ layer is different. Electrochemical Impedance Spectroscopy(EIS) is the powerful analysis method to study the kinetics of electrochemical and photoelectrochemical processes occurring in the DSC especially the injected electron movements. So we analyzed the DSCs with different TiO₂ thicknesses by using EIS to understand the influence of the TiO₂ thickness to the performance of the DSC clearly. Finally, we got the EIS analysis on the DSC with different TiO₂ thickness from the internal resistance of the DSC, the electron life time and the amount of dye molecules.
티타늄이 증착된 유리를 사용한 FTO-less 염료감응형 태양전지에 관한 연구
박송이(Songyi Park),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),김수경(Soo-Kyoung Kim),홍나영(Na-Yeong Hong),송정윤(Jeong-Yun Song),프라바카르(Kandasamy Prabakar),김희제(Hee-Je Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.2
Dye-sensitized solar cells (DSCs) have taken much attention due to their low cost and easy fabrication method compare to silicon solar cells. But research on cost effective DSC is prerequisite for commercialization. Fluorine doped tin oxide (FTO) which have been commonly used for electrode substrate as electron collector occupied most percentage of manufacturing cost. Therefore we studied FTO-less DSC using sputtered Ti deposited glass as photoelectrode instead of FTO to reduce manufacturing cost. Ti films sputtered on the glass for different time, 5 to 20 minutes with decreasing sheet resistance as deposition time increases. A light source illuminated to counter electrode in order to overcome opaque Ti films. The efficiency of DSC (Ti20) made Ti sputtered glass for 20 min as photoelectrode was 5.87%. There are no significant difference with conventional cell despite lower manufacturing cost.
Zinc nitrate 용액을 이용한 염료감응형 태양전지 반사 방지막에 관한 연구
최진호(Jinho Choi),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),김수경(Soo-Kyoung Kim),김병만(Byung-Man Kim),김희제(Hee-Je Kim),프라바카르(Kandasamy Prabakar),김종락(Jong-Rak Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.5
An anti-reflection layer (AR) is used in the solar cell to improve the amount of the irradiated light, resulting in the improvement of the performance of the solar cell. In this study, the zinc oxide (ZnO) AR is applied to the dye-sensitized solar cell (DSC) by using zinc nitrate solution. The conditions such as solution concentration and sintering temperature for fabricating the ZnO AR are changed to optimize the performance of the AR. As a result, the best performance is shown when the zinc nitrate solution with 100mM concentration is used and the sintering temperature is 600℃. And then, the ZnO AR formed with these optimal conditions is applied to the DSC. Consequently, a DSC with a ZnO AR had an increased current density up to 13.86㎃/㎠ and an enhanced efficiency of 6.32%.
Blocking layer 제작에 따른 염료감응형 태양전지 출력특성 및 내부 임피던스 분석
김진경(Jin-Kyoung Kim),손민규(Min-Kyu Son),김수경(Soo-Kyoung Kim),홍나영(Na Yeong Hong),김병만(Byung-Man Kim),프라바카르(KANDASAMY PRABAKAR),김희제(Hee-Je Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.1
DSCs are based on a dye-adsorbed porous TiO2 layer as a photo electrode [1]. Under the illumination, dye molecules are excited and electrons are produced. The injected electrons in the conduction band of TiO2 may recombine with the electrolyte. To obtain high performance DSCs, it is essential to retard the recombination. The charge recombination can be reduced by forming core-shell structure. In this work, we investigated the core-shell structure with Al2O3 and MgO coating layer on the porous TiO2 layer. We confirmed the photovoltaic properties by I-V characteristics. The current and the efficiency was improved. In addition to, Through decrease in the width of EIS arc, which is the sum of the interfacial charge transfer resistances of both electrodes, we can be indicated that the block effect.