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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.
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),김수경(Soo-Kyoung Kim),홍나영(Na-Yeong Hong),김병만(Byung-Man Kim),박송이(Songyi Park),김희제(Hee-Je Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.11
In this study, the ZnO nanorod is grown on the seed layered glass substrate by applying an external electric field to fabricate the ZnO nanorod with the high quality and to increase the yield of the ZnO nanorod. It is possible to grow the definite and clear hexagonal ZnO nanorod as the cathode of the high voltage is connected to the side of the seed layered glass substrate and the anode is connected to the opposite side because more Zn<SUP>2+</SUP> ions are located around the ZnO seed layer and are accumulated easily due to the external electric field. As a result, it is succeeded to fabricate the definite hexagonal ZnO nanorod having better structural characteristics by applying the external electric field during the growth process. Therefore, it is demonstrated that the external electric field is effective to fabricate the high quality ZnO nanorod without changing any composition of the ZnO nanorod.
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.
Nb₂O<SUB>5</SUB>-TiO₂ 화합물을 이용한 염료감응형 태양전지의 성능 향상
최석원(Seok-Won Choi),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),김수경(Soo-Kyoung Kim),홍나영(Na-Yeong Hong),김희제(Hee-Je Kim),김종락(Jong-Rak Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.8
Niobium oxide (Nb₂O5) has a strong chemical coherence and good electrical conductivity. Therefore, this material is helpful to enhance the performance of the dye sensitized solar cells (DSC) by improving the electron mobility. In this study, Nb₂O5 was mixed with TiO₂ and this compound was applied to the DSC to improve its performance. As a result, the current density of the DSC using the Nb₂O5-TiO₂ compound on the photoelectrode was increased, because the internal resistance concerned to the electron transfer in the photoelectrode of DSC was decreased. However, large amount of the Nb₂O5 induces the decrease of the efficiency of the DSC because the surface area to attach dye molecules is decreased due to the large particle of Nb₂O5. Therefore, it is important to optimize the mixture ratio of the Nb₂O5-TiO₂ compound for maximizing the performance of the DSC. Finally, the most optimum performance of the DSC was shown in case of the Nb₂O5 concentration of 10 wt% of the Nb₂O5-TiO₂ compound.