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김희제,이경준,Kim, Hee-Je,Lee, Kyung-Jun 선박안전기술공단 2011 선박안전 Vol.31 No.-
경제성장과 산업 사회생활의 고도화에 따라서 증대하는 전력수요에 대해서, 에너지자원량과 지구환경의 제약이 거론되고 있는 최근의 에너지를 둘러싼 심각한 상황인식을 고려하여 전력 수급의 장기적 안정을 확보하기 위해서는, 전력수급양면에 걸친 대책이 강화되어야 한다는 것이 현재 관련 전문가들의 공통된 의견으로 수렴되고 있다. 따라서 종래의 전력공급은 대규모 전원의 개발을 중심으로 수요에 대응해 왔지만, 앞으로는 수요의 관리 제어를 고려한 부하 관리(Load Management) 또는 수요측관리(Demand-Side Management)를 적극적으로 추진해가고, 나아가 다양한 에너지원의 효율적 활용을 목표로 한 분산형전원의 개발과 도입을 적극적으로 추진하는 등의 폭넓은 정책이 마련 시행될 필요가 있다. 그 대안중의 하나로 태양광 하이브리드 선박이 널리 보급될 경우 하나의 분산전원으로서 그 역할을 할 것으로 기대된다.
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.
펄스형 Nd:YAG 레이저를 이용한 FTO 식각에 대한 연구
金熙濟(Hee-Je Kim),朴盛駿(Sung-Joon Park),孫珉圭(Min-Kyu Son),李東吉(Dong-Kil Lee),李庚俊(Kyoung-Jun Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.8
In material processing, a laser system with optimal laser parameters has been considered to be significant. Especially, the laser scribing technology is thought to be very important for fabricating DSSC(Dye sensitized solar cell) modules with good quality. Moreover, the TEM?? mode laser beam is the most dominant factor to decide the IPCE(Incident photon to current conversion efficiency) characteristics. In order to get the TEM?? mode, a pin-hole is inserted within a simple pulsed Nd:YAG laser resonator. And the spatial field distribution is measured by using three size pin-hole diameters of 2.0, 6.0 ㎜ respectively. At that moment, each case has the same laser beam energy by adjusting the discharge voltage and pps(pulse per second). From those results, it is known that the pin-hole size of 2.0 ㎜ has the perfect TEM?? mode. In addition, at the charging voltage of 1000 V, 10 pps and the feeding speed of 1.11 ㎜/sec, the SEM photo of FTO(Fluorine-doped tin oxide) thin film layers shows the best scribing trace.
정전분무법을 이용한 염료감응형 태양전지의 TiO₂ 박막 특성에 관한 연구
김희제(Hee-Je Kim),이정기(Jeong-Gee Lee),홍지태(Ji-Tae Hong),김호성(Ho-Sung Kim),이동길(Dong-Gil Lee),하국성(Kook-Sung Hur),안태풍(Tae-Pung An),장진주(Jin-Ju Jang) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
Dye sensitized solar cells(DSCs) have been very economical and easy method to convert solar energy to electricity. DSC can reach low costs in future outdoor power applications. However, to commercialize the DSC, there are still many shortages to overcome such a low efficiency in a large size DSC. In this study, DSCs were fabricated by an electrospray coating method for the TiO₂ thin film. They were compared with DSCs prepared by conventional coating methods. We conducted an experiment to obtain the optimized parameters of voltage, flow rate, incident angle and distance in the electrospray method. After we fabricated TiO₂ film using that way, we investigated the characteristics of DSC through I-V Curve, SEM and EIS. This novel method shows stable performance with an energy conversion efficiency of 3.44 % under 1 sun illumination (AM 1, Pin of 100 mW/㎠).
염료감응형 태양전지의 상대전극 Pt 필름 두께와 증착 각도가 효율에 미치는 영향에 관한 연구
김희제(Hee-Je Kim),여태빈(Tae-Bin Yeo),박성준(Sung-Joon Park),김휘영(Whi-Young Kim),서현웅(Hyunwoong Seo),손민규(Min-Kyu Son),채원용(Won-Yong Chae),이경준(Kyoung-Jun Lee) 대한전기학회 2010 전기학회논문지 Vol.59 No.3
Sputter deposition on a Pt counter electrode was studied using radio frequency (RF) plasma as the improvement of incident photon to current conversion efficiency (IPCE) for dye-sensitized solar cells (DSCs). Effects of the sputtering thickness and the incident angle on a Pt counter electrode for DSCs were investigated. Experiments to get the optimal sputtering time for the performance of the DSCs were carried out. And it is found that the optimized sputtering time was 120 seconds, in addition, the incident angles of the substrate was adjusted from 0° to 60°. The maximum efficiency of 5.37% was obtained at the incident angle of 40° with an active cell area of 1㎠.
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.