• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1895-1897
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• 1999

This paper describes the fabrication and performance characterizations of the CIGS$(CuInGaSe_2)$ solar cells and its prototype module. The CIGS cell and module were fabricated on the sodalime glass$(5\times5cm^2)$ by the well known three stage co-evaporation and series connection followed by patterning process. respectively. The developed minimodule with active area of $14.7cm^2$ showed 6.0% solar efficiency($V_{oc}$=3.2V, $I_{sc}$=79.8mA, FF=34.6%) in AM 1.5 condition.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1928-1930
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• 1999

This paper describes on the growth of a ${\mu}c$-Si:H film on low cost substrate like glass by Hot Wire CVD method. The ${\mu}c$-Si:H film, prepared in 50mTorr pressure, $1800^{\circ}C$ wire temperature, and $H_2/SiH_4$ 10 showed three clear peaks. (111), (220), and (311) in X-ray spectroscopy. The crystallite size and crystalline volume fraction, calculated from Raman spectroscopy, was about 6nm and 70%, respectively. The FTIR transmission spectra of the film showed a different absorption peak with a-Si:H film around $2000-2100cm^{-1}$.

• 복합신소재구조학회 논문집
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• 제1권1호
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• pp.16-26
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• 2010

In this paper, we present the result of investigations pertaining to the development of the floating type photovoltaic energy generation system. Pultruded FRP has superior mechanical and physical properties compared with those of conventional structural materials. Since the FRP has an excellent corrosion-resistance and high specific strength and stiffness, the FRP material may be highly appreciated for the development of the floating type photovoltaic energy generation system. In the paper, we discussed the development concepts of the floating type photovoltaic energy generation system, briefly. The mechanical properties of the FRP structural member used in the development are investigated through the tensile and compression tests. Test results are used in the finite element analysis and the design of the system. In addition, bolted connections of the members are briefly discussed and the strengths of FRP bolted connections are estimated based on the results of experiments. The experimental results are compared with the finite element analysis results and discussed briefly. The floating type photovoltaic energy generation system is designed, fabricated, and installed successfully in site.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1427-1429
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• 2001

Polycrystalline silicon(poly-Si) films are deposited on low temperature glass substrate by Hot-Wire CVD(HWCVD). The structural properties of the poly-Si films are strongly dependent on the wire temperature($T_w$). The films deposited at high $T_w$ of 2000$^{\circ}C$ have superior crystalline properties; average lateral grain sizes are larger than $1{\mu}m$ and there at·e no vertical grain boundaries. The surface of the high $T_w$ samples are naturally textured like pyramid shape. These large grain size and textured surface are believed to give high current density when applied to solar cells. However, the poly-si films are structurally porous and contains high defect density, by which high concentration of C and O resulted within the films by air-penetration after removed from chamber.

• 한국태양에너지학회 논문집
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• 제27권2호
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• pp.29-35
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• 2007

Monitoring system is constructed for evaluating and analyzing performance of installed 50kW grid-connected PV system and have been monitored since October 2005. As climatic and irradiation conditions have been varied through long-term operation, there is necessity for evaluating numerical values of PV(Photovoltaic) system performance to observe the overall effect of environmental conditions on their operation characteristics. This paper presents performance monitoring results and analysis on component perspective(PV array and power conditioning system) and global perspective(yield, losses) of PV system for one year monitoring periods.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1763-1765
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• 2000

This paper presents deposition and characterizations of microcrystalline silicon ($\mu$ c-Si:H) films prepared by hot wire chemical vapor deposition at substrate temperature at 300$^{\circ}C$. The flow rates of $SiH_4$ gas are critical parameter for the formation of Si films with microcrystalline phase. We could obtain $\mu$ c-Si:H with columnar grain structure and volume fraction of 75% without H2 dilution. The electronic properties, hydrogen bonding configurations, and $H_2$ concentration inside the films are also strongly affected by $SiH_4$ flow rate, which is provided in this paper.

• Current Photovoltaic Research
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• 제10권1호
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• pp.1-5
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• 2022

Bifacial photovoltaic (PV) technology has received considerable attention in recent years due to the potential to achieve a higher annual energy yield compared to its monofacial PV systems. In this study, we fabricated the bifacial c-Si PV module with a shingled design using the conventional patterned bifacial solar cells. The shingled design PV module has recently attracted attention as a high-power module. Compared to the conventional module, it can have a much more active area due to the busbar-free structure. We employed the transparent backsheet for a light reception at the rear side of the PV module. Finally, we achieved a conversion power of 453.9 W for a 1300 mm × 2000 mm area. Moreover, we perform reliability tests to verify the durability of our Shingled Design Bifacial c-Si Photovoltaic module.

• 한국인터넷방송통신학회논문지
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• 제20권5호
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• pp.157-162
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• 2020

기존의 태양광발전장치 중에서 반사판을 갖춘 장치는 태양에너지(일사량)를 태양광 모듈 표면에 집중적으로 입사되는 방식이지만 태양광 모듈을 통해 다시 반사되어 손실되는 태양에너지(일사량)는 고려되지 않는 구조로 되어있다. 또한, 태양광 모듈 주위에 반사판을 설치하여 발전량을 높이는 방안이 제시되고 있지만, 이는 다른 태양광 모듈의 음영에 따른 발전 저하에 영향을 주고 있다. 따라서 이러한 문제점을 개선하고자 본 논문에서는 1) 음영에 따른 태양광 모듈의 발전에 영향을 주지 않으면서 2) 태양광 모듈에서 반사되어 손실되는 태양에너지(일사량)를 회전하는 반사판을 이용하여 태양광 모듈에 다시 입사되는 방법을 연구 및 제안한다. 따라서 손실된 태양에너지(일사량)의 무수한 반사 각도에 따른 태양에너지를 재활용할 수 있는 방법을 통해 태양에너지(일사량)에 대한 손실을 최소화, 동일 일사량에 대한 발전량을 최대화하므로 태양광발전장치의 발전량을 증가시킬 수 있다.

• 한국태양에너지학회 논문집
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• 제29권1호
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• pp.18-23
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• 2009

We intend to describe a 12kW building-integrated photovoltaic system which was applied into the south wall of a new building. This study showed the results that were appeared from describing the PV module manufacture and installation process, and performing generation performance analysis of BIPV system. From the result we confirmed that the generation performance of the BIPV system was changed by season. The performance ratio(PR) was about 83.6% in winter and it means that performance of this BIPV system was so good in that season. On the other hand, the PR in summer was about 75.0% dropped about 8%. It was believed that the change was influenced by the reduction of solar radiation irradiated into the PV modules by installation position and rainy spell in summer. And we also confirmed that low irradiation condition is cause of the additional loss in the total PV system. In this case, the efficiency ratio of PCS drops significantly at low input loads and the average conversion efficiency of PCS in summer was 76.4% decreased about 10% from 86% in winter.

• 한국태양에너지학회 논문집
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• 제29권1호
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• pp.32-37
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• 2009

Photovoltaic(PV) permits the on-site production of electricity without concern for fuel supply or environmental adverse effects. The electrical power is produced without noise and little depletion of resources. So BIPV(Building-Integrated Photovoltaic) system have been increased around the world. Hereby the relative installation costs of the system will be relatively low compared to traditional installations of PV in high-rise buildings. This paper examined possibility of building integrated balcony PV system and analyzed both performance and problems of this system. The system is influenced by conditions such as irradiation, module temperature, shade and architectural component etc. If this BIPV system of 1.1kW is possible the natural ventilation in the summer case, the temperature of PV module decrease and then the efficiency of PV system increase generally. By the results, the annual averaged PR of BIPV system of cold facade type is about 74.7%.