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배수현(Soohyun Bae),오원욱(Wonwook Oh),강윤묵(Yoonmook Kang),이해석(Hae-Seok Lee),김동환(Donghwan Kim) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.2
When the PV module is illuminated in a high temperature region, solar cells are also exposed to the high temperature external environment. The operating temperature of the solar cell inside the module is increased, which causes the power drops. Various efforts have been made to reduce the operating temperature and compensate the power of solar cells according to the outdoor temperature such as installing of a cooling system. Researches have been also reported to lower the operating temperature of solar cells by improving the heat dissipation properties of the backsheet. In this study, we conducted a test to measure the internal temperature of each module components and the external temperature when the light was irradiated according to the surrounding temperature. Backsheets with different thermal conductivities were compared in the test. Finally, in order to explain the temperature difference between the solar cell and the outside of the module, we proposed an evaluation method of the heat transfer characteristics of photovoltaic modules with different backsheet.
이지은,배수현,오원욱,강윤묵,김동환,이해석,Lee, Ji Eun,Bae, Soohyun,Oh, Wonwook,Kang, Yoonmook,Kim, Donghwan,Lee, Hae-Seok 한국재료학회 2015 한국재료학회지 Vol.25 No.4
This paper presents the impact of partial shading on $CuIn_xGa_{(1-x)}Se_2(CIGS)$ photovoltaic(PV) modules with bypass diodes. When the CIGS PV modules were partially shaded, the modules were under conditions of partial reverse bias. We investigated the characterization of the bypass diode and solar cell properties of the CIGS PV modules when these was partially shaded, comparing the results with those for a crystalline silicon module. In crystalline silicon modules, the bypass diode was operated at a partial shade modules of 1.67 % shading. This protected the crystalline silicon module from hot spot damage. In CIGS thin film modules, on the other hand, the bypass diode was not operated before 20 % shading. This caused damage because of hotspots, which occurred as wormlike defects in the CIGS thin film module. Moreover, the bypass diode adapted to the CIGS thin film module was operated fully at 60% shading, while the CIGS thin film module was not operated under these conditions. It is known that the bypass diode adapted to the CIGS thin film module operated more slowly than that of the crystalline silicon module; this bypass diode also failed to protect the module from damage. This was because of the reverse saturation current of the CIGS thin film, $1.99{\times}10^{-5}A/cm^2$, which was higher than that of crystalline silicon, $8.11{\times}10^{-7}A/cm^2$.
결정질 실리콘 태양전지의 전면 전극의 패턴에 따른 전류 밀도 및 특성 저항 변화에 대한 영향과 효율 변화
정수정,신승현,최동진,배수현,강윤묵,이해석,김동환,Jeong, Sujeong,Shin, Seunghyun,Choi, Dongjin,Bae, Soohyun,Kang, Yoonmook,Lee, Hae-seok,Kim, Donghwan 한국재료학회 2017 한국재료학회지 Vol.27 No.10
In commercial solar cells, the pattern of the front electrode is critical to effectively assemble the photo generated current. The power loss in solar cells caused by the front electrode was categorized as four types. First, losses due to the metallic resistance of the electrode. Second, losses due to the contact resistance of the electrode and emitter. Third, losses due to the emitter resistance when current flows through the emitter. Fourth, losses due to the shading effect of the front metal electrode, which has a high reflectance. In this paper, optimizing the number of finger on a $4{\times}4$ solar cell is demonstrated with known theory. We compared the short circuit current density and fill factor to evaluate the power loss from the front metal contact calculation result. By experiment, the short circuit current density($J_{sc}$), taken in each pattern as 37.61, 37.53, and $37.38mA/cm^2$ decreased as the number of fingers increased. The fill factor(FF), measured in each pattern as 0.7745, 0.7782 and 0.7843 increased as number of fingers increased. The results suggested that the efficiency(Eff) was measured in each pattern as 17.51, 17.81, and 17.84 %. Throughout this study, the short-circuit current densities($J_{sc}$) and fill factor(FF) varied according to the number of fingers in the front metal pattern. The effects on the efficiency of the two factors were also investigated.
결정질 실리콘 태양전지 표면 역 피라미드 구조의 특성 분석
양지웅(Jeewoong Yang),배수현(Soohyun Bae),박세진(Se Jin Park),현지연(Ji Yeon Hyun),강윤묵(Yoonmook Kang),이해석(Hae-Seok Lee),김동환(Donghwan Kim) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.3
To generate more current in crystalline silicon solar cells, surface texturing is adopted by reducing the surface reflection. Conventionally, random pyramid texturing by the wet chemical process is used for surface texturing in crystalline silicon solar cell. To achieve higher efficiency of solar cells, well ordered inverted pyramid texturing was introduced. Although its complicated process, superior properties such as lower reflectance and recombination velocity can be achieved by optimizing the process. In this study, we investigated optical and passivation properties of inverted pyramid texture. Lifetime, implied-Voc and reflectance were measured with different width and size of the texture. Also, effects of chemical rounding at the valley of the pyramid were observed.
알루미늄-실리콘 공융 조성 합금 페이스트를 이용한 국부 후면 전계 태양전지 특성 분석
최재욱(Jae-Wook Choi),박성은(Sungeun Park),배수현(Soohyun Bae),김성탁(Seongtak Kim),박세진(Se Jin Park),박효민(Hyomin Park),강윤묵(Yoonmook Kang),이해석(Hae-Seok Lee),김동환(Donghwan Kim) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.4
Characteristic of aluminum-silicon alloy paste which is applied on the rear side of PERC cell was investigated. The paste was made by aluminum-silicon alloy with eutectic composition to avoid the formation of void which is responsible for the degradation of the open-circuit voltage. Also, the glass frit component of the paste was changed to improve the adhesion of aluminum-silicon paste. We observed the formation of void and local back surface field between aluminum electrode and silicon base by SEM. The light IV, quantum efficiency and reflectance of the solar cells were characterized and compared for each paste.