• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.939-942
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• 2004

Al doped Zinc Oxide(ZnO:Al) films, which is widely used as a transparent conductor in optoelectronic devices such as solar cell, liquid crystal display, plasma display panel, thermal heater, and other sensors were Prepared by using the capacitively coupled RF magnetron sputtering method. In this paper the effect of RF discharge power on the electrical, optical and structural properties were investigated experimentally. The results show that the structural and electrical properties of the film are highly affected by the variation of RF discharge power. The optimum growth conditions were obtained for films doped with 2 wt% of $Al_2O_3$ and 200 W in RF discharge power, which exhibit a resistivity of $10.4{\times}10^{-4}{\Omega}-cm$ associated with a transmittance of 89.66 % for 1000nm in films thickness in the wavelength range of the visible spectrum.

• 한국세라믹학회지
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• 제51권3호
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• pp.170-176
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• 2014

Effective glass frit compositions enabled to absorb laser energy, and to seal a commercial dye-sensitized solar-cell-panel substrate were developed by using $V_2O_5$-based glasses with various amounts of $TeO_2$ substitution. The latter was intended to increase the lifetime of the solar cells. Substitution of $V_2O_5$ by $TeO_2$ provided a strong network structure for the glasses via the formation of tetrahedral pyramids in the glass, and changed the various glass properties, such as glass transition temperature ($T_g$), dilatometric softening point ($T_d$), crystallization temperature, coefficient of thermal expansion (CTE), and glass flowage without any detrimental effect on the laser absorption property of the glasses. The thermal expansion mismatch (${\Delta}{\alpha}$) between the glass frit and the substrate could be controlled within less than ${\pm}5%$ by addition of 10 wt% of ${\beta}$-eucryptite. An 810 nm diode laser was used for the sealing test. The laser sealing test revealed that the VZBT20 glass frit with 10 wt% ${\beta}$-eucryptite was successfully sealed the substrates without interfacial cracks and pores. The optimum sealing conditions were provided by a beam size of 3 mm, laser power of 40 watt, scan speed of 300 mm/s, and 200 irradiation cycles.

• Current Photovoltaic Research
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• 제3권3호
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• pp.101-105
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• 2015

ZnO is gathering great interest for large square optoelectrical devices of flat panel display (FHD) and solar cell as a transparent conductive oxide (TCO). Herewith, Mg and IIIA (Al, In) co-doped ZnO films were prepared on SLG substrate using RF magnetron sputtering system. The effect of variation of atomic weight % of Mg and ZnO have been investigated. The atomic weight % Al and In are of 3% and kept constant throughout. The numbers of samples were prepared according to their different contents, which are $M_{3%}AZO_{94%}$, $M_{4%}AZO_{93%}-(MAZO)$ and $M_{3%}IZO_{94%}$, $M_{4%}IZO_{93%}-(MIZO)$ respectively. A RF power of 225 W and working pressure of 6 m Torr was used for the deposition at $300^{\circ}C$. All of the two thin film show good uniformity in field emission scanning electron microscopy image. $M_{3%}AZO_{94%}$ thin film shows overall better performance among the all. The film shows the best lowest resistivity, carrier concentration, mobility and Sheet resistance and is found to be are of $8.16{\times}10^{-4}{\Omega}cm$, $4.372{\times}10^{20}/cm^3$, $17.5cm^2/vs$ and $8.9{\Omega}/sq$ respectively. Also $M_{3%}AZO_{94%}$ thin film shows the relatively high optical band gap energy of 3.7 eV with high transmittance more than 80% in visible region required for the better solar cell performance.

• 한국세라믹학회지
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• 제52권2호
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• pp.103-107
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• 2015

The effective glass frit composition used to absorb laser energy and to seal commercial dye-sensitized solar cell panel substrates has been previously developed using $V_2O_5-TeO_2$-based glass with 10 wt% ${\beta}$-eucryptite as a CTE controlling filler. The optimum sealing conditions are provided using a 3 mm beam, a laser power of 40 watt, a scan speed of 300 mm/s, and 200 irradiation cycles. In this study, the feasibility of the developed glass frit is investigated in terms of the sealing strength and chemical durability against the commercial iodide/triiodide electrolyte solution and fluorine-doped tin oxide (FTO) electrode in order to increase the solar cell lifetime. The sealing strength of the laser-sealed $V_2O_5-TeO_2$-based glass frit is $20.5{\pm}1.7MPa$, which is higher than those of thermally sealed glass frit and other reported glass frit. Furthermore, the developed glass frit is chemically stable against electrolyte solutions. The glass frit constituents are not leached out from the glass after soaking in the electrolyte solution for up to three months. During the laser sealing, the glass frit does not react with the FTO electrode; thus, the resistivity of the FTO electrode beneath the laser-sealed area remains the same.

• 한국전산유체공학회지
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• 제13권2호
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• pp.48-54
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• 2008

COMS (Communication, Ocean and Meteorological Satellite) is a geostationary satellite and has been developing by KARI for communication, ocean and meteorological observations. It will be launched by ARIANE 5. Ka-band components are installed on South panel, where single solar array wing is mounted. Radiators, embedded heat pipes, external heat pipe, insulation blankets and heaters are utilized for the thermal control of the satellite. The Ka-band payload section is divided several areas based on unit operating temperature in order to optimize radiator area and maximize heat rejection capability. Other equipment for sensors and bus are installed on North panel. The ocean and meteorological sensors are installed on optical benches on the top floor to decouple thermally from the satellite. During the transfer orbit operation, satellite will be under severe thermal environments due to low dissipation of components, satellite attitudes and LAE(Liquid Apogee Engine) firing. This paper presents temperature and heater power prediction and validation of thermal control design during transfer orbit operation.

• 한국공간구조학회논문집
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• 제8권6호
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• pp.85-94
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• 2008

본 논문은 국내 외 PV 통합 프로젝트를 구조 디자인의 시각에서 평가한 논문이다. 국내 외 대표사례를 공공시설과 전시시설로 구분하여 국내 사례 3가지, 해외사례 3가지의 대표 사례를 들었다. 평가항목은 건축물과의 자연스러운 통합, 엔지니어링디테일, 혁신적인 새로운 설계의 항목으로 평가하고 그 결과를 비교 분석하였다. 국내의 공공시설 및 전시시설은 주로 옥상층에 독립지지방식을 사용한 사례가 많았으며 아직 디자인적 통합부분에서는 미흡함을 알 수 있었다. 하지만 전시시설은 건축물 설계단계에서부터 PV 패널을 염두에 둔 사례들이 증가하고 있었다. 그에 비해 해외 공공시설 및 전시시설의 경우는 주로 모듈 접합방식을 사용하면서 구조적인 통합과 디자인적 통합을 동시에 이루었으며 사용하는 PV패널의 종류도 좀 더 다양함을 알 수 있었다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 추계 학술대회논문집
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• pp.227-231
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• 2007

COMS (Communication, Ocean and Meteorological Satellite) is a geostationary satellite and has been developing by KARI for communication and ocean and meteorological observations. It will be launched by ARIANE 5. Ka-band components are installed on South panel, where single solar array wing is mounted. Radiators, embedded heat pipes, external heat pipe, insulation blankets and heaters are utilized for the thermal control of the satellite. The Ka-band payload section is divided several areas based on unit operating temperature in order to optimize radiator area and maximize heat rejection capability. Other equipment for sensors and bus are installed on North panel. The ocean and meteorological sensors are installed on optical benches on the top floor to decouple thermally from the satellite. During the transfer orbit operation, satellite will be under severe thermal environments due to low dissipation of components, satellite attitudes and LAE(Liquid Apogee Engine) firing. This paper presents temperature and heater power prediction and validation of thermal control design during transfer orbit operation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 C
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• pp.1411-1413
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• 1997

The thin film that is electrically conductive and optically transparent is called conductive transparent thin film. ITO(Indium-Tin Oxide) which is a kind of conductive transparent thin film has been widely used in solar cell, transparent electrical heater, selective optical filter, FDP(Flat Display Panel) such as LCD (Liquid Crystal Display), PDP(Plasma Display Panel) and so on. Especially in PDP, ITO films is used as a transparent electrode in order to maintain discharge and decrease consumption power through the improvement of cell structure. In this study, we prepared ITO by reactive r.f. sputtering with indium-tin(Sn wt 10%) alloy target instead of indium-tin oxide target. The ITO films deposited at low temperature $150^{\circ}C$ and 8% $O_2$ partial pressure showed about $3.6{\Omega}/{\square}$. At the end of firing, the resistance of ITO was decreased, the optical transparence was improved above 90%.

• 생물환경조절학회지
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• 제31권4호
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• pp.356-365
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• 2022

영농형 태양광 발전은 농경지에서 작물을 생산함과 동시에 식물이 요구하는 광포화점 이상의 광을 이용하여 전기를 생산하는 시스템이다. 새로운 농가 소득원의 개발을 위하여 포도원에 태양광 패널을 설치하고 수체의 생육과 과실 발육 특성을 평가하여 영농형 태양광의 활용성을 탐색하고 향후 재배기술을 개발하는 데 필요한 정보를 제공하고자 연구를 진행하였다. 152 × 68 × 3.5cm 크기의 구조물에 영농형 150Wp (36cell) 모듈을 포도나무 재식열에 따라 배치하고, 과원의 환경과 식물생육을 분석하였다. 무처리에는 겨울철 풍속이 0.4-0.6m·s^-1에 도달하였으나, 시설 설치구에서는 0.01-0.02m·s^-1에 머물렀다. 삽수 수피의 탄수화물함량은 시설 설치구에서 183-184m·g^-1으로 무처리구(181-198mg·g^-1)에 비해 큰 차이가 없으며 삽수의 발아율도 큰 차이가 없었다. 잎의 엽록소의 함량은 처리구에서 높게 나타났다. 수확후 과실의 특성으로는 과립중, 과방중, 당도, 과피색의 차이는 없었다. 다만 시설구에서 숙기가 5-7일정도 늦어졌으며, 변색기의 착색에는 약간 차이가 있었다. 영농형 태양광 패널을 설치한 과원에서 포도나무와 과실의 발육은 유의차가 없었고, 설치구에서 착색이 지연되었다. 이러한 결과는 향후 포도원에서 영농형 태양광 시설을 설치하여 포도를 생산하는 기술 개발에 필요한 정보로 활용될 수 있을 것이다.

• 한국항공우주학회지
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• 제36권4호
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• pp.384-392
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• 2008

위성의 전력계, 질량, 비용 등과 같은 형상 요소들의 개략적인 제원 도출은 본격적인 위성개발 전 반드시 수행되어야 할 중요한 과정이다. 본 논문에서는 최근 개발된 국내외 위성 개념설계 도구들의 주요한 특징들을 조사하고, 이를 바탕으로 초기 개념설계 절차를 정리하였다. 위성 개념설계는 탑재체와 임무에 근거하여 필요한 전력을 추정하고 위성운용에 필요한 태양전지판과 배터리와 같은 전력계를 추정한다. 다음으로 기존 위성들의 데이터베이스를 기반으로 탑재체질량에 따른 전체 위성 및 주요 서브시스템의 질량을 결정한다. 비용 역시 복잡한 계산 없이 기존 위성들의 데이터베이스를 바탕으로 대략적인 추정이 가능하다.