• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.882-884
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• 2005

A new rectangular shape microlens array having high sag for solid-state lighting is presented. Proposed microlens, which has high sag, over $375{\mu}m$ and large diameter, over 3 mm can enormously enhance output optical extraction efficiency. Rectangular shape of microlens can maximize the fill factor of light-emitting-diode (LED) package and minimize the optical loss at the same time. This wafer level microlens array is fabricated on LED package. It has many advantages in optical properties, low cost, high aligning accuracy, and mass production.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2012년도 춘계학술발표회 논문집
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• pp.227-228
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• 2012

In interfaces between carbon black or Pt and FTO glass in dye-sensitized solar cell counter electrodes, a marginal resistant channel for electrons, we tried to improve the connection by modifying the sintering process. A stepwise sintering process for carbon black and Pt counter electrodes was applied and its effect on power conversion efficiency was studied. Power conversion efficiencies of built-in DSSC made by a one-step sintering process with carbon black and Pt counter electrodes were about 5.01% and 5.02%, respectively. Cells made with the stepwise sintering process were 5.96% and 6.21%, respectively, indicating an 20% improvement. Fill factor (FF) increased, and it was them main reason for the power conversion efficiency improvement. Step wise sintering increased the adhesion of the interface and reduced the film thickness and surface roughness. As a result, the resistivity of the counter electrode and EIS impedance of DSSCs decreased.

• 태양에너지
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• 제7권1호
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• pp.30-34
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• 1987

Experimental results are discussed concerning temperature effects from $25^{\circ}C$ to $100^{\circ}C$ on amorphous silicon solar cells. N-I-P hydrogenated amorphous silicon solar cells are fabricated on stainless steel and indium tin oxide glass substrates. The open circuit voltage, short circuit current, fill factor and conversion efficiency have been measured under AM1 condition as a function of temperature. The open circuit voltage decreased by $2.6mV/^{\circ}C$ while the short circuit current increases with increased temperature. The conversion efficiency is almost independent of temperature which is contrary to widely using single crystalline solar cells of which efficiencies decrease with increasing temperature.

• Current Photovoltaic Research
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• 제6권4호
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• pp.94-101
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• 2018

Light elevated temperature induced degradation (LeTID) was noted as an issue in multi-crystalline silicon solar cells (MSSC) by Ram speck in 2012. In contrast to light induced degradation (LID), which has been researched in silicon solar cells for a long time, research about both LeTID and the mechanism of LeTID has been limited. In addition, research about LeTID in single-crystalline silicon solar cells (SSSC) is even more limited. In order to improve understanding of LeTID in SSSC with a passivated emitter rear contact (PERC) structure, we fabricated four group samples with boron and oxygen factors and evaluated the solar cell characteristics, such as the cell efficiency, $V_{oc}$, $I_{sc}$, fill factor (FF), LID, and LeTID. The trends of LID of the four group samples were similar to the trend of LeTID as a function of boron and oxygen.

• International Journal of Computer Science & Network Security
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• 제22권11호
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• pp.229-235
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• 2022

This study aims to substantiate an interdisciplinary methodology for automated analysis and qualitative assessment of legislation and court decisions. The development of this kind of methodology will make it possible to fill a number of methodological gaps in various research areas, including law effectiveness assessment and legal monitoring. We have defined a methodology based on the interdisciplinary principles and tools. In general, it should be noted that even at the level of qualitative assessment made with the use of the methodology described above, the accumulation of knowledge about the relationship between legal objectives, indicators and computer methods of their identification can reduce the role of expert knowledge and subjective factor in the process of assessment, planning, forecasting and control over the state of legislation and law enforcement. Automation of intellectual processes becomes inevitable in a digital society, but, releasing experts from routine work, simultaneously reorients it to development of interdisciplinary methods and control over their application.

• 대한전자공학회논문지
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• 제23권1호
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• pp.50-57
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• 1986

The fabricatoin sequence of GaAs MIS type diode and its electrical characteristics are presented. Used wafers were undoped GaAS wafer adn Te-doped GaAs wafer. Au and AuGe/Ni was used as schottky contact metal and ohmic contact metal respectively. Oxide layer on GaAs surface was formed by water vapor saturated oxide growth technique and dry oxidation technique. In Te-doped GaAs wafer, cutin voltage of MIS type diode was enhanced about 3V comparing with non-oxide layer diode. From light I-V characteristics fill factor of MIS type Te-doped GaAs diode was about 64%, Voc(open circuit voltage) was 0.67V.

• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.336-340
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• 2012

Wide band gap p-type hydrogenated amorphous silicon oxide (a-SiO:H) buffer layer has been used at the interface of transparent conductive oxide (TCO) and hydrogenated amorphous silicon (a-Si:H) p-type layer of a p-i-n type a-Si:H solar cell. Introduction of 5 nm thick buffer layer improves in blue response of the cell along with 0.5% enhancement of photovoltaic conversion efficiency (η). The cells with buffer layer show higher open circuit voltage (Voc), fill factor (FF), short circuit current density (Jsc) and improved blue response with respect to the cell without buffer layer.

• 한국전기전자재료학회논문지
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• 제37권4호
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• pp.439-444
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• 2024

This study investigates the post-thermal treatment effects on the efficiency of silicon heterojunction solar cells, specifically examining the influence of annealing on p-type microcrystalline silicon oxide and ITO thin films. By assessing changes in carrier concentration, mobility, resistivity, transmittance, and optical bandgap, we identified conditions that optimize these properties. Results reveal that appropriate annealing significantly enhances the fill factor and current density, leading to a notable improvement in overall solar cell efficiency. This research advances our understanding of thermal processing in silicon-based photovoltaics and provides valuable insights into the optimization of production techniques to maximize the performance of solar cells.

• 한국지반환경공학회 논문집
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• 제23권2호
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• pp.25-36
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• 2022

본 연구에서는 감압정의 침투수 처리 효과를 정량적으로 분석하여 소규모 필댐과 하천제방에서 제체를 통과하는 침투수의 처리 효과를 확인하였다. 이를 위해 댐과 제방에서의 제체와 기초지반의 투수 특성에 따른 침투해석을 수행하여 침투수의 거동특성을 파악하여 댐 제체 선단에 작용하는 양압력을 분석하였다. 또한 감압정의 설치 조건을 변수로 분석하여 댐 또는 제방의 제체 선단에 작용하는 양압력의 감소 효과를 분석함으로써 침투수 처리 효과를 분석하였다. 감압정은 파이핑 현상 또는 양압력을 유발하는 제체의 선단 하부 기초지반에서의 작용 간극수압을 감소시키는 효과가 있는 것으로 평가되었으며, 제체의 높이 및 비탈면 기울기와 같은 기하학적 조건에 크게 영향을 받지 않고 간극수압을 관리할 수 있는 것으로 확인되었다. 투수성이 상대적으로 큰 조립토 지반에 비해 세립토 지반에서 감압정의 간극수압 저감 효과는 상대적으로 저하되지만 감압정이 설치되지 않은 조건에 비해서 간극수압 저감 효과를 기대할 수 있는 것으로 확인되었다. 감압정의 직경, 설치 깊이에 따라서 감압정의 저감 효과는 상대적으로 차이가 발생하지만 감압정의 설치 깊이가 침투수 관리에 가장 효과적인 것으로 확인되었다.

• 공업화학
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• 제21권2호
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• pp.137-141
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• 2010

4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole과 1,4-bis(dodecyloxy)-2,5-divinylbenzene을 Heck coupling 중합법을 이용하여 poly[4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole]-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene (PPVTBT) 공중합체를 합성하였다. 합성한 PPVTBT의 최대흡수파장과 band gap은 각각 550 nm와 1.74 eV이고 HOMO와 LUMO enegry level은 각각 -5.24 eV, -3.50 eV로 나타났다. 합성한 공중합체인 PPVTBT와 (6)-1-(3-(methoxycarbonyl)propyl)-{5}-1-phenyl[5,6]-$C_{61}$(PCBM)을 1 : 6의 중량비로 blend하여 제작한 소자의 효율은 AM 1.5 G, 1 sun 조건($100mA/cm^{2}$)에서 0.16%의 효율을 보였다. 그리고 소자의 Jsc (short circuit current), FF (fill factor)와 Voc (open circuit voltage)는 각각 $0.74mA/cm^{2}$, 31%, 0.71 V로 나타났다.