• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.321-322
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• 2009

Al doped ZnO films deposited on glass substrate using RF magnetron sputtering in Ar and $Ar+H_2$ gas ambient at $100^{\circ}C$. The films deposited in $Ar+H_2$ were hydrogen-annealed at the temperature of $150\sim300^{\circ}C$ for 1hr. The lowest resistivity of $4.25\times10^{-4}{\Omega}cm$ was obtained for the AZO film deposited in $Ar+H_2$ after hydrogen annealing at $300^{\circ}C$ for 1hr. The average transmittance is above 85% in the range of 400-1000 nm for all films. The absorption efficiency of solar cell was improved by using the optimized AZO films as a top electrode.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.428-430
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• 2008

Dye-sensitized solar cell has many internal resistant components such as Pt counter electrode, $TiO_2$/dye/electrolyte, charge diffusion, sheet resistance of TCO. Among these, the resistance about the counter electrode can be reduced by increasing the roughness factor of Pt counter electrode. This causes the increase of fill factor and improvement of efficiency. And the amount of light reflection on the counter electrode also increases as the roughness factor goes up. In our experiment, we suggest a new deposition structure of Pt thin film that is a stepped-type structure. The more step lines are in the counter electrode, the more roughness factor is. As a result, we get the improvement of fill factor and efficiency by controlling the roughness factor of counter electrode.

• 한국표면공학회지
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• 제46권2호
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• pp.61-67
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• 2013

Thin film solar cells have attracted much attention due to their high cell efficiency, comparatively low process cost, and applicability to flexible substrates. In particular, CIGS solar cells have been widely studied and produced because they demonstrated the highest cell efficiency. However, the deposition process of CIGS films generally includes the selenization process conducted at elevated temperature using toxic $H_2Se$ gas. To avoid this selenization process, CIGS thin films were, in this study, deposited by RF sputtering using single composite CIGS target. In addition, the effects of sputtering bias voltage and heat treatment on the microstructural and morphological changes in deposited CIGS films were investigated and discussed.

• 통합자연과학논문집
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• 제2권4호
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• pp.237-242
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• 2009

As semitransparent dye-sensitized solar cells (DSSCs) have advanced to large-scale applications from lab-level research, the large-scale performance has attracted much attention. Modules of DSSCs have been investigated to optimize the efficiency as a $TiO_2$ systhesis temperature and a surface treatment of $TiCl_4$ aqueous solution. Essentially, these semitransparent modules have an extended structure with lab-scale works with the exception of the dimensions and methods for the series connection. The $5cm{\times}6.5cm$ modules have shown an efficiency of about 6% without a scattering layer. While the fill factors of modules depend on the width of each $TiO_2$ unit cell, they are much less dependent on the lengths of the unit cells.

• 반도체디스플레이기술학회지
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• 제9권3호
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• pp.5-9
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• 2010

Recently, the important issues of solar cell are low cost and high efficiency. Making low cost and high efficiency solar cell, there are many effects to development of inexpensive wafer, simplify process and improve optical, electrical properties. In this the study, the 2 step texturing method using micro blaster was developed to decrease reflection of incident lights. Air bridge electrode structure is suggested to expand the effective surface area and decrease the series resistance of finger electrode. The effects of 1 step texturing and 2 step texturing by micro blaster are compared. Reflectance of 1 step and 2 step texturing are measured 28.7% and 25.5%, respectively. The reflectance of 2 step texturing sample is lower about 3.2% than 1 step textured sample.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.423-423
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• 2012

Recently, many researchers made progress in various studies improving the efficiency of dye-sensitized solar cell. In this paper, we used glass textured by wet-chemical etching process for improvement of photocurrent density in dye-sensitized solar cells. This is owing to increase coefficient of light utilization. Consequently, DSSC using the textured glass exhibit a Jsc of 9.49 mA/$cm^2$, a Voc of 0.73 V and a fill factor (FF) of 0.67 with an overall conversion efficiency of 4.64. This result showed increasing of 20% current density and 16% conversion efficiency using the textured glass. These results suggested that glass texturing was very effective in controlling the light-scattering properties into the photovoltaic cell.

• 반도체디스플레이기술학회지
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• 제13권2호
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• pp.37-44
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• 2014

In this study, the performance of dye-sensitized solar cells with different thickness of the photelectrode film was simulated by using the electron-diffusion differential model. Through this simulation, the relationships between the thickness of the photoelectrode film and the performances (open-circuit voltage, short-circuit current density, and overall photoelectric-conversion efficiency) of cells were understood and the performances with different thickness of the photoelectrede film were also examined. For considering the refractive index in the liquid electrolyte and exploring the scattering effect of titanium dioxide particles with different sizes using the Mie light-scattering theory, the highest scattering effect of each particles was found out and the optimal size of the titanium dioxide particle was determined for light scattering in the photoelectrode film of dye-sensitized solar cell. Through experiment, the mixed titanium dioxide cell was better than the single titanium dioxide cell and generated a higher overall conversion efficiency because the optimal titanium dioxide particles in the phoelectrode film as light scattering.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2565-2569
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• 2010

실리콘 태양전지 셀을 제작하고 효율을 측정하는데 있어 texturing 효과에 대하여 상관성을 조사하였다. Texturing은 $HNO_3$, KOH, NaOH를 각각 사용한 IPA혼합 에칭용액을 만들어서 샘플을 제작하였다. 셀의 분석은 FTIR 과 XRD를 이용하였으며, 실리콘 태양전지 셀의 효율과 화학적인 특성 사이의 상관성을 조사하였다. FTIR 데이터의 950~1350 $cm^{-1}$ 영역에서 픽의 생김새와 셀 표면의 반사도 사이에는 상관성이 있으며, 픽의 쪼개짐이 많으면 표면에서 결합의 상호작용이 활발하지 않다는 것을 의미하며 이러한 표면에서 반사가 잘 일어나지 않으면서 효율이 증가하는 것을 확인하였다.

• 한국전기전자재료학회논문지
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• 제33권1호
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• pp.10-15
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• 2020

Recently, with the increase in the use of urban solar power, solar modules are required to produce high power in limited areas. In this report, we proposed the fabrication of a high-power photovoltaic module using shingles technology, and developed accurate string characteristic simulations based on circuit modeling. By comparing the resistance components between the interconnected cells and the cell strips, the ECA resistance was determined to be 0.003 Ω. Based on the equivalent circuit of the modeled shingled string, string simulation was performed according to the type of cell strip. As a result, it was determined that the cell efficiency of the 4-cell strip was the highest at 19.66%, but the efficiency of the string simulated with the 6-cell strip was the highest at 20.48% in the string unit.

• Current Photovoltaic Research
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• 제1권2호
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• pp.73-81
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• 2013

Heterojunction with Intrinsic Thin-layer (HIT) solar cells are currently an important subject in industrial trends for thinner solar cell wafers due to the low-temperature of production processes, which is around $200^{\circ}C$, and due to their high-efficiency of 24.7%, as reported by the Panasonic (Sanyo) group. The use of thinner wafers and the enhancement of cell performance with fabrication at low temperature have been special interests of the researchers. The fundamental understanding of the band bending structures, choice of materials, fabrication process, and nano-scale characterization methods to provide necessary understanding of the interface passivation mechanisms, emitter properties, and requirements for transparent oxide conductive layers is presented in this review. This information should be used for the performance characterization of the developing technologies for HIT solar cells.