• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.58.1-58.1
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• 2010

Stainless Steel의 유연한 기판을 사용하여 ZnO:Al/Ag의 후면전극에서 Ag 증착 실험조건 변화를 통해서 light trapping을 개선한 n-i-p 구조의 플렉서블 미세결정질 실리콘 박막 태양전지를 제작하였다. 실험 방법으로 마그네트론 스퍼터를 사용하여 Stainless Steel 기판 위에 ZnO:Al/Ag를 증착하여 후면전극으로 사용되는 back reflector를 제작하였으며 그 위에 미세결정질 실리콘 박막을 증착하였다. Back reflector에서 Ag 박막의 증착 온도가 증가할수록 표면결정 성장으로 roughness가 증가하여 반사도를 증가하였다. 또한, Ag 박막 증착 두께와 압력 변화에 따른 광학적 특성변화를 Atomic Force Microscope(AFM), Scanning Electron Microscopy(SEM),UV-visible-nIR spectrometry로 조사하여 최적의 조건을 찾았으며 개선된 back reflector의 특성이 n-i-p 구조의 플렉서블 미세결정질 실리콘 박막 태양전지에 적용하여 light trapping의 증가가 태양전지에서 광학적인 특성 변화 및 효율 향상에 영향을 주는지 Photo IV와 EQE(External Quantum Efficiency)를 통하여 조사하였다.

• Journal of the Korean Electrochemical Society
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• v.6 no.1
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• pp.53-58
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• 2003

It is well known that the anode substrate of anode-supported type SOFC should have high electrical conductivity and high gas permeability to minimize the polarization loss of the cell performance during operation. In this study, we made anode substrates of SOFC with two different methods, which gave different anode microstructures, especially different pore structures with each other. We performed electrical and microstructural characterization of Ni/YSZ cermet anode via extensive measurements of its electrical conductivity and gas permeability combined with adequate image analysis based on quantitative stereological theory

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.21-21
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• 2009

후막 광식각 기술을 이용하여 형성된 Ag 전극과 LTCC 기판 사이의 접착력을 향상시키기 위하여 무기 바인더로서 anorthite, diopside 및 MLS-62 glass frit을 첨가하여 감광성 Ag paste를 제조하였다. 소성 후의 glass pool effect를 감소시키기 위해 attrition mill을 통하여 미세 glass 분말을 준비하였다. Glass frit은 Ag powder의 5vol%~25vol%의 함량으로 첨가하여 감광성 Ag paste를 제조하였고 패턴 형성 후 $850^{\circ}C$에서 1시간 소결하였다. 전극과 기판 사이의 접착력은 micro-ball shear test 법으로 측정하였으며, Ag 전극 부착력은 glass frit의 함량 증가에 따라 증가하다가 감소하는 경향을 보이는데, 이는 과량의 glass frit 첨가로 인한 전극 내부에 액상 풀의 형성에 기인한 것으로 보여진다. Ag 전극의 면저항은 glass frit의 함량이 증가함에 따라 $0.13m{\Omega}{/\square}$에서 $2.06m{\Omega}{/\square}$까지 증가하는 경향을 나타내었다. 소성 전후의 전극 패턴의-수축율은 $100{\mu}m$의 선폭을 기준으로 glass frit의 첨가랑이 증가할수록 43.3%에서 35.0%로 감소하였으며, 그 결과 최소 선폭 $25{\mu}m$의 미세 전극 패턴의 형성이 가능하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.475-480
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• 2017

In this paper, the conductivity of the fine pattern is improved in the insulating substrate by laser-induced forward transfer (LIFT) process. The high laser beam energy generated in conventional laser induced deposition processes induces problems such as low deposition density and oxidation of micro-patterns. These problems were improved by using a polymer coating layer for improved deposition accuracy and conductivity. Chromium and copper were used to deposit micro-patterns on silicon wafers. A multi-pulse laser beam was irradiated on a metal thin film to form a seed layer on an insulating substrate(SiO2) and electroless plating was applied on the seed layer to form a micro-pattern and structure. Irradiating the laser beam with multiple scanning method revealed that the energy of the laser beam improved the deposition density and the surface quality of the deposition layer and that the electric conductivity can be used as the microelectrode pattern. Measuring the resistivity after depositing the microelectrode by using the laser direct drawing method and electroless plating indicated that the resistivity of the microelectrode pattern was $6.4{\Omega}$, the resistance after plating was $2.6{\Omega}$, and the surface texture of the microelectrode pattern was uniformly deposited. Because the surface texture was uniform and densely deposited, the electrical conductivity was improved about three fold.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.258-258
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• 2004

전해 가공은 공작물의 기계적 특성과 무관하게, 빠른 속도로 가공할 수 있는 장점이 있으나, 가공 간극이 비교적 넓어 초정밀 가공에는 널리 적용되지 못했다. 최근 Schuster는 초단 펄스를 이용한 전해 가공으로 가공 간극을 수 $\mu\textrm{m}$ 까지 줄일 수 있고 미세 3차원 구조물의 정밀가공에 초단 펄스를 적용할 수 있음을 보였다. 본 논문에서는 초단 펄스를 이용한 미세 흠의 와이어 전해 가공에 대하여 연구하였다. 전극으로는 지름 10$\mu\textrm{m}$ 백금 와이어를 사용하였으며 공작물은 스테인리스 스틸을 사용하였다.(중략)

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1326-1327
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• 2011

결정질 태양전지 제작 시 실리콘 기판 표면의 전극형성은 주로 스크린 프린트를 이용하여 형성되고 있다. 이는 squeeze 와 실리콘 기판과의 직접 접촉으로 인하여 기판의 파손이 야기 될 수 있으며, 보다 미세한 전극 형성이 어려운 단점이 있다. 본 연구에서는 비접촉식 잉크젯 프린팅을 이용한 태양전지의 전극형성에 관하여 기술하였으며, 고효율 태양전지를 제작하기 위해 레이저를 이용한 grooving 형성과 전극의 패턴에 따른 반사방지막층 제거를 통하여 Buried contact cell 제작을 연구하였다. 이를 통해 전극의 선 폭을 $45{\mu}m$로 구현하였으며, 나노 크기의 입자 형태를 띤 Ag 잉크를 이용하여 인쇄하였다.

• Journal of the Korean Electrochemical Society
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• v.27 no.1
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• pp.32-39
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• 2024

The key components of a Phosphoric acid fuel cell (PAFC) are an electrode catalyst, an electrolyte matrix and a gas diffusion layer (GDL). In this study, we introduced a microporous layer on the GDL of PAFC to enhance liquid electrolyte management and overall electrochemical performance of PAFC. MPL is primarily used in polymer electrolyte membrane fuel cells to serve as an intermediate buffer layer, effectively managing water within the electrode and reducing contact resistance. In this study, electrodes were fabricated using GDLs with and without MPL to examine the influence of MPL on the performance of PAFC. Internal resistance and polarization curves of the unit cell were measured and compared to each other to assess the impact of MPL on PAFC electrode performance. As the results, the application of MPL improved power density from 170.2 to 192.1 mW/cm². MPL effectively managed electrolyte and water within the matrix and electrode, enhancing stability. Furthermore, the application of MPL reduced internal resistance in the electrode, resulting in sustained and stable performance even during long-term operation.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.48 no.6
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• pp.7-14
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• 2011

This paper is related to a roll-type micro-contact printing process. The proper parameters such as coating velocity, inking velocity, printing velocity and printing pressure as well as Ag contents of Ag ink were extracted to perform the fine patterning of Ag electrodes. Additionally we developed a process for PDMS with high uniform thickness. Finally, we obtained the Ag fine electrodes on $4.5cm\;{\times}\;4.5cm$ plastic substrate with the line width of 10 um, thickness less than 300 nm, surface roughness less than 40 nm, and the specific resistance of $2.08\;{\times}\;10^{-5}{\Omega}{\cdot}cm$.

• Polymer(Korea)
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• v.27 no.1
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• pp.46-51
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• 2003

In this work, the electrode far fuel cell was fabricated by mixing carbon blacks with activated carbon fibers (ACFs) in order to form the proper three phase distribution, and then the change of electrode in three phase distribution was investigated. Pt loading yield with ACF content and Pt particle size were determined by AAS and XRD measurements, respectively. And the pore structures, including specific surface area ($S_{BET}$), microporosity, and pore size distribution (PSD) for each electrode were systematically investigated by BET volumetric measurement. The morphology of electrode in three phase distribution was determined by SEM. As an experimental result, it was observed that Pt loading yield was not influenced on the content of ACF. While, the electrode in three phase distribution was largely improved in the case of 30% ACF addition on carbon blacks. These results were probably explained by the increase of the portion of micropores, resulting in increasing the active sites of catalyst.

• 한국전기화학회:학술대회논문집
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• 2001.04a
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• pp.9-9
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• 2001