• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.18 no.3
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• pp.199-205
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• 2005

Polycrystalline cadmium sulfide(CdS) thin films were deposited on glass substrate by chemical bath deposition(CBD) and vacuum evaporation (VE) techniques. VE-CdS films consisted primarily of hexagonal phase, whereas CBD CdS films containing primarily the cubic form. VE-grown films were shown to have better crystallinity than CBD-grown films. The grain size of the CBD films is smaller than the ones of VE films. VE-CdS films exhibited relatively high transmittance in the above-gap region and band gap compared with CBD films. However, CdTe solar cells with these low quality CBD-CdS layers yield higher and more stable characteristics. Current-voltage-temperature measurements showed that the current transport for both cells was controlled by both tunneling and interface recombination but the cells with CBD-CdS displayed less tunneling.

• Journal of the Semiconductor & Display Technology
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• v.12 no.1
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• pp.47-51
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• 2013

The screen printing is a process that is widely used in manufacturing process of various fields such as flexible devices, portable multimedia devices, OLED, and the solar cell. The screen printing method has been studied as a method for forming the high precision micro-pattern, making the low-cost manufacturing process and reducing cost through improvement of productivity. It is applicable to deposit and forming the pillars which are one of the core element for comprising vacuum glazing. In this paper, by using the paste of the glass frit base, the screen printing was performed. We analyzed the effect for the printing process to deposit pillar paste on the screen printing parameters by the factorial experimental design. The polynomial predicting the volume of the printed supporting pillars was drawn by using screen printing.

• Journal of Korean Vacuum Science & Technology
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• v.3 no.2
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• pp.101-106
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• 1999

The main consideration factor to design a magnetron of the sputtering system for TFT-LCD metallization is high sheet resistance (Rs) uniformity which is provided by the high target erosion and high current efficiency. The present study has developed a rectangular magnetron for TFT-LCD to bve considered full target erosion and high film uniformity. After an aluminum-2 at.% and alloy target was installed in a magnetron source and the film was deposited on the glass of 600${\times}$720 mm, the Rs uniformity of the deposited film was measured as functions of the magnet tilt and magnet scanning configuration. And the target erosion profile was observed with the target voltage. When sputtered at 4mtorr and 10kW, the magnet tilt for the high Rs uniformity of 8.38% was 7mm. The plasma voltage at the dwell home and end for full-face target erosion, when scanned the magnetron was 120% compared to the mean voltage of the other area.

• Journal of Korean Vacuum Science & Technology
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• v.6 no.1
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• pp.51-54
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• 2002

Polymer EL devices of glass/ITO/PI/MEH-PPV/Al structure were fabricated using spin coating and the Ionized Cluster Beam deposition technique. PMDA-ODA type thin polyimide films which can be used as a impurity blocking layer of EL device were deposited by ICB. According to our previous results, the packing densities of polyimide films were subject to change and depend on their deposition condition. By inserting a Pl layer with various thickness and packing density, I-V characteristics and life time of the devices were investigated to determine the role of a interlayer. The blocking of impurity diffusion from ITO to luminescent layer were confirmed by XPS.

• Journal of Korean Vacuum Science & Technology
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• v.6 no.3
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• pp.120-125
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• 2002

The aim of the present work is to optimized the annealing parameter in both front and back screen printed contacts realization on p-type multicrystalline silicon and with phosphorus diffused. The RTA treatments were carried out at various temperatures from 600 to 850$\^{C}$ and annealing time ranging from 3 min to 5 min in air, O$_2$and N$_2$ ambiance. The contacts parameters are obtained according to Transmission Line Model measurements. A good RTA cycle is obtained with a temperature plateau of 700$\^{C}$-750$\^{C}$ and annealing ambiance of air. Several processing parameters required for good cell efficiency are discussed with an emphasis placed on the critical role of the glass frit in the aluminum paste. A anamolus behaviour of Aluminum n-doping on p-type Si wafer, contact at high temperature have also been studied.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.10a
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• pp.33-37
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• 2002

Recently, composites have been widely applied in the sporting goods, automobile, aerospace industry. As the use of advanced composites increase, specific techniques have been developed to repair damaged composite structures. In order to repair the damaged part, it is required that the material in the damaged area be removed first by utilizing the proper method, and prepreg be laid up in the area and cured under vacuum using the vacuum bagging materials. In curing process, either in an oven or autoclave is to be delamination can be occurred in the sound areas during and/or after the exposure to the elevated curing temperature in case that the repair process is repeated. Therefore, this study was conducted to evaluate the degree of degradation of properties of the cured parts and how it affects to the delamination phenomenon between laminated skin and honeycomb core.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.258-258
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• 2010

ZnO TCO 박막은 후반사막과 전면전극의 물질으로써, 태양전지의 효율을 증가시킬수 있는 중요한 역할을 하고 있다. 특히 Boron 을 도핑한 BZO 박막은 가시광대 영역에서 높은 투명도를 보여준다. Soda Lime glass 위에 MOCVD를 이용하여 증착한 BZO 박막에 대해서, 플라즈마 처리에 의한 광학적 변화를 알아 보았다. 산소 또는 수소 분위기에서 플라즈마 처리를 하였고, 그에 따른 공정 조건 중 RF 전력, 압력, 시간을 제어했다. 이에 따라 ZnO 박막의 광학적 특성의 분석을 통해서 플라즈마 처리에 따른 흡수도와 밴드갭의 변화를 볼 수 있었다.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.252-252
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• 2010

AIZTO (Al-In-Sn-ZnO) thin film was deposited on glass substrate at room temperature by facing target sputtering (FTS) system. The FTS system was designed to array two targets facing each other. Two different kinds of targets were installed on FTS system. We used the ITO (In2O3 90wt%, SnO2 10wt%) target and the AZO (ZnO 98wt%, Al2O3 2wt%). AIZTO films were deposited in each of the applied power of the targets. The electrical and structural properties of the as-deposited AIZTO thin films were then examined by hall-effect measurement, and by using atomic force microscope (AFM), X-ray diffractometer (XRD), and energy dispersive x-ray spectroscopy (EDX). The optical property was measured by an UV-VIS spectrometer.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.329.1-329.1
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• 2014

In this paper, we report electrical, optical and structural properties of Al-doped zinc oxide (AZO) thin films deposited at different substrate temperatures and pressures. The films were prepared by radio frequency (RF) magnetron sputtering on glass substrates in argon (Ar) ambient. The X-ray diffraction analysis showed that the AZO films deposited at room temperature (RT) and 20 Pa were mostly oriented along a-axis with preferred orientation along (100) direction. There was an improvement in resistivity ($3.7{\times}10^{-3}{\Omega}-cm$) transmittance (95%) at constant substrate temperature (RT) and working pressure (20 Pa) using the Hall-effect measurement system and UV-vis spectroscopy, respectively. Our results have promising applications in low-cost transparent electronics, such as the thin-film solar cells and thin-film transistors due to favourable deposition conditions. Furthermore our film deposition method offers a procedure for preparing highly oriented (100) AZO films.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.339.2-339.2
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• 2014

터치패널은 저항막 방식, 정전용량 방식, 적외선방식, Camera방식 등을 사용하고 있으며 현재 널리 상용화 되어 있는 방식은 정전용량 방식이다. 최근 터치스크린의 면적이 점점 커지게 되면서 점차 저저항, 고투과율을 가지는 IM ITO (Index matching ITO)를 요구하고 있다. 본 연구에서는 중대형 사이즈(15inch 이상)의 Cover glass 일체형 터치센서 구현을 위한 저저항(60ohm/sq이하), 고투과(88% 이상)의 IMITO Glass를 제작하여 전기적,광학적 특성을 분석하여 IMITO 성막조건을 최적화시키는 연구를 하였다. 또한 TSP의 Pattern 시인성을 향상시키기 위해 Index matching층을 고굴절재료와 저굴절 재료를 사용한 다층박막을 형성하여 반사율(0.5% 이하)을 최소화시켜 구현하였다.