• 한국전기전자재료학회논문지
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• 제29권3호
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• pp.168-174
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• 2016

A conductive oxide-based sapphire glass indium tin oxide/metal electrode and the optical coating, through patterning process was studied in excellent optical properties and integrated touch panel has a high strength. Indium tin oxide conductive oxides of the sapphire glass to 0.3 A at DC magnetron sputtering method of 10 min, gas flow Ar 10 Sccm Ar, $O_2$ 1.0 Sccm the formation conditions of the thin film after annealing at $550^{\circ}C$ for 30min was achieved through a 86% transmittance. In addition, the coating 130 nm hollow silica sol-gel was to improve the optical transmittance of the indium tin oxide to 91%. For the measurement by the modeling hollow silica sol by Macleod simulation and calculated the average values of silica part to the presence or absence in analogy to actual. Refractive index value and the actual value of the material on the simulation the transmittance difference is it does not completely match the air region similar to the actual value (transmission) could be confirmed that the measurement is set to a value of between 5 nm and 10 nm.

• 한국정보전자통신기술학회논문지
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• 제13권4호
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• pp.293-297
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• 2020

본 논문은 multiplex deposition sputter system을 이용하여 ITO 유리에 CdS 박막을 증착하여 태양전지에 적용될 수 있는 가장 좋은 조건을 찾고자 하였다. RF power를 50W, 100W, 150W로 변화주었고 스퍼터링시간은 10분으로 하였다. 투과율을 측정한 결과, 400~800 nm 영역에서 평균 투과율은 60%에서 80% 까지 측정되었으며 150W일 때 84%로 가장 좋은 특성이 측정되었다. 또한 밴드갭은 50W일 때 3.762eV, 100W일 때 4.037eV, 150W일 때 4.052eV로 측정되었다. XRD 분석에서는 RF power가 증가하여도 CdS의 구조인 Wurtzite(hexagonal)로 관찰되었다. 그리고 RF power가 증가할수록 입자가 크고 균일하게 증착 되었나, 100W 일 때 입자들이 조밀하게 구성되었고 밀도가 크다는 것을 알 수 있었다. 그리고 두께 측정 결과 RF power 가 증가할수록 균일성 있게 증가되었다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
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• pp.560-568
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• 2000

The aims of this research were to investigate the preprocessing effect of spectrum data on prediction performance and to develop a robust model to predict SSC in intact apple. Spectrum data of 320 Fuji apples were measured with the on-line transmittance measurement system at the wavelength range of 550∼1100nm. Preprocess methods adopted for the tests were Savitzky Golay, MSC, SNV, first derivative and OSC. Several combinations of those methods were applied to the raw spectrum data set to investigate the relative effect of each method on the performance of the calibration model. PLS method was used to regress the preprocessed data set and the SSCs of samples, and the cross-validation was to select the optimal number of PLS factors. Smoothing and scattering corection were essential in increasing the prediction performance of PLS regression model and the OSC contributed to reduction of the number of PLS factors. The first derivative resulted in unfavorable effect on the prediction performance. MSC and SNV showed similar effect. A robust calibration model could be developed by the preprocessing combination of Savitzky Golay smoothing, MSC and OSC, which resulted in SEP= 0.507, bias=0.032 and R$^2$=0.8823.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.77-78
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• 2008

ZnO thin films were deposited on glass substrates by pulsed laser deposition (PLD) at various oxygen pressures. We observed structural, electrical and optical properties of ZnO films. Structural properties were analysed by XRD and FE-SEM. Electrical properties for applications of transparent thin film transistors (TTFTs) were measured by hall measurement using van der pauw methods at room temperature. In order to apply in transparent devices, we measured transmittance, and optical bandgap energy was calculated by Tauc's equation. The results showed that ZnO films deposited at 200mTorr oxygen pressure were applicable to channel layers of transparent TFTs. It had high hall mobilities ($52.92cm^2$/V-s) and suitable transmittance at visible wavelength region (above 80%).

• 통합자연과학논문집
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• 제11권2호
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• pp.113-120
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• 2018

This study was planned to prepare the high strength hydrogel ophthalmic lens containing isocyanate group and nanoparticles. HDI with carbon nanoparticles were used as additives for the basic combination of HEMA, MA and MMA, and the materials were copolymerized with EGDMA as the cross-linking agent and AIBN as the initiator. The mixture was heated at $100^{\circ}C$ for an hour to produce the high performance hydrogel ophthalmic lens by cast mold method. Measurement of the physical characteristics of the produced material showed that the refractive index was in the range of 1.4027~1.4600, water content 25.21~44.01%, contact angle $54.18{\sim}72.94^{\circ}$, visible light transmittance 53.03~92.09%, and tensile strength 0.1024~0.2359 kgf and breaking strength was 0.0872~0.2825 kgf. The results showed an increase of refractive index while the decrease in water content. And also, the breaking strength was highest when the addition ratio of HDI was 5%(wt). As a result of the absorbance measurement, no significant difference was observed in all the samples, so it can be judged that the stabilization of nanoparticles in the polymer was maintained.

• Transactions on Electrical and Electronic Materials
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• 제13권5호
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• pp.241-244
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• 2012

Antimony doped tin oxide (ATO) thin films on glass substrate were prepared by the chemical solution deposition (CSD) method, using sol-gel solution synthesized by non-alkoxide precursors and the sol-gel route. The crystallinity and electrical properties of ATO thin films were investigated as a function of the annealing condition (both annealing environments and temperatures), and antimony (Sb) doping concentration. Electrical resistivity, carrier concentration, Hall mobility and optical transmittance of ATO thin films were improved by Sb doping up to 5~8 mol% and annealing in a low vacuum atmosphere, compared to the undoped tin oxide counterpart. 5 mol% Sb doped ATO film annealed at $550^{\circ}C$ in a low vacuum atmosphere showed the highest electrical properties, with electrical resistivity of about $8{\sim}10{\times}10^{-3}{\Omega}{\cdot}cm$, and optical transmittance of ~85% in the visible range. Our research demonstrates the feasibility of low-cost solution-processed transparent conductive oxide thin films, by controlling the appropriate doping concentration and annealing conditions.

• 분석과학
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• 제7권1호
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• pp.17-23
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• 1994

졸-겔법에 의해 dye host로 사용될 수 있는 무기/유기 복합체(ORMOSIL)를 제조하였으며, 이 복합체가 dye host로 적합한 조건을 갖췄음을 UV/VIS Spectrophotometer를 이용하여 90% 정도의 투광성을 얻음으로써 알 수 있었다. 이 투광성은 졸-겔 공정 중 촉매로 쓰이는 염산의 양이 적고 묵힘시간이 짧을수록 커짐을 알 수 있었다. 또한 이렇게 제조된 Host에 Rhodamine 6G Perchlorate를 도핑하여 유기염료의 형광 및 투광성을 측정한 결과 겔화온도가 증가될수록 형광 강도가 증가하며 투광성은 감소하는 것을 관찰할 수 있었다.

• 통합자연과학논문집
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• 제9권4호
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• pp.249-254
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• 2016

This study evaluated the physical and optical characteristics of hydrophilic ophthalmic polymer with addition of 2-methacryloyloxyethyl phosphorylcholine in the basic hydrogel ophthalmic lens material, and in particular, the utility of 2-methacryloyloxyethyl phosphorylcholine as an ophthalmic contact lens material for ophthalmologic devices was investigated. In this study 2-methacryloyloxyethyl phosphorylcholine were used as additives. For the preparation of hydrogel lens 2-hydroxyethyl methacrylate, methyl methacrylate, acrylic acid and a cross-linker EGDMA were copolymerized in the presence of AIBN as an initiator. The physical properties of the produced polymers were measured as followings. The refractive index of 1.433~1.393, water content of 35.95~53.16%, contact angle of $70.6{\sim}51.24^{\circ}$, UVB transmittance of 81.2~82.4%, UV-B transmittance of 81.2~82.4% and visible transmittance of 91.4~92.2% were obtained. Also, in case of protein absorption, the measurement showed that absorbance of Reference and MPC-10 sample was 0.2598 and 0.2250 respectively. Based on the results of this study, ophthalmic lens material containing 2-methacryloyloxyethyl phosphorylcholine is expected to be used usefully as a material for high wettability and inhibitor of protein adsorption for ophthalmic hydrogel lens.

• 공업화학
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• 제29권4호
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• pp.484-487
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• 2018

본 논문에서는 유기전자소자에서 사용되는 수분 차단막의 투습도 분석을 위하여 ytterbium의 광학적 전기적 특성을 연구하였다. Ytterbium 박막은 다양한 성막 두께(20-100 nm)에 따라 넓은 범위의 광투과도(70-10%)와 비저항($6.0-0.16m{\Omega}{\cdot}cm$) 값을 나타내었다. 25 nm의 ytterbium 박막은 수분과 반응하여 산화되며 투과도와 저항이 실시간으로 변화하였고 이를 통해 parylene 고분자와 aluminum nitride 적층형 박막 봉지 필름을 분석한 결과 $4.3{\times}10^{-3}g/m^2{\cdot}day$의 투습도를 측정할 수 있었다.

• 한국전기전자재료학회논문지
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• 제17권11호
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• pp.1230-1233
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• 2004

The ITO thin films were prepared by the FTS(Facing Targets Sputtering) system. The ITO thin films are deposited by changing the input current and working gas pressure. Then, electric characteristics, transmittance and surface roughness of ITO thin films were measured by Hall effect measurement, UV-VIS spectrometer and AFM. As a result, the ITO thin film was fabricated with resistivity 6xl0$^{-4}$ Ωㆍcm, carrier mobility 52.11 $\textrm{cm}^2$/Vㆍsec, carrier concentration 1.72 x $10^{20}$ $cm^{-3}$ transmittance over 85 % of ITO film at working gas pressure 1 mTorr and input current 0.6 A.