• Title/Summary/Keyword: High-transmittance film

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Effect of Doping Amounts of Al2O3 and Discharge Power on the Electrical Properties of ZnO Transparent Conducting Films (ZnO 투명 전도막의 전기적 특성에 미치는 Al2O3 의 도핑 농도 및 방전전력의 효과)

  • Park Min-Woo;Park Kang-Il;Kim Byung-Sub;Lee Se-Jong;Kwak Dong-Joo
    • Korean Journal of Materials Research
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    • v.14 no.5
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    • pp.328-333
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    • 2004
  • Transparent ZnO:Al conductor films for the optoelectronic devices were deposited by using the capacitively coupled DC magnetron sputtering method. The effect of Al doping concentration and discharge power on the electrical and optical properties of the films was studied. The film resistivity of $8.5${\times}$10^{-4}$ $\Omega$-cm was obtained at the discharge power of 40 W with the ZnO target doped with 2 wt% $Al_2$$_O3$. The transmittance of the 840 nm thick film was 91.7% in the visible waves. Increasing doping concentration of 3 wt% $Al_2$$O_3$ in ZnO target results in significant decrease of film resistivity, which may be due to the formation of $Al_2$$O_3$ particles in the as-deposited ZnO:Al film and the reduced ZnO grain sizes. Increasing DC power from 40 to 60 W increases deposition rate by more than 50%, but can induce high defect density in the film, resulting in higher film resistivity.

Preparation and Polarization Properties of Poly(vinyl alcohol) Polarizing Film Using the Mixed System of Supercritical $CO_2$/Organic Solvents/Dichroic Dye (초임계 탄산가스/유기용매/이색성 염료의 혼합계를 이용한 폴리(비닐 알코올) 편광필름의 제조 및 편광특성)

  • Park, Ki-Sang;Choi, E-Joon;Chang, Jin-Ho;Park, Il-Hyun
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.458-466
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    • 2011
  • In the mixed system of supercritical carbon dioxide/organic solvents, poly(vinyl alcohol)(PVA) film of high degree of hydrolysis could be dyed with a dichroic dye of C. I. direct black 22(DB22) and as a result, high durability was obtained. Especially, as a dye dispersant in a supercritical fluid phase, a mixed solvent system of ethylene glycol: dimethyl sulfoxide=4 : 6 weight ratio was investigated. Then the optimum pressure for dyeing could be reduced down to 200 bar. Using this supercritical fluid system, the maximum dyeing appeared as the transmittance of less than 1% and the waste amount was reduced to the level of 1/10. After 500% drawing of this PVA film, both the polarizing efficiency of 94% and the single piece transmittance of 30% were obtained. The limitation of DB22 and further improvements were also discussed.

Dependence on the Oxygen Gas of ITO Thin film for TOLED by Facing Targets Sputtering Method (대향타겟식 스퍼터링법을 이용한 TOLED용 ITO 박막의 산소 가스 의존성)

  • Keum Min-Jong;Kim Kyung-Hwan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.1
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    • pp.87-90
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    • 2006
  • In case of preparation of ITO thin film for using top electrode of Top-emitting Organic Light Emitting Diodes(TOLEDs), the ITO thin film should be prepared at room temperature and low oxygen gas flow condition in order to reduced the damage of organic layer due to the bombardment of highly energetic particles such as negative oxygen ions which accrued from the plasma. In this study, the ITO thin film with high optical transmittance and low resistivity prepared as a function of oxygen gas (0 ${\~}$ 0.8 sccm) and Ar gas was fixed at 20 sccm by the Facing Targets Sputtering (FTS) method. The electrical and optical properties of ITO thin films were measured by Hall effect measurement, UV/VIS spectrometer, respectively In the results, we obtained the ITO thin film with lowest resistivity($3{\times}10^{-4} {\Omega}{\cdot} cm$) at oxygen gas flow 0.2 sccm and optical transmittance over $80\%$ at oxygen gas flow over 0.2 sccm.

Optimal design of optical compensation film to improve viewing angle characteristics of OCB TFT-LCDs (OCB TFT-LCD의 시야각 특성 개선을 위한 보상필름 최적화 설계)

  • Yang, Dong-Min;Park, Woo-Sang
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.853-856
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    • 2005
  • we proposed the optimized conditions of the uniaxial and biaxial compensation films to suppress the light leakage to improve viewing angle characteristics. Compared with conventional OCB mode, the maximum transmittance is increased about 30% and the minimum transmittance is slightly decreased. From here results, we can about OCB mode with wide viewing angle and high contrast ratio.

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Optical Properties of VO2 Thin Film Deposited on F:SnO2 Substrate for Smart Window Application (스마트윈도우 응용을 위한 FTO 기판 위에 증착된 VO2 박막의 광학적 특성)

  • Kang, So Hee;Han, Seung Ho;Park, Seung Jun;Kim, Hyeongkeun;Yang, Woo Seok
    • Korean Journal of Materials Research
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    • v.23 no.4
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    • pp.215-218
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    • 2013
  • Vanadium dioxide ($VO_2$) is an attractive material for smart window applications where the transmittance of light can be automatically modulated from a transparent state to an opaque state at the critical temperature of ${\sim}68^{\circ}C$. Meanwhile, F : $SnO_2$ (F-doped $SnO_2$, FTO) glass is a transparent conductive oxide material that is widely used in solar-energy-related applications because of its excellent optical and electrical properties. Relatively high transmittance and low emissivity have been obtained for FTO-coated glasses. Tunable transmittance corresponding to ambient temperature and low emissivity can be expected from $VO_2$ films deposited onto FTO glasses. In this study, FTO glasses were applied for the deposition of $VO_2$ thin films by pulsed DC magnetron sputtering. $VO_2$ thin films were also deposited on a Pyrex substrate for comparison. To decrease the phase transition temperature of $VO_2$, tungsten-doped $VO_2$ films were also deposited onto FTO glasses. The visible transmittance of $VO_2$/FTO was higher than that of $VO_2$/pyrex due to the increased crystallinity of the $VO_2$ thin film deposited on FTO and decreased interface reflection. Although the solar transmittance modulation of $VO_2$/FTO was lower than that of $VO_2$/pyrex, room temperature solar transmittance of $VO_2$/FTO was lower than that of $VO_2$/pyrex, which is advantageous for reflecting solar heat energy in summer.

Transparent Dielectric Layer for PDP by Dry Film Method

  • Park, Lee-Soon;Ji, Ho-Chan;Chung, Chang-Beom
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.826-828
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    • 2003
  • With a new PDP transparent dielectric layer formation technique, we were able to make dielectric layer with high transmittance by using dry film type dielectric material. We optimized dielectric pastes for dry film and they showed good process properties in lamination , drying and firing.

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Design and Fabrication of Information Security Films with Microlouver Pattern and ZnO Nano-Ink Filling

  • Kim, Gwan Hyeon;Kim, So Won;Lee, Seong Eui;Lee, Hee Chul
    • Journal of the Korean Ceramic Society
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    • v.56 no.4
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    • pp.354-359
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    • 2019
  • Information security films that can ensure personal privacy by reducing the viewing angle of display screens were fabricated by microlouver patterning and a ZnO nano-ink filling process. Optical simulation results demonstrated that all the microlouver films showed good security performances. Security performances were evaluated as calculated relative luminance ratios compared between the side and front. Based on the simulation results, microlouver films were fabricated by UV imprint lithography and nano-ink bar coating. However, distortion of the microlouver pattern occurred with the use of high-viscosity nano-inks such as ZrO2 and TiO2, and the CuO-filled microlouver film suffered from very low optical transmittance. Accordingly, the effects of ZnO filling height on security performance were intensively investigated through simulation and experimental measurements. The fabricated microlouver film with a 75-㎛-high ZnO filling exhibited a good relative luminance ratio of 0.75 at a 60° side angle and a transmittance of 44% at a wavelength of 550 nm.

Mechanical Stability Evaluation of Thin Film with Spin-coater (스핀코터를 이용한 박막의 기계적 안정성 평가)

  • Kim, Ji Eun;Kim, Jung Hwan;Hong, Seongchul;Cho, HanKu;Ahn, Jinho
    • Journal of the Semiconductor & Display Technology
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    • v.15 no.1
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    • pp.6-11
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    • 2016
  • For high volume manufacturing using extreme ultraviolet (EUV) lithography, mask protection from contamination during lithography process must be solved, and EUV pellicle is the strongest solution. Based on the technical requirements of EUV pellicle, EUV pellicle should have large membrane area ($110{\times}140mm^2$) with film transmittance over 90% and mechanical stability. Even though pellicle that satisfies size standard with high transmittance has been reported, its mechanical stability has not been confirmed, nor is there a standard to evaluate the mechanical stability. In this study, we suggest a rather simple method evaluating mechanical stability of pellicle membrane using spin-coater which can emulate the linear accelerated motion. The test conditions were designed by simulating the acceleration distribution inside pellicle membrane through correlating the linear acceleration and centripetal acceleration, which occurs during linear movement and rotation movement, respectively. By these simulation results, we confirmed the possibility of using spin-coater to evaluate the mechanical stability of EUV pellicle.

A Review of Wet Chemical Etching of Glasses in Hydrofluoric Acid based Solution for Thin Film Silicon Solar Cell Application

  • Park, Hyeongsik;Cho, Jae Hyun;Jung, Jun Hee;Duy, Pham Phong;Le, Anh Huy Tuan;Yi, Junsin
    • Current Photovoltaic Research
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    • v.5 no.3
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    • pp.75-82
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    • 2017
  • High efficiency thin film solar cells require an absorber layer with high absorption and low defect, a transparent conductive oxide (TCO) film with high transmittance of over 80% and a high conductivity. Furthermore, light can be captured through the glass substrate and sent to the light absorbing layer to improve the efficiency. In this paper, morphology formation on the surface of glass substrate was investigated by using HF, mainly classified as random etching and periodic etching. We discussed about the etch mechanism, etch rate and hard mask materials, and periodic light trapping structure.

Enhanced Properties of IZO Thin Film Prepared by Nano-Powder Target

  • Ji, Seung-Hun;Youn, Hyun-Oh;Seo, Sung-Bo;Kim, Mi-Sun;Sohn, Sun-Young;Kim, Jong-Jae;Kim, Hwa-Min
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1428-1429
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    • 2009
  • Compared to the indium zinc oxide (IZO) film fabricated by micro-powder target, the IZO film with nano-powder target exhibited improved optoelectronic properties of wide bandgap, high transmittance, surface uniformity, and low sheet resistance due to the high film density.

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