• Title/Summary/Keyword: 전기 마이크로미터

Search Result 35, Processing Time 0.022 seconds

Buckling Formation on Steel-Based Solar Cell Induced by Silicone Resin Coat and Its Improvement on Performance Efficiency (실리콘 고분자 수지의 버클링을 통한 스틸기반 태양전지의 효율 향상)

  • Park, Young Jun;Oh, Kyeongseok
    • Korean Chemical Engineering Research
    • /
    • v.57 no.4
    • /
    • pp.519-524
    • /
    • 2019
  • Even though stainless steel foil is not a highly efficient material for film-type solar cell, it has strong passivation capability without additional process. In this study, silicone resin was employed during a-Si:H thin film solar cell fabrication for the purpose of planarization and electrical insulation. In the first stage of process, silicone resin was coat onto the stainless steel (STS) using spin coater with thickness of $2{\sim}3{\mu}m$ and followed by aluminum deposition using ion beam application. Unexpectedly buckling was formed during aluminum deposition process. After subsequent fabrication processes, solar cell performance was evaluated. In voltage-current data, slight increase of cell performance was obtained and interpreted by the increase of light scattering.

Fabrication of Organic-Inorganic Nanocomposite Blade for Dicing Semiconductor Wafer (반도체 웨이퍼 다이싱용 나노 복합재료 블레이드의 제작)

  • Jang, Kyung-Soon;Kim, Tae-Woo;Min, Kyung-Yeol;Lee, Jeong-Ick;Lee, Kee-Sung
    • Composites Research
    • /
    • v.20 no.5
    • /
    • pp.49-55
    • /
    • 2007
  • Nanocomposite blade for dicing semiconductor wafer is investigated for micro/nano-device and micro/nano-fabrication. While metal blade has been used for dicing of silicon wafer, polymer composite blades are used for machining of quartz wafer in semiconductor and cellular phone industry in these days. Organic-inorganic material selection is important to provide the blade with machinability, electrical conductivity, strength, ductility and wear resistance. Maintaining constant thickness with micro-dimension during shaping is one of the important technologies fer machining micro/nano fabrication. In this study the fabrication of blade by wet processing of mixing conducting nano ceramic powder, abrasive powder phenol resin and polyimide has been investigated using an experimental approach in which the thickness differential as the primary design criterion. The effect of drying conduction and post pressure are investigated. As a result wet processing techniques reveal that reliable results are achievable with improved dimension tolerance.

Size measurement of electrosprayed droplets using shadowgraph visualization method (Shadowgraph 가시화 기법을 활용한 정전분무액적의 크기 측정)

  • Oh, Min-Jeong;Kim, Sung-Hyun;Lee, Myong-Hwa
    • Particle and aerosol research
    • /
    • v.13 no.4
    • /
    • pp.151-158
    • /
    • 2017
  • Electrostatic precipitator is widely used to remove particulate matters in indoor air and industrial flue gas due to low pressure drop and high collection efficiency. However, it has a low collection efficiency for the submicrometer sized particles. Electrospraying is a potential method to increase the particle charging efficiency, which results in increased collection efficiency. Although particle charging efficiency is highly dependent upon droplet size, the effective measuring method of the droplets is still uncertain. Tap water was electrosprayed in this study, and the images of electrosprayed droplets were taken with a high speed camera coupled with several visualization methods in order to measure the droplets size. The droplet size distribution was determined by an image processing with an image-J program. As a result, a droplet measured by a laser visualization, had a half size of that by a Xenon light visualization. In addition, the experimentally measured droplet sizes were a good agreement with the predicted values suggested by $Fern{\acute{a}}ndez$ de la Mora and Loscertales(1994).

Functionalized Graphene/Polyimide Nanocomposites under Different Thermal Imidization Temperatures (열 이미드화 온도에 따른 작용기화 그래핀/폴리이미드 나노복합재료)

  • Ju, Jieun;Chang, Jin-Hae
    • Polymer(Korea)
    • /
    • v.39 no.1
    • /
    • pp.88-98
    • /
    • 2015
  • 4-Amino-N-hexadecylbenzamide-graphene sheets (AHB-GSs), used in the preparation of the polyimide (PI) nanocomposite films, were synthesized by mixing a dispersion of graphite oxide with a solution of the ammonium salt of AHB. The atomic force microscope image of functionalized-GS on mica and a profile plot revealed the average thickness of AHB-GS to be ~3.21 nm. PI films were synthesized by reacting 4,4'-biphthalic anhydride and bis(4-aminophenyl) sulfide. PI nanocomposite films containing various contents of AHB-GS over the range of 0-10 wt% were synthesized using the solution intercalation method. The PI nanocomposite films under different thermal imidization temperatures, 250 and $350^{\circ}C$, were examined. The graphenes, for the most part, were well dispersed in the polymer matrix despite some agglomeration. However, micrometer-scale particles were not detected. The average thickness of the particles was <10 nm, as revealed from the transmission electron microscope images. Only a small amount of AHB-GS was required to improve the gas barrier, and electrical conductivity. In contrast, the glass transition and initial decomposition temperatures of the PI hybrid films continued to decrease with increasing content of AHB-GS up to 10 wt%. In general, the properties of the PI hybrid films heat treated at $350^{\circ}C$ were better than those of films heat treated at $250^{\circ}C$.

Hybrid Fabrication of Screen-printed Pb(Zr,Ti)O3 Thick Films Using a Sol-infiltration and Photosensitive Direct-patterning Technique (졸-침투와 감광성 직접-패턴 기술을 이용하여 스크린인쇄된 Pb(Zr,Ti)O3 후막의 하이브리드 제작)

  • Lee, J.-H.;Kim, T.S.;Park, H.-H.
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.22 no.4
    • /
    • pp.83-89
    • /
    • 2015
  • In this paper, we propose a fabrication technique for enhanced electrical properties of piezoelectric thick films with excellent patterning property using sol-infiltration and a direct-patterning process. To achieve the needs of high-density and direct-patterning at a low sintering temperature (< $850^{\circ}C$), a photosensitive lead zirconate titanate (PZT) solution was infiltrated into a screen-printed thick film. The direct-patterned PZT films were clearly formed on a locally screen-printed thick film, using a photomask and UV light. Because UV light is scattered in the screen-printed thick film of a porous powder-based structure, there are needs to optimize the photosensitive PZT sol infiltration process for obtaining the enhanced properties of PZT thick film. By optimizing the concentration of the photosensitive PZT sol, UV irradiation time, and solvent developing time, the hybrid films prepared with 0.35 M of PZT sol, 4 min of UV irradiation and 15 sec solvent developing time, showed a very dense with a large grain size at a low sintering temperature of $800^{\circ}C$. It also illustrated enhanced electrical properties (remnant polarization, $P_r$, and coercive field, $E_c$). The $P_r$ value was over four times higher than those of the screen-printed films. These films integrated on silicon wafer substrate could give a potential of applications in micro-sensors and -actuators.