• 제목/요약/키워드: doctor blade

검색결과 79건 처리시간 0.024초

비진공 나노입자 코팅법을 이용한 CIGS 박막 태양전지 제조 (Fabrication of CIGS Thin Film Solar Cell by Non-Vacuum Nanoparticle Deposition Technique)

  • 안세진;김기현;윤경훈
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 춘계학술대회
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    • pp.222-224
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    • 2006
  • A non-vacuum process for $Cu(In,Ga)Se_2$ (CIGS) thin film solar cells from nanoparticle precursors was described in this work CIGS nanoparticle precursors was prepared by a low temperature colloidal route by reacting the starting materials $(CuI,\;InI_3,\;GaI_3\;and\;Na_2Se)$ in organic solvents, by which fine CIGS nanoparticles of about 20nm in diameter were obtained. The nanoparticle precursors were mixed with organic binder material for the rheology of the mixture to be adjusted for the doctor blade method. After depositing the mixture of CIGS with binder on Mo/glass substrate, the samples were preheated on the hot plate in air to evaporate remaining solvents ud to burn the organic binder material. Subsequently, the resultant (porous) CIGS/Mo/glass simple was selenized in a two-zone Rapid Thermal Process (RTP) furnace in order to get a solar ceil applicable dense CIGS absorber layer. Complete solar cell structure was obtained by depositing. The other layers including CdS buffer layer, ZnO window layer and Al electrodes by conventional methods. The resultant solar cell showed a conversion efficiency of 0.5%.

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비용 효율적인 유연 디스플레이용 무색 투명 폴리이미드 필름 제작 (Cost-efficient Fabrication of Colorless and Optically Transparent Polyimide Film for Flexible Displays )

  • 조다운;김지호;오충석
    • 반도체디스플레이기술학회지
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    • 제22권1호
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    • pp.33-38
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    • 2023
  • As the demand for large flexible displays such as tablet computers continues to rise, there is an increasing need for cost-efficient colorless and optically transparent polyimide film that can meet the desired performance, particularly optical transmittance. In this study, we investigated a detailed procedure for achieving optimal optical transmittance using two different combinations of monomers: 6FDA+BAPB and 6FDA+BPA+TFDB. We employed a design of experiment method to systematically synthesize polymers, allowing for the optimization of optical transmittance. In addition, we were able to achieve uniform thickness in the films by using a doctor blade. By comparing the price and optical transmittance of four different monomer combinations, we obtained fundamental data on the production of polyimide films that can be customized to meet the specific price and performance requirements of manufacturers. This approach enables users to select the most suitable polyimide film based on their desired price and performance parameters while achieving optimal optical transmittance.

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전극의 두께와 소성 온도에 따른 DSSC의 효율 특성 (DSSC Efficiency Characteristics by Annealing Temperature and Thickness of Electrodes)

  • 황기섭;하기룡
    • 공업화학
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    • 제21권4호
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    • pp.405-410
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    • 2010
  • P25와 Dyesol $TiO_2$ (Titanium dioxide)를 사용하여 두께와 소성 온도가 다른 전극을 제조하여 염료감응형 태양전지(Dye Sensitized Solar Cell, DSSC)를 제조한 후 광 변환 효율을 측정하였다. 소성 전 후의 $TiO_2$ 작업 전극의 두께 변화는 FE-SEM을 사용하여 시편의 cross section을 확인하여 비교하였다. 또한 상대전극인 Pt의 소성 온도에 따른 DSSC의 효율 변화도 측정하였다. P25를 활용한 DSSC는 doctor blade로 1층으로 도포 후, $500^{\circ}C$에서 30 min 동안 소성한 작업 전극(${\sim}20.4{\mu}m$)과 $350^{\circ}C$에서 30 min 동안 소성한 Pt 상대 전극으로 제조한 셀이 3.8%의 광효율을 나타내었다. Dyesol $TiO_2$를 활용하여 1층으로 도포 후, $500^{\circ}C$에서 30 min 동안 소성한 작업전극(${\sim}9.1\;{\mu}m$)과 $450^{\circ}C$에서 30 min 동안 소성한 Pt 상대 전극으로 제조한 셀이 5.8%의 광 효율을 나타냄을 알았다.

유기발포제에 따른 적층형 PTC(Positive Temperature Coefficient of Resistance) 써미스터의 전기적 특성 (Electric Properties of the Laminate Type PTC(Positive Temperature Coefficient of Resistance) Thermistor According to Polymer Blowing Agent)

  • 이미재;황종희;김진호;임태영
    • 한국재료학회지
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    • 제22권12호
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    • pp.658-663
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    • 2012
  • The electrical properties of a laminated SMD type PTC thermistor for microcircuit protection were investigated as a function of polymer blowing agent addition. Green ceramics for multilayered $BaTiO_3$-based PTCRs were formed by doctor blade method of barium titanate powders; we successfully laminated the sintered ceramic chips to obtain 10 layer chip PTCRs with PTC effect. The sintered density increases with increasing sintering temperature. The electrical properties of the sintered samples were strongly dependent on the calcination and addition of a polymer blowing agent. When $BaTiO_3$ powders containing 0.2 mol% of $Y_2O_3$ were calcined at $1000^{\circ}C$ for 2 hrs, the resistivity jump was of 1-2 orders of magnitude. The resistivity at room temperature increases according to the polymer blowing agent addition. Also, the sample using the calcined powder showed a lower resistivity than that of the sample prepared using powders without calcinations. With an increase in the OBSH, the magnitude of the resistivity jumped as a function of the temperature increase. The resistivity of the sintered bodies after the addition of 0.5 wt% polymer blowing agent at $1290^{\circ}C$ for 2 h was shown to be about $8.5{\Omega}{\cdot}cm$; the jump order of the sintered bodies was shown to be on the order of $10^2$.

Improved Power Conversion Efficiency of Dye-Sensitized Solar Cells Assisted with phosphor materials Scattering layer

  • Lee, Yong-Min;Choi, Hyun Ji;Kim, Dong In;Lee, Yul Hee;Yu, Jung-Hoon;Kim, Jee Yun;Seo, Hyeon Jin;Hwang, Ki-Hwan;Nam, Sang Hun;Boo, Jin-Hyo
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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    • pp.408.2-409
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    • 2016
  • Theoretically, the dye-sensitized solar cells (DSSCs) are high efficiency solar cells. However DSSCs have low power conversion efficiency (PCE) than silicon based solar cells. In this study, we use the phosphor materials, such as $Y_2O_3:Eu$ (Red), $Zn_2SiO_4:Mn$ (Green), $BaMgAl_{14}O_{23}:Eu$ (Blue), to enhance the PCE of DSSCs. Three phosphors were prepared and used as an effective scattering layer on the transparent $TiO_2$ with doctor blade method. We confirmed that the three scattering layers improve the PCE and Jsc due to the light harvesting enhancement via increased the scattering and absorbance in visible range. Under the sun illumination AM 1.5 conditions, the PCE of the mesoporous $TiO_2$ based DSSCs is 5.18 %. The PCE of the DSSCs with Y2O3:Eu, $Zn_2SiO_4:Mn$ and $BaMgAl_{14}O_{23}:Eu$ as scattering layer were enhanced to 5.66 %, 5.72% and 5.82%, respectably. In order to compare the optical properties change, DSSCs were measured by EQE, reflectance and PCE. At the same time, FE-SEM and XRD were used to confirm the structural changes of each layer.

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잘게 저민 생선의 드럼건조기에 의한 건조특성 (Drying Characteristics of Minced Fish on Drum Dryers)

  • 김공환;와차린피아랏
    • 한국식품과학회지
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    • 제18권5호
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    • pp.351-356
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    • 1986
  • 단(單)원통형 및 원통형 드럼건조기를 이용하여 잘게 저민 생선으로부터 플레이크를 성공적으로 만들 수 있었다. 생선의 높은 지방함량으로 인해 저민 생선이 드럼에 잘 들러붙지 않는 문제점은 타피오카가루의 형태로 2.5%의 전분을 저민 생선에 첨가함으로서 건조양상에는 영향을 미치지 않으면서 해결될 수 있었다. 제품의 수분함량을 일정한 수준으로 유지할 경우 건고형분(乾固形分)의 생산속도는 드럼간의 간격을 최소로 줄였을때 최고에 도달하였다. 건고형분(乾固形分)의 생산속도는 드럼의 회전속도가 증가할수록 선형적으로 증가하였고 제품의 품질이 손상되지 않는 범위에서 스팀의 압력이 높을수록 증가하였다. 총괄 열전달계수는 드럼의 회전수가 증가함에 따라 증가한 반면에 드럼간의 간격이 커짐에 따라 증가하지는 않았다. $MR\;=\;A\;\exp(\;-k{\theta})$로 표시되는 가장 보편적인 건조 모델식이 드럼건조에도 적용될 수 있었다.

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Ag grid와 전도성 고분자를 이용한 인쇄기반 OPV용 투명전극 형성 (Fabrication of Transparent Electrode Film for Organic Photovoltaic using Ag grid and Conductive Polymer)

  • 유종수;김정수;윤성만;김동수;김도진;조정대
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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    • pp.116.1-116.1
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    • 2011
  • Materials with a combination of high electrical conductivity and optical transparency are important components of many electronic and optoelectronic devices such as liquid crystal displays, solar cells, and light emitting diodes. In this study, to fabricate a low-resistance and high optical transparent electrode film for organic photovoltaic, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of thermal roll imprinted (TRI) poly-carbonate (PC) patterned films, the manufacture of high-conductivity and low-resistance Ag paste which was filled into patterned PC film using a doctor blade process and then coated with a thin film layer of conductive polymer by a spin coating process. As a result of these imprinting processes the PC films obtained a line width of $10{\pm}0.5{\mu}m$, a channel length of $500{\pm}2{\mu}m$, and a pattern depth of $7.34{\pm}0.5{\mu}m$. After the Ag paste was used to fill part of the patterned film with conductive polymer coating, the following parameters were obtained: a sheet resistance of $9.65{\Omega}$/sq, optical transparency values were 83.69 % at a wavelength of 550 nm.

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Tape Casting법에 의한 PMS-PZT계 세라믹스 제조 및 전기적 특성 (The Fabrication and Electrical Properties of PMS-PZT Ceramics using a Tape Casting Method)

  • 정현제;나은상;최성철
    • 한국세라믹학회지
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    • 제38권9호
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    • pp.860-865
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    • 2001
  • 본 논문은 출발물로서 2mol% CdO가 치환된 $0.05Pb(Mn_{1/3}Sb_{2/3})O_3-0.95Pb(Zr_{0.52}Ti_{0.48})O_3$ 분말을 제조 후, 닥터 블레이드 방법으로 green sheet를 제조하기 위한 slurry의 최적 공정첨가제 조성에 관한 연구를 수행하였다. 또한, 제조된 green sheet에 대하여 소결 특성과 두께 변환에 따른 유전 및 압전 특성을 관찰하였다. 공정첨가제의 첨가에 따른 점도거동을 통하여 slurry를 최적화하였고, TGA 분석으로 소결조건을 정하였으며, sheet의 특성에 미세구조와 XRD 등으로 측정하였다. 최적의 slurry는 고형분량 30vol%에 대해 분산제 3.0wt%에서 가장 안정화되었고, 이후 바인더/가소제(0.75/0.25) 3.0wt% 첨가시 점도는 7.55Pa${\cdot}$s이었다. Green sheet의 유전 및 압전 특성들은 각각 900$^{\circ}$C, 950$^{\circ}$C, 1000$^{\circ}$C로 소결온도를 증가함에 따라 다소 증가하였지만, 두께에 따른 특성들은 큰 변화가 관찰되지 않음을 확인하였다.

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A new manufacturing method of all ceramic restoration using alumina tape and presentation of clinical cases

  • Oh, Nam-Sik;Kim, Eui-Seong;Lee, Keun-Woo;Han, Jung-Suk;Kim, Dae-Joon;Lee, Myung-Hyun
    • 대한치과보철학회지
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    • 제38권6호
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    • pp.800-805
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    • 2000
  • In an effort to facilitate fabrication procedure of all ceramic crowns, a novel preparation method for all ceramic crown using alumina tape was developed. The alumina tape having a uniform thickness was cast by using Doctor blade method. The physical properties of newly introduced alumina tape has biaxial flexure strength of $500\sim600MPa$. The value of toughness is $3.18\sim3,28MPa.m^{1/2}$ which corelates with fracture and the linear shrinkage rate of the alumina tape is 0.44% during core production. The marginal fitness of the alumina tape all-ceramic restoration with $90{!`}$shoulder margin had average marginal discrepancy at $78.3{\S}$ > and average marginal gap at $44.4{\S}$ >. At the marginal preparation of $135{!`}$deep chamfer, the average marginal discrepancy at $82.1{\S}$ > and the average marginal gap at $40.2{\S}$ > had been reported. This fabrication procedure of all ceramic crowns with alumina tapes is easier and less technical sensitive for dental technicians. After restoration with new all ceramic crowns we followed the patients 2 years later, there were no complications as porcelain fractures or periodontal disease. We had good esthetic clinical results with new all ceramic crowns.

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$TiO_2$ 입자 크기에 따른 염료감응태양전지의 성능 변화 ($TiO_2$ Particle Size Effect on the Performance of Dye-Sensitized Solar Cell)

  • 김바울;박미주;이성욱;최원석;홍병유
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.145-146
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    • 2007
  • Dye-Sensitized Solar Cell Solar cells(DSSC) were appeared for overcoming global environmental problems and lack of fossil fuel problems. And it is one of study field that is getting into the spotlight lately because manufacturing method is more simple and inexpensive than existing silicon solar cells. Oxide semiconductor is used for adsorption of dye and electron transfer in DSSC study, and $TiO_2$ is used most usually. Overall light conversion efficiency is changed by several elements such as $TiO_2$ particle size and structure, pore size and shape. In this study, we report the solar cell performance of titania$(TiO_2)$ film electrodes with various particle sizes. $TiO_2$ particle size was 16 nm, 25 nm, and mixture of 16nm and 25 nm, and manufactured using Doctor blade method. When applied each $TiO_2$ film to DSSC, the best efficiency was found at 16nm of $TiO_2$ particle. 16nm of $TiO_2$ particle has the highest efficiency compared to the others, because particles with smaller diameters would adsorb more dye due to larger surface area. And in case of the mixture of 16nm and 25 nm, the surface area was smaller than expected. It is estimated that double layer is adsorbed a large amount of chemisorbed dye and improved light scattering leading due to efficiency concentration light than mono layer.

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