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정전기력 분무 공정을 이용한 PEDOT:PSS의 박막층 형성 연구
당현우(H.W Dang),고정범(J.B Ko),김형찬(H.C Kim),최경현(K.H Choi),도양회(Y.H Doh) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Deposition through electro spray carries many advantages for the manufacture of printed electronics. The main advantage is the simplicity of the process and very high material usage. There are effectively no pollutant emissions and the process is inherently an environment friendly process. The process is low cost and can be very easily integrated to any bulk manufacturing process for mass production of the devices. In addition, the process is capable of producing thin layers of hundreds of nm and solution with viscosity as high as 100cps can be processed with this deposition technique. In this thesis, the electro spray of PEDOT:PSS has been discussed to improve the organic thin-film solar cell production efficiency.
백색 LED 조명의 색좌표 보정을 위한 고점도 형광체 정량 토출 공정 연구
김수완(S. W. Kim),양영진(Y. J. Yang),당현우(H. W. Dang),양봉수(B. S. Yang),김현범(H. B. Kim),최경현(K. H. Choi) 한국소성가공학회 2014 금형가공 심포지엄 Vol.2014 No.8
For the chromaticity correction it is necessary to dispense the high viscosity phosphor slurry as it affects white LED performance. However, it is difficult to dispense high viscosity fluorescent materials. In this study of micro-discharge in a variety of electrostatic printing technology viscosity for the dispensing of high viscosity phosphor slurry. We can use electrostatic printing technology to dispense the various high viscosity phosphor slurries. We have dispensed up to 50ug by the DOD discharge experiments conducted according to the process variables such as applied voltage, pneumatic pressure, frequency.
당현우(H. W. Dang),아시프(M. A. Ali Rehmani),도양회(Y. H. Doh),김동수(D. S. Kim),최경현(K. h. Choi) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Electrospray has immense application in non-contact coating of thin films on substrate such as in the fabrication of conductive layer for solar cells, surface treatment and in various applications. In this study a laboratory fabricated metal capillary nozzle head has been fabricated for electrospray application. The experimental observation of the laboratory fabricated nozzle shows that the uniform spray can be obtained by adjusting the appropriate flowrate, distance between the spray nozzle and counter nozzle and spray enhancer spring which is adjusted just above the metallic nozzle exit. Uniform line widths of 1mm were also achieved by traversing the substrate below the spray nozzle head under 10kV voltage. This study will help in classify the conditions the parameters which are responsible for electrospray and provides the insight for the future researches.