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류헌열,Myeong-Jun Kim,Nagendra Prasad Yerriboina,Ramanathan Srinivasan,박진구 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
This study presents an effi cient method for fabricating a stainless-steel metal mask with through hole arrays. The electrochemicalinteractions between the electrolyte and metal surface were analyzed by linear scan voltammetry (LSV) and electrochemicalimpedance spectroscopy (EIS). Dry fi lm resist patterning was utilized to apply a protective layer to the substratefor selective electrochemical etching. Through hole arrays were fabricated by electrochemical fabrication, which entailsimmersing two electrodes in an electrolyte and applying current. To improve the dimensional uniformity of the resultingthrough hole arrays, ammonium dodecyl sulfate (ADS) was added to the electrolyte and an insulation shield was placed infront of the substrate. Confocal 3D microscopy and optical microscopy were used to evaluate the dimensional uniformityand the depth and radius of hole patterns, respectively. LSV and EIS results showed that the stainless-steel surface was passivatedat a low potential and that the passivation layer was broken down at high potential. Adding ADS and the insulationshield improved the dimensional uniformity of the resulting through hole arrays.
미세금형 가공을 위한 전기화학식각 공정의 유한요소 해석 및 실험결과 비교
류헌열,임현승,조시형,황병준,이성호,박진구,Ryu, Heon-Yul,Im, Hyeon-Seung,Cho, Si-Hyeong,Hwang, Byeong-Jun,Lee, Sung-Ho,Park, Jin-Goo 한국재료학회 2012 한국재료학회지 Vol.22 No.9
To fabricate a precise micro metal mold, the electrochemical etching process has been researched. We investigated the electrochemical etching process numerically and experimentally to determine the etching tendency of the process, focusing on the current density, which is a major parameter of the process. The finite element method, a kind of numerical analysis, was used to determine the current density distribution on the workpiece. Stainless steel(SS304) substrate with various sized square and circular array patterns as an anode and copper(Cu) plate as a cathode were used for the electrochemical experiments. A mixture of $H_2SO_4$, $H_3PO_4$, and DIW was used as an electrolyte. In this paper, comparison of the results from the experiment and the numerical simulation is presented, including the current density distribution and line profile from the simulation, and the etching profile and surface morphology from the experiment. Etching profile and surface morphology were characterized using a 3D-profiler and FE-SEM measurement. From a comparison of the data, it was confirmed that the current density distribution and the line profile of the simulation were similar to the surface morphology and the etching profile of the experiment, respectively. The current density is more concentrated at the vertex of the square pattern and circumference of the circular pattern. And, the depth of the etched area is proportional to the current density.
듀얼 디퓨저 리소그래피를 이용한 3 차원 마이크로 구조의 제작
한동호,류헌열,조시형,박진구,Han, Dong-Ho,Hafeez, Hassan,Ryu, Heon-Yul,Cho, Si-Hyeong,Park, Jin-Goo 한국재료학회 2013 한국재료학회지 Vol.23 No.8
Recently, products that a have 3-dimensional(3D) micro structure have been in wide use. To fabricate these 3D micro structures, several methods, such as stereo lithography, reflow process, and diffuser lithography, have been used. However, these methods are either very complicated, have limitations in terms of patterns dimensions or need expensive components. To overcome these limitations, we fabricated various 3D micro structures in one step using a pair of diffusers that diffract the incident beam of UV light at wide angles. In the experiment, we used positive photoresist to coat the Si substrate. A pair of diffusers(ground glass diffuser, opal glass diffuser) with Gaussian and Lambertian scattering was placed above the photomask in the passage of UV light in the photolithography equipment. The incident rays of UV light diffracted twice at wider angles while passing through the diffusers. After exposure, the photoresist was developed fabricating the desired 3D micro structure. These micro structures were analyzed using FE-SEM and 3D-profiler data. As a result, this dual diffuser lithography(DDL) technique enabled us to fabricate various microstructures with different dimensions by just changing the combination of diffusers, making this technology an efficient alternative to other complex techniques.