Ultra-flat and flexible transparent electrode based on Cu micro-belt network via low-cost process저가 공정으로 제조된 구리 마이크로 벨트 네트워크를 기반으로 한 고유연성 투명전극의 제조 및 특성

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Metal mesh is the most promising alternative to ITO due to its high optical and electrical performances. However, expensive and complex processes such as electron beam lithography or nanoimprint lithography lead to difficulties in the large-area process. To decrease the fabrication cost, electrospinning lithography, one of the patterning methods by using electrospun mask fibers, is drawing attention. Because it is easy to control the electrical and optical properties of electrode by a simple process and it is suitable for the large-area process. But, the electrode, made by electrospinning lithography, has low conductivity, high surface roughness and the low adhesion force between metal and substrate resulting in low flexibility. In this study, Cu micro-belt network (Cu MBN) based electrode is fabricated via electrospinning lithography with a wet etching process. To solve the problem of low electrical conductivity, the thickness of Cu MBN was increased from 100 nm to 300 nm in order to improve the electrical conductivity without sacrificing the transmittance of the electrode. As a result, the electrode having the best electrical, optical properties among existing research about Cu mesh made by electrospinning lithography was obtained. With this, to solve the low flexibility and high surface roughness, the Cu MBN was embedded in colorless polyimide film by solution casting process. Due to its embedded structure, the electrode shows high electrical conductivity, transparency, excellent mechanical stability, flexibility, and low surface roughness. Besides, the embedded Cu MBN shows excellent thermal stability, despite low oxidation resistance of Cu owing to embedded structure and high thickness of the electrode. Therefore, the Cu MBN was applied as a flexible heater. As a result, high thermal stability of cPI and excellent thermal conductivity of Cu MBN lead to high saturation temperature $(120 ^\circ C)$ at very low voltage (2.3 V).
Advisors
Kim, Il-Dooresearcher김일두researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2016.8 ,[vi, 56 p. :]

Keywords

Transparent electrodes; flexible heater; metal mesh; copper; colorless polyimide; embedding; 투명 전극; 유연 히터; 메탈 메쉬; 구리; 무색 투명한 폴리이미드; 임베딩 공정

URI
http://hdl.handle.net/10203/221564
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663402&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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