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RISS 인기검색어
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- 저자 : Robert Bail (검색결과 4 건)
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Robert Bail,Joon Won Kang,You Jung Kang,Byung Doo Chin 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.1
Solution processing of crosslinkable small molecular thin films is potentially attractive for the fabrication of large-area displaypanels based on organic light-emitting diodes (OLEDs). The characteristics of a wet-processed film made of a thermallycrosslinked small-molecular material can be controlled by simply adding a cosolvent to its solution. The surface morphologyof a nanometer-scale thin film made of N4,N4′-di(naphthalen-1-yl)-N4,N4′-bis(4-vinylphenyl)biphenyl-4,4′-diamine(VNPB), dissolved in chlorobenzene, improved dramatically after the addition of 20% cyclohexanone. At the same time,better resistance of the crosslinked layer to a number of solvents frequently used in the fabrication of the adjacent emittinglayer was achieved. Moreover, the maximum current efficiency in the binary solvent device increased significantly to 22.2Cd/A, compared to 9.7 Cd/A in the reference device without VNPB, and the device lifetime was extended by up to 74.8%. This illustrates a simple and additive-free strategy to prevent the formation of defects in solution processed thin-film stacksmade of small-molecular materials. The insights gained will be helpful in the solution-based manufacture of large-areaOLEDs and other optoelectronic components.
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Foldable Organic Devices Based on the Graphene/Metal Grid Composite Electrodes
Jo, Sung Min,Yoon, Dai Geon,Bail, Robert,Chin, Byung Doo The Electrochemical Society 2016 ECS journal of solid state science and technology Vol.5 No.1
<P>Foldable electrodes with solution-processed graphene/silver nanowire (AgNW) composite circuit were formed on the surface-treated commercial paper substrates. Compared with neat graphene or AgNW electrodes, graphene/AgNW circuit showed both folding stability as well as sufficiently low sheet resistance. For the inside (-180 degrees) and outside (+180 degrees) folding angle condition, the circuits revealed a small change in conductance, maintaining the electronic path on foldable paper. Top emitting OLED (TOLED) on paper was prepared by thermal evaporation of several organic layers onto the reflective anode, where the interconnecting graphene/AgNW circuit supplied the bias voltage and current. Luminous efficiency behavior of TOLED on paper showed stable light emitting characteristics on paper, while the current density and brightness was reduced by repeated folding of driving circuit. (C) 2015 The Electrochemical Society. All rights reserved.</P>
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Dai Geon Yoon,You Jung Kang,Robert Bail,진병두 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.2
In this paper, the effects of the combination of solvents on the uniformity of a dried emitting layer and on device performance were studied. Green emitter inks with various solvents were prepared, and it was seen that good film uniformity of printed layers could be obtained with a solvent mixture with different boiling points, which reduced the coffee ring effect on a dried surface. During the inkjet process, the drop injection condition aiming was also controlled for better drop-to-drop spacing and reduction of the line-edge roughness. Printed patterns of a small molecular/polymer hybrid emitting layer, composed of the chlorobenzene-dichlorobenzene solvent mixture, showed significantly reduced roughness of the microscopic surface and improved efficiency of the inkjet device, at levels nearly comparable to those of spin-coated patterns. A suitable hole transport layer (HTL) was also further developed as an interfacial material, prior to the solution processing of the emitter. The cross-linkable HTL was composed of triphenylamine as the cross-linking unit and a fluorene-based compound. At the optimized condition of the solvent formulation, printed droplets within 100μm×300μm pixels formed a uniform stripe without remarkable coffee-ring defects and line-edge surface roughness.
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신축성 기판에 삽입된 은 나노와이어 네트워크 전극의 전사특성 조절 및 유기태양전지 적용
황경석(Gyeong seok Hwang),로버트바일(Robert Bail),진병두(Byung-Doo Chin) 한국고분자학회 2016 폴리머 Vol.40 No.6
은 나노와이어는 유연/신축 투명전극의 전도성 재료로 많은 관심을 받고 있다. 본 연구에서는 실란 커플링제 표면 개질을 통해 폴리디메틸실록산 탄성체 기판에 은 나노와이어 네트워크 구조를 전사, 삽입시키고 그 전사율을 제어하였다. 은 나노와이어가 삽입된 탄성체 기판은 유리 위에 은 나노와이어 네트워크를 코팅하고 이어 실록산폴리머를 코팅, 경화시킨 후, 유리로부터 이를 떼어 내어 제조하였다. 은 나노와이어의 전사율과 두께는 네트워크 구조체 위에 실란계 개질제(메타크릴옥시프로필트리메틸실란; MPS, 및 옥타데실트리클로로실란; OTS)를 코팅하여 조절하였는데, 이 탄성체 투명필름은 MPS로 개질 시 투과율이 20% 증가했고, 낮은 표면 거칠기로 유기박막 소자에 더 적합했다. OTS 표면개질 조건으로 제작한 투명전극은 40%의 신장조건으로 200회의 신축성 테스트를 했을 때 약 3배로 저항이 증가하였다. 최종적으로 MPS 개질 조건에서 3.2%의 광전효율을 갖는 은 나노와이어 전극형 유기 태양전지를 제작하였다. Recently, silver nanowires (AgNWs) have had a great interest as a conducting materials for flexible and transparent electrodes. In this paper, we studied the embedded network structure formation of AgNWs in polydimethylsiloxane (PDMS) by stamping transfer process and various surface treatments. We have designed various conditions of AgNWs surfaces using silane-coupling modifiers. Transfer yield of AgNWs was adjusted by the variation of surface treatment condition with silane modifier coating such as methacryloxypropyltrimethoxysilane (MPS) and octadecyltrichlorosilane (OTS) on top of AgNWs. Transparency of embedded AgNWs film has increased up to 20% at the optimum surface treatment condition. Especially, MPS treatment process was found to be appropriate for thin film organic device substrate due to its generation of transferred AgNWs with low surface roughness. Transparent electrodes with OTS treatment showed resistivity with three times at 40% elongation at 200 cycle test. An organic solar cell with 3.2% of power conversion efficiency was fabricated with MPS-treated AgNW networks in a PDMS substrate.
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