Thermally Controlled, Patterned Graphene Transfer Printing for Transparent and Wearable Electronic/Optoelectronic System

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Choi, Moon Kee; Park, Inhyuk; Kim, Dong Chan; Joh, Eehyung; Park, Ok Kyu; Kim, Jaemin; Kim, Myungbin; Choi, Changsoon; Yang, Jiwoong; Cho, Kyoung Won; Hwang, Jae-Ho; Nam, Jwa-Min; Hyeon, Taeghwan; Kim, Ji Hoon; Kim, Dae-Hyeong

Issue Date
John Wiley & Sons Ltd.
Advanced Functional Materials, Vol.25 No.46, pp.7109-7118
Graphene has been highlighted as a platform material in transparent electronics and optoelectronics, including flexible and stretchable ones, due to its unique properties such as optical transparency, mechanical softness, ultrathin thickness, and high carrier mobility. Despite huge research efforts for graphene-based electronic/optoelectronic devices, there are remaining challenges in terms of their seamless integration, such as the high-quality contact formation, precise alignment of micrometer-scale patterns, and control of interfacial-adhesion/local-resistance. Here, a thermally controlled transfer printing technique that allows multiple patterned-graphene transfers at desired locations is presented. Using the thermal-expansion mismatch between the viscoelastic sacrificial layer and the elastic stamp, a "heating and cooling" process precisely positions patterned graphene layers on various substrates, including graphene prepatterns, hydrophilic surfaces, and super-hydrophobic surfaces, with high transfer yields. A detailed theoretical analysis of underlying physics/mechanics of this approach is also described. The proposed transfer printing successfully integrates graphene-based stretchable sensors, actuators, light-emitting diodes, and other electronics in one platform, paving the way toward transparent and wearable multifunctional electronic systems.
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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