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전영은,박기복,진한별,정성철,고흥석,이인남,이춘협,Young Kuil Joo 한국광학회 2015 Current Optics and Photonics Vol.19 No.5
A capacitive-type touch screen panel (TSP) composed of silver nanowire (AgNW) crossing electrodesand transparent bridge structures was fabricated on a polycarbonate film. The transparent bridge structurewas formed with a stack of Al-doped ZnO (AZO) electrodes and SU-8 insulator. The stable and robustcontinuity of the bridge electrode over the bridge insulator was achieved by making the side-wall slopeof the bridge insulator low and depositing the conformal AZO film with atomic layer deposition. Withan extended exposure time of photolithography, the lower part of the SU-8 layer around the regionuncovered by the photomask can be exposed enough to the UV light scattered from the substrate. Thisleads to the low side-wall slope of the bridge insulator. The fabricated TSP sample showed a largecapacitance change of 22.71% between with and without touching. Our work supplies the technologicalclue for ensuring long-term reliability to the highly flexible and transparent TSP made by using conventionalfabrication processes