Liquid thin film dewetting-driven micropatterning of reduced graphene oxide electrodes for high performance OFETs

초록

We present a novel approach to produce high-resolution reduced graphene oxide (rGO) micropatterns based on a dewetting phenomenon of liquid thin films. The uniform liquid thin film of aqueous graphene oxide (GO) dispersion was formed by the meniscus dragging deposition method on a pre-patterned silanized substrate. Subsequently, selective dewetting of the water layer was induced due to the surface energy gradient on the coating substrates. After drying and chemical reduction, the high-resolution rGO micropatterns with a minimum feature size of 10 m were realized over a large area substrate by consuming less than 1 L of GO solution per square centimeter. As a demonstration of the application of this patterning technique, we have successfully fabricated organic field-effect transistors (OFETs) based on rGO pattern arrays as source-drain electrodes. The OFETs with the rGO electrodes exhibited a field effect mobility of 0.6 cm(2) (V s)(-1) with an on/off ratio of 1.79 x 10(6), which is higher than that of the devices with Au source-drain contacts.

키워드