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Transistors are constructed using chemical vapor-deposited graphene on mechanically flexible polyimide and incorporate a low-temperature atomic-layer-deposited gate dielectric. Three-micrometer gate length transistors with Vds = 2.0 V have a drive current of >; 0.3 A/mm with a transconductance of >; 3 mS/mm. The peak hole and electron mobilities are 295 and 106 cm2/V · s, respectively. Subsequent to repeated flexing, the ambipolar characteristics and extremely low gate leakage remain intact with <; 15% reduction in the peak carrier mobility. Good agreement is obtained between the measured mobility and a physically based empirical model and is consistent with the mobility limited by impurity levels and surface roughness. Using graphene-on-polyimide transistors, radio-frequency functionalities, including signal amplification and phase shifting, are demonstrated, and routes for performance improvement are discussed. The results are important for the development of graphene-based electronics on mechanically flexible substrates.
Date of Publication: Oct. 2011