Japanese Journal of Applied Physics · 2007 · 19 citations · 11 references
EngineeringMaterials EngineeringMaterials ScienceElectronic MaterialsSemiconductor DevicesSemiconductor MaterialsDielectric MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPolymer Thin FilmsSemiconductor Device MaterialsSemiconductor Thin FilmsDryingOrganic DielectricsOrganic ElectronicsOrganic Field-effect TransistorsOrganic Thin FilmsOrganic Thin-film TransistorsSemiconductor CharacterizationSemiconductor Technology
Organic field-effect transistors (OFETs) with water-soluble and crosslinkable poly(vinyl alcohol) (PVA) as a gate insulator and poly(3-hexylthiophene) (P3HT) as an active semiconductor were fabricated, and the device performances were investigated. Heat-crosslinked PVA displays better dielectric properties because it contains less water and the OFETs show enhanced on/off ratios and improved stability. P3HT films were fabricated by spin-coating and drop-casting methods and characterized by atomic force microscopy (AFM) and UV–visible absorption spectra. The mobilities of drop-cast P3HT films are one order higher than those of the spin-coated films, which is ascribed to the slower drying of the solvent and more-ordered structure in the films. However, OFETs with drop-cast P3HT show inferior saturation characteristics and lower on/off ratios. This is probably due to higher roughness and thickness of the drop-cast film and nonnegligible carrier transportation in the bulk, which can be demonstrated by the conductance measurements.
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Engineering, Computer Engineering, Electrical Engineering +14