Applied Physics Letters · 2003 · 122 citations · 14 references
Natural SciencesElectrical EngineeringMaterials ScienceElectronic MaterialsSemiconductor DevicesThin FilmsElectrode MaterialsOrganic Electronic MaterialsSemiconductor Thin FilmsThin Film Electrical PropertiesThin-film MaterialsThin-film TransistorsActive MaterialsCharge InjectionOrganic ElectronicsOrganic Field-effect TransistorsOrganic Thin FilmsOrganic Thin-film TransistorsSandwich StructuresThreshold Voltage
Organic thin-film transistors (OTFTs) having source/drain electrodes sandwiched between copper phthalocyanine (CuPc) and cobalt phthalocyanine (CoPc) layers, CuPc/CoPc SC OTFTs, are investigated. Comparing their properties with that of CuPc-based top-contact OTFT, field-effect mobility increases from 0.04 to 0.11 cm2/Vs, threshold voltage shifts from −13.8 to −8.9 V, and the current on/off ratio maintains at a level of 105. A top-contact OTFT with a layer of CuPc and a layer of CoPc (10%)–CuPc mixture reveals that the combination of CuPc and CoPc enhances charge injection from the source electrode into the active layer and increases the off-state current. The sandwich configuration increases the field-effect mobility, reduce the threshold voltage, and improve the on/off ratio at the same time. Our results indicate that using a double-layer of active organic materials in sandwich configuration is an effective way to improve OTFT performance.
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Large-scale complementary integrated circuits based on organic transistors
B. K. Crone, A. Dodabalapur, Y.-Y. Lin et al. · Nature · 2000 · 1.3K citations
Engineering, Computer Engineering, Electrical Engineering +14