In addition to optimizing the charge carrier mobility (μ) in organic semiconductor devices, it is critical to improve operational stability. We investigated organic field-effect transistors (OFETs) made from several conjugated polymers based on indacenodithiazole (IDTz). Surface treatment of the electrode enabled us to tune the transport from p-type to n-type, while thermal annealing improved μ to 1.35 cm2/Vs. We bias-stressed the OFETs for about 24h hours at constant DC conditions (VGS= VDS= 60V) and found that in the most optimized devices only minor changes in the properties occur, i.e. 3% decrease in mobility and threshold voltage shift of maximum 2V.
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