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Copper phthalocyanine (CuPc) based organic field-effect transistors (OFETs) with controllable threshold voltages (VTs) were demonstrated by inserting a poly(N-vinylcarbazole) (PVK) buffer layer between CuPc and SiO2. The PVK buffer layer enhances the crystallinity and improves the morphology of CuPc film, resulting in higher mobility up to 8.6 × 10-3 cm2 V-1 s-1. The VTs of the device can be changed...
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