Polycarbonate carrier transport

With strong acceptors like the nitro groups in 3,6-dinitro-N-isopropylcarbazole (DN-NIPC) the ionisation potential is already larger than for the host matrix polycarbonate. In this case even the matrix acts as a trap for holes, thus preventing efficient charge carrier transport [26]. 

Benson et al. on the other hand achieved electron transport in pentacene based OFETs by employing hydroxyl-free polymeric gate dielectrics [61]. For example, polymethylethacrylate (PMMA), polycarbonate (PC) and polystyrol (PS) allowed for a pronounced electron and hole conduction in the transistor channel. The chemical structure of the used polymers and the schematic device setup are depicted in Fig. 15. The field-effect mobilities obtained are plotted in Fig. 16. The results prove that the charge carrier transport properties of both charge carrier species are rather... 

The effective carrier mobilities and their dependence on concentration for benztriazole derivatives embedded in polycarbonate were explained by the percolative aspects in photoconductivity [296]. The observed field dependence of the mobility for polycarbonate films doped with diethynylaminobenzaldehy-de-diphenyl hydrazone cannot be accounted for by any known hopping model [297]. The influence of the nature of the polymer matrix on photogeneration and transport properties of the molecule doped polymers was investigated in some papers [57, 58, 298, 299],... 

Recently, several photoactive polymers have been examined that fit these criteria. They include JV-polyvinylcarbazole (PVK) [101,102], (phenyl-methyljpolysilane (PMPS) [103], and amine-doped polycarbonate [104], All are known hole-transporting polymers. A large number of semiconductor nanoclusters can be doped into these polymers and interact with the polymer and facilitate carrier injection into the polymer [101-104]. Dramatic enhancement in charge generation efficiency has been observed. The availability of these semiconductor nanocluster/polymer composites opens the doorway for exploring transport-related applications. In the following sections, I review their photoconductive properties and discuss possibilities in other related areas. 

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