Abstract
The molecular semiconductors exhibit a wide range of electronic properties not necessarily shown by conventional covalent or ionic semiconductors. Study of the conductive organic solids, particularly the polymeric as opposed to the charge-transfer type, is fruitful because of the deeper insights they offer as to carrier birth and transport in systems possessing short range order.
Conduction in the polymeric organic solids is of the hopping type, increasing with frequency of the applied field. As judged from the thermoelectric power, it may be dominated by either holes or electrons, depending upon the chemical makeup. It is not certain from Hall effects studies whether the Hall ‘mobilities’ are normal or suppressed, such as found in amorphous covalent solids. Both the intra- and inter-chain mobilities are frequency dependent.
Polarization in the polymeric organic solids is observed on occasions to become very large. This is due to a unique form of polarizability,nomadic polarization, wherein certain charges are free to roam over large ranges before being blocked. The large dielectric constants observed are temperature, pressure, and frequency dependent.
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Pohl, H.A. Quasi one-dimensional electronic conduction and nomadic polarization in polymers. J Biol Phys 2, 113–172 (1974). https://doi.org/10.1007/BF02308899
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DOI: https://doi.org/10.1007/BF02308899