Abstract
On a microscopic scale polymers are characterized by a strongly anisotropic electronic structure. This is a consequence of the chain-like form of the molecules, having a strong covalent bonding along the chain and comparatively weak bonding of van der Waals type between the chains. Band-structure calculations, based on an ideal and regular crystalline polymer structure, can demonstrate this property. As an example, the bandwidth of electronic states in polyacetylene is of the order of 10 eV along the chain, but only some 0.1 eV perpendicular. However, the structure of most polymers ranges between crystalline and completely amorphous; this may give rise to considerable variations of the interchain transfer integral and thus also of the bandwidth perpendicular to the chain direction. The transfer integrals and the bandwidth parallel to the chain axis are usually less affected.
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Rehwald, W., Kiess, H.G. (1992). Charge Transport in Polymers. In: Kiess, H.G. (eds) Conjugated Conducting Polymers. Springer Series in Solid-State Sciences, vol 102. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-46729-5_3
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DOI: https://doi.org/10.1007/978-3-642-46729-5_3
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