Conjugated Conducting Polymers
Springer Science & Business Media, Dec 6, 2012 - Science - 310 pages
This book reviews the current understanding of electronic, optical and magnetic properties of conjugated polymers in both the semiconducting and metallic states. It introduces in particular novel phenomena and concepts in these quasi one-dimensional materials that differ from the well-established concepts valid for crystalline semiconductors. After a brief introductory chapter, the second chapter presents basic theore tical concepts and treats in detail the various models for n-conjugated polymers and the computational methods required to derive observable quantities. Specific spatially localized structures, often referred to as solitons, polarons and bipolarons, result naturally from the interaction between n-electrons and lattice displacements. For a semi-quantitative understanding of the various measure ments, electron-electron interactions have to be incorporated in the models; this in turn makes the calculations rather complicated. The third chapter is devoted to the electrical properties of these materials. The high metallic conductivity achieved by doping gave rise to the expression conducting polymers, which is often used for such materials even when they are in their semiconducting or insulating state. Although conductivity is one of the most important features, the reader will learn how difficult it is to draw definite conclusions about the nature of the charge carriers and the microscopic transport mechanism solely from electrical measurements. Optical properties are discussed in the fourth chapter.
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A.J. Heeger atoms Baeriswyl band band gap behaviour bipolarons bond alternation bond lengths calculations chain charged solitons Chem chemical shift cis-(CH coefficient conducting polymers configuration conjugated polymers correlation corresponding coupling Cryst D.K. Campbell decreases delocalized diffusion dimerization discussed dopant doping doping levels dynamics e—e interactions effects electron spin electron-electron interactions electron-phonon ENDOR spectrum energy ESR line excitations exciton experimental experiments finite polyenes frequency function Hamiltonian Heeger hopping Hubbard model Hückel hyperfine interactions increase inhomogeneous inter-chain Larmor frequency lattice Lett lineshape metallic molecules monomer motion neutral solitons nonlinear observed obtained one-dimensional optical absorption optical gap parameter peak Peierls phonon Phys polarons polyacetylene polyenes polypyrrole polythiophene properties proton quasi-particles Raman relaxation rates samples Sect shown in Fig solitons spectra spin density SSH model structure symmetry Synth t-conjugated t-electron temperature dependence theoretical theory trans trans-(CH trans-polyacetylene transition triplet values Vardeny