Conjugated Conducting PolymersHelmut Kiess 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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Results 1-5 of 81
Page 9
... trans- ( CH ) , polymer chain H C. Fig . 2.2 a , b . The two possible ( non - degene- rate ) bond alternation patterns in an idealized quasi - one - dimensional cis- ( CH ) x polymer chain : a cis - transoid form ; b trans - cisoid form ...
... trans- ( CH ) , polymer chain H C. Fig . 2.2 a , b . The two possible ( non - degene- rate ) bond alternation patterns in an idealized quasi - one - dimensional cis- ( CH ) x polymer chain : a cis - transoid form ; b trans - cisoid form ...
Page 12
... trans- ( CH ) . The explicitness and relative simplicity of the SSH model allows one to make extensive predictions for the properties of trans- ( CH ) , x , and we survey these predictions and compare them briefly to experimental ...
... trans- ( CH ) . The explicitness and relative simplicity of the SSH model allows one to make extensive predictions for the properties of trans- ( CH ) , x , and we survey these predictions and compare them briefly to experimental ...
Page 13
... trans- ( CH ) , and the possible breakdown of the quasi - one - dimensional picture of localized , nonlinear excita- tions . In addition , we discuss the ( fairly incomplete ) current understanding of what remain perhaps the two most ...
... trans- ( CH ) , and the possible breakdown of the quasi - one - dimensional picture of localized , nonlinear excita- tions . In addition , we discuss the ( fairly incomplete ) current understanding of what remain perhaps the two most ...
Page 18
... trans- ( CH ) ,. We shall discuss some of these results for perfect three - dimensional crystals of trans- ( CH ) , in Sect . 2.7 . Although computationally very intensive , the LDA method is often simpler than the HF approach . Some ...
... trans- ( CH ) ,. We shall discuss some of these results for perfect three - dimensional crystals of trans- ( CH ) , in Sect . 2.7 . Although computationally very intensive , the LDA method is often simpler than the HF approach . Some ...
Page 25
Helmut Kiess. for trans - polyacetylene and , mutatis mutandis , more general ... ( CH ) units . In general , calculations are carried out in the Born ... CH lattice sites in the reference ionic configuration , and that in the original ...
Helmut Kiess. for trans - polyacetylene and , mutatis mutandis , more general ... ( CH ) units . In general , calculations are carried out in the Born ... CH lattice sites in the reference ionic configuration , and that in the original ...
Contents
1 | |
7 | |
7 | 44 |
13 | 60 |
15 | 72 |
18 | 101 |
References | 114 |
28 | 115 |
Charge Transport in Polymers | 135 |
Theory and Experiment | 141 |
References | 171 |
References | 214 |
References | 297 |
Subject Index | 305 |
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Common terms and phrases
A.J. Heeger A.R. Bishop atoms Baeriswyl band band gap behaviour bipolarons bond alternation bond lengths calculations chain charged solitons Chem chemical shift cis-(CH conducting polymers configuration conjugated polymers correlation effects Coulomb interactions coupling Cryst D.K. Campbell defects dependence dimerization discussed dopant doping doping levels e-e interactions electron correlation electron spin electron-electron interactions electron-phonon ENDOR energy excitations exciton experimental finite polyenes frequency function Hamiltonian Hartree-Fock hopping Hubbard model Hückel inter-chain kink Kivelson lattice Lett linewidth magnetic Mazumdar metallic molecular molecules neutral solitons nonlinear nonlinear optical nuclear observed obtained one-dimensional optical absorption optical gap parameter peak Peierls Peierls-Hubbard model phonon Phys polarons polyacetylene polyenes polypyrrole polythiophene properties proton quantum quasi-particles Raman relaxation resonance Sect Solid State Commun spectra spectrum spin density SSH model susceptibility symmetry Synth temperature theoretical theory trans-(CH trans-polyacetylene transition triplet valence bond values Vardeny