Comparative study of hole transport in poly(p-phenylene vinylene) derivatives

Autor:	H. C. F. Martens, Paul W. M. Blom, H.F.M. Schoo
Rok vydání:	2000
Předmět:	chemistry.chemical_classification chemistry.chemical_compound Materials science chemistry Field (physics) Side chain Field dependence Poly(p-phenylene vinylene) Disorder model Polymer Conjugated system Molecular physics
Zdroj:	Physical Review B. 61:7489-7493
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.61.7489
Popis:	The dc mobility of holes in four poly(p-phenylene vinylene) (PPV) derivatives (three fully conjugated polymers with different side chains and one partially conjugated PPV) is examined as a function of temperature T and applied electrical field E. In all cases the mobility $\ensuremath{\mu}$ follows the empirical $\ensuremath{\mu}\ensuremath{\propto}\mathrm{exp}\ensuremath{\gamma}\sqrt{E}$ law. The specific temperature and electrical field dependence of the mobility is fitted within a (correlated) Gaussian disorder model. From the fits the energetic disorder, localization length, and average transport-site separation are determined. In the case of the fully conjugated polymers the different T and E dependencies of $\ensuremath{\mu}$ are completely determined by the energetic disorder. The relation between the obtained microscopic transport parameters and the specific chemical composition of the polymer material is discussed.
Databáze:	OpenAIRE
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