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2012 | OriginalPaper | Chapter

Charge Transport in Organic Semiconductors

Authors : Heinz Bässler, Anna Köhler

Published in: Unimolecular and Supramolecular Electronics I

Publisher: Springer Berlin Heidelberg

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Abstract

Modern optoelectronic devices, such as light-emitting diodes, field-effect transistors and organic solar cells require well controlled motion of charges for their efficient operation. The understanding of the processes that determine charge transport is therefore of paramount importance for designing materials with improved structure-property relationships. Before discussing different regimes of charge transport in organic semiconductors, we present a brief introduction into the conceptual framework in which we interpret the relevant photophysical processes. That is, we compare a molecular picture of electronic excitations against the Su-Schrieffer-Heeger semiconductor band model. After a brief description of experimental techniques needed to measure charge mobilities, we then elaborate on the parameters controlling charge transport in technologically relevant materials. Thus, we consider the influences of electronic coupling between molecular units, disorder, polaronic effects and space charge. A particular focus is given to the recent progress made in understanding charge transport on short time scales and short length scales. The mechanism for charge injection is briefly addressed towards the end of this chapter.

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next chapter Frontiers of Organic Conductors and Superconductors
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Metadata
Title
Charge Transport in Organic Semiconductors
Authors
Heinz Bässler
Anna Köhler
Copyright Year
2012
Publisher
Springer Berlin Heidelberg
Book
Unimolecular and Supramolecular Electronics I

Print ISBN: 978-3-642-27283-7

Electronic ISBN: 978-3-642-27284-4

Copyright Year: 2012

DOI
https://doi.org/10.1007/128_2011_218

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