Charge photogeneration and transport in side-chain carbazole polymers and co-polymers

Huawei Li, Roberto Termine, Nicolas Godbert, Luigi Angiolini, Loris Giorgini, Attilio Golemme

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The photoconductivity, hole mobility and charge photogeneration efficiency of a series of side-chain carbazole homopolymers and copolymers (with azo side-chains) have been investigated. Cyclic voltammetry measurement of frontier orbitals energies show that the HOMO energy is determined by the nature and the position of attachment of the linker between the main chain and the carbazole, the azo-moiety being not relevant in this respect. Hole mobility is not influenced by the HOMO energy but seems to depend on the degree of conformational mobility of the side-chains, reaching values of the order of 10-3cm2V-1s-1 in the best cases. The HOMO energy is instead extremely important when considering photogeneration efficiency, that can change by 10 orders of magnitude depending on the density of the carbazole side-chains in co-polymers and on the linker nature and attachment position. © 2011 Elsevier B.V. All rights reserved.
Original languageEnglish (US)
Pages (from-to)1184-1191
Number of pages8
JournalOrganic Electronics
Volume12
Issue number7
DOIs
StatePublished - Jul 2011

ASJC Scopus subject areas

  • Materials Chemistry
  • Biomaterials
  • Chemistry(all)
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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