Effect of the controllable molecular ordering in a new polymer on carrier transport and photovoltaic properties

V. Kazukauskas*, M. Pranaitis, C. Sentein, L. Rocha, P. Raimond, I. Duyssens, I. Van Severen, T. Cleij, L. Lutsen, D. Vanderzande

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


The functionalized soluble poly(p-phenylene vinylene) derivative bearing polar molecules (nlo-ppv) was designed and synthesized to investigate effects of molecular orientation in single-layer polymer photovoltaic devices. The active molecule is the 4-(n-butyl-n-2-hydroxyethyl)-1-nitro-benzene group on the copolymer. The grafting of the molecule with a donor/transmitter/acceptor structure, possessing a large ground state dipole moment, enables their orientation by a dc-electric field. An internal electric field in such layer facilitates exciton dissociation and improves charge transport. We report increase of the external quantum efficiency by a factor of 1.5 to 2 upon orientation. The associated effects on the carrier injection and transport depending on the orientation direction were evidenced.
Original languageEnglish
Pages (from-to)728-738
JournalMolecular Crystals and Liquid Crystals
Publication statusPublished - 2008
Externally publishedYes


  • energy conversion efficiency
  • molecular orientation
  • optical and electrical properties
  • polymers

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