Photogeneration and Ultrafast Dynamics of Excitons and Charges in P3HT/PCBM Blends

Jorge Piris*, Tieneke E. Dykstra, Artem A. Bakulin, Paul H. M. van Loosdrecht, Walter Knulst, M. Tuan Trinh, Juleon M. Schins, Laurens D. A. Siebbeles

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The photogeneration quantum yield and dynamics of charge carriers and excitons in thin films of neat regioregular poly(3-hexylthiophene) (P3HT) and blends with [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) were studied with ultrafast optical pump-probe spectroscopy. In neat P3HT the quantum yield for direct photogeneration of charge carriers amounts to 0.15 per absorbed photon. The remaining fraction of absorbed photons leads to formation of excitons. Recombination of charges reduces the quantum yield to about 25% of its initial value on a time scale of 100 ps followed by decay to a no longer observable yield after Ins. Addition of 50% PCBM by weight leads to ultrafast (

Original languageEnglish
Pages (from-to)14500-14506
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number32
DOIs
Publication statusPublished - 13-Aug-2009

Keywords

  • BULK-HETEROJUNCTION
  • CONJUGATED POLYMERS
  • SOLAR-CELLS
  • REGIOREGULAR POLYTHIOPHENE
  • CARRIER GENERATION
  • POLY(3-HEXYLTHIOPHENE)
  • SPECTROSCOPY
  • STATES
  • FILMS
  • NANOCRYSTALS

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