Photoinduced carrier generation and recombination dynamics of a trilayer cascade heterojunction composed of poly(3-hexylthiophene), titanyl phthalocyanine, and C60

Jaehong Park, Obadiah G. Reid, Garry Rumbles

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We use flash-photolysis time-resolved microwave conductivity experiments (FP-TRMC) and femtosecond-nanosecond pump-probe transient absorption spectroscopy to investigate photoinduced carrier generation and recombination dynamics of a trilayer cascade heterojunction composed of poly(3-hexylthiophene) (P3HT), titanyl phthalocyanine (TiOPc), and fullerene (C60). Carrier generation following selective photoexcitation of TiOPc is independently observed at both the P3HT/TiOPc and TiOPc/C60 interfaces. The transient absorption results indicate that following initial charge generation processes to produce P3HT•+/TiOPc•- and TiOPc•+/C60•- at each interface from (P3HT/TiOPc/C60), the final charge-separated product of (P3HT•+/TiOPc/C60•-) is responsible for the long-lived photoconductance signals in FP-TRMC. At the P3HT/TiOPc interface in both P3HT/TiOPc and P3HT/TiOPc/C60 samples, the electron transfer appears to occur only with the crystalline (weakly coupled H-aggregate) phase of the P3HT.

Original languageEnglish
Pages (from-to)7729-7739
Number of pages11
JournalJournal of Physical Chemistry B
Volume119
Issue number24
DOIs
Publication statusPublished - Jun 18 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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