Photo-induced carrier generation and recombination dynamics probed by combining time-resolved microwave conductivity and transient absorption spectroscopy

Jaehong Park, Obadiah G. Reid, Garry Rumbles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We examined photoinduced charge-generation dynamics of the poly(3-hexylthiophene) (P3HT)/titanyl phthalocyanine (TiOPc) bilayer and the P3HT/TiOPc/C60 trilayer using the combination of flash-photolysis time-resolved microwave conductivity experiments (fp-TRMC) and classic pump-probe transient absorption (TA) spectroscopy following dominant excitation of the P3HT layer. The superlinear increase of φΣμ for the P3HT/TiOPc bilayer, compared to the φΣμ sum of each P3HT and TiOPc layer suggest photoinduced carrier-generation. Furthermore, the superlinear increase of φΣμ of the P3HT/TiOPc/C60 trilayer with respect to the each P3HT/TiOPc and TiOPc/C60 bilayers evinces charge migration from one interface to the other interface. In addition, with selective photoexcitation on the P3HT layer, both amorphous and H-aggregated P3HT domains participate in electron transfer ([P3HT∗/TiOPc]→[P3HT•+/TiOPc•-]), contrasting to the previous observation where with selective excitation of the TiOPc layer, only the H-aggregated P3HT domain involves in hole transfer ([P3HT/TiOPc→[P3HT•+/TiOPc•-]) to produce P3HT•+/TiOPc•- in J. Phys. Chem. B 119(24), 7729 - 7739 (2015). These results under different excitation conditions are consistent with calculated energetic driving force (ΔECS) for charge generation which is -0.58 eV and -0.73 eV for amorphous and H-aggregated P3HT domains under the P3HT layer excitation, while 0.04 eV and -0.11 eV for amorphous and H-aggregated P3HT domains under the TiOPc layer excitation.

Original languageEnglish
Title of host publicationPhysical Chemistry of Interfaces and Nanomaterials XIV
EditorsEric R. Bittner, Sophia C. Hayes
PublisherSPIE
ISBN (Electronic)9781628417159
DOIs
Publication statusPublished - Jan 1 2015
EventPhysical Chemistry of Interfaces and Nanomaterials XIV - San Diego, United States
Duration: Aug 9 2015Aug 12 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9549
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherPhysical Chemistry of Interfaces and Nanomaterials XIV
CountryUnited States
CitySan Diego
Period8/9/158/12/15

Keywords

  • Transient microwave conductivity
  • and photoinduced electron transfer
  • carrier dynamics
  • excited-state dynamics
  • transient absorption spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Park, J., Reid, O. G., & Rumbles, G. (2015). Photo-induced carrier generation and recombination dynamics probed by combining time-resolved microwave conductivity and transient absorption spectroscopy. In E. R. Bittner, & S. C. Hayes (Eds.), Physical Chemistry of Interfaces and Nanomaterials XIV [95490O] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9549). SPIE. https://doi.org/10.1117/12.2186340