Singlet, triplet, electron and hole transport along single polymer chains

Matthew Bird, Gina Mauro, Lori Zaikowski, Xiang Li, Obadiah Reid, Brianne Karten, Sadayuki Asaoka, Hung Cheng Chen, Andrew R. Cook, Gary Rumbles, John R. Miller

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

Abstract

The diffusion of singlet and triplet excitons along single polyfluorene chains in solution has been studied by monitoring their transport to end traps. Time-resolved transient absorption and steady state fluorescence were used to determine fractions of excitons that reach the end caps. In order to accurately determine the singlet diffusion coefficient, the fraction of polymer ends that have end traps was determined through a combination of NMR and triplet quenching experiments. The distributions of polymer lengths were also taken into account and the resulting analysis points to a surprisingly long singlet diffusion length of 34 nm. Experiments on triplet transport also suggest that the entire 100nm+ chain is accessible to the triplet during its lifetime suggesting a lack of hindrance by defects or traps on this timescale. Time Resolved Microwave Conductivity measurements were also performed on a series of different length oligo- and polyfluorenes in solution allowing a global fit to be performed to extract an accurate intrachain mobility of 1.1 cm2/Vs.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9549
ISBN (Print)9781628417159
DOIs
Publication statusPublished - 2015
EventPhysical Chemistry of Interfaces and Nanomaterials XIV - San Diego, United States
Duration: Aug 9 2015Aug 12 2015

Other

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

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Keywords

  • Conjugated polymers
  • exciton diffusion length
  • microwave conductivity
  • OPV
  • polyfluorene
  • single chain

ASJC Scopus subject areas

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

Cite this

Bird, M., Mauro, G., Zaikowski, L., Li, X., Reid, O., Karten, B., Asaoka, S., Chen, H. C., Cook, A. R., Rumbles, G., & Miller, J. R. (2015). Singlet, triplet, electron and hole transport along single polymer chains. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9549). [95490E] SPIE. https://doi.org/10.1117/12.2188873