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Proceedings Paper

Effects of energy offsets and molecular packing on exciton and charge carrier dynamics in small-molecule donor-acceptor composites
Author(s): Keshab Paudel; Brian Johnson; Afina Neunzert; Mattson Thieme; John Anthony; Oksana Ostroverkhova
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Paper Abstract

We present a study of optical, photoluminescent (PL), and photoconductive properties of small-molecule D/A bulk heterojunctions of functionalized fluorinated anthradithiophene (ADT-R-F) and pentacene (Pn-R-F8) derivatives. We chose one of the ADT derivatives, ADT-TES-F, which exhibits a 2D “brick-work” .π-stacking, as the donor, and ADT-TIPS-F (2D “brick-work”), ADT-TSBS-F (1D “sandwich-herringbone”), Pn-TIPS-F8 (2D “brick-work”), or Pn-TCHS-F8 (1D “sandwich-herringbone”), as acceptors. We measured PL and photoconductivity at time scales from sub-nanoseconds to many seconds after photoexcitation, at various acceptor concentrations, under various experimental conditions. The choice of acceptors enabled us to distinguish between effects of the LUMO energy offsets between the donor and acceptor molecules and those of the molecular packing in the acceptor domains on exciton and charge carrier dynamics.

Paper Details

Date Published: 10 September 2013
PDF: 8 pages
Proc. SPIE 8827, Optical Processes in Organic Materials and Nanostructures II, 88270Q (10 September 2013); doi: 10.1117/12.2023402
Show Author Affiliations
Keshab Paudel, Oregon State Univ. (United States)
Brian Johnson, Oregon State Univ. (United States)
Afina Neunzert, Oregon State Univ. (United States)
Mattson Thieme, Oregon State Univ. (United States)
John Anthony, Univ. of Kentucky (United States)
Oksana Ostroverkhova, Oregon State Univ. (United States)

Published in SPIE Proceedings Vol. 8827:
Optical Processes in Organic Materials and Nanostructures II
Manfred Eich; Jean-Michel Nunzi; Rachel Jakubiak, Editor(s)

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