Effects of energy offsets and molecular packing on exciton and charge carrier dynamics in small-molecule donor-acceptor composites

Keshab Paudel; Brian Johnson; Afina Neunzert; Mattson Thieme; John Anthony; Oksana Ostroverkhova

doi:10.1117/12.2023402

10 September 2013 Effects of energy offsets and molecular packing on exciton and charge carrier dynamics in small-molecule donor-acceptor composites

Keshab Paudel, Brian Johnson, Afina Neunzert, Mattson Thieme, John Anthony, Oksana Ostroverkhova

Author Affiliations +

Proceedings Volume 8827, Optical Processes in Organic Materials and Nanostructures II; 88270Q (2013) https://doi.org/10.1117/12.2023402
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

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.

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Keshab Paudel, Brian Johnson, Afina Neunzert, Mattson Thieme, John Anthony, and Oksana Ostroverkhova "Effects of energy offsets and molecular packing on exciton and charge carrier dynamics in small-molecule donor-acceptor composites", Proc. SPIE 8827, Optical Processes in Organic Materials and Nanostructures II, 88270Q (10 September 2013); https://doi.org/10.1117/12.2023402

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KEYWORDS

Composites

Absorption

Excitons

Carrier dynamics

Continuous wave operation

Crystals

Electrodes

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