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Baghgar M, Barnes MD. Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging. ACS Nano. 2015;9(7):7105-12doi: 10.1021/acsnano.5b03422.
Baghgar, M., & Barnes, M. D. (2015). Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging. ACS nano, 9(7), 7105-12. https://doi.org/10.1021/acsnano.5b03422
Baghgar, Mina, and Barnes, Michael D. "Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging." ACS nano vol. 9,7 (2015): 7105-12. doi: https://doi.org/10.1021/acsnano.5b03422
Baghgar M, Barnes MD. Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging. ACS Nano. 2015 Jul 28;9(7):7105-12. doi: 10.1021/acsnano.5b03422. Epub 2015 Jul 09. PMID: 26095304.
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ACS Nano. 2015 Jul 28;9(7):7105-12. doi: 10.1021/acsnano.5b03422. Epub 2015 Jul 09.

Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging.

ACS nano

Mina Baghgar, Michael D Barnes

Affiliations

  1. †Department of Physics and ‡Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States.

PMID: 26095304 DOI: 10.1021/acsnano.5b03422

Abstract

We show that surface electronic properties of poly-3-hexylthiophene (P3HT) crystalline nanofibers as probed by Kelvin probe force microscopy (KPFM) depends sensitively on the degree of polymer packing order and dominant coupling type (e.g., H- or J-aggregate) as signaled by absorption or photoluminescence spectroscopy. Nominal HOMO energies between high molecular weight (J-aggregate) nanofibers and low-molecular weight (H-aggregate) nanofibers differ by ≈160 meV. This is consistent with shifts expected from H-type charge-transfer (CT) interactions that lower HOMO energies according to registration between thiophene moieties on adjacent polymer chains. These results show how KPFM combined with wavelength-resolved photoluminescence imaging can be used to extract information on "dark" (CT) interactions in polymer assemblies.

Keywords: H/J aggregates; Kelvin probe force microscopy; P3HT; interchain coupling; nanowires; photoluminescence; poly-3-hexylthiophene

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