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Charge conductivity in donor–acceptor polymer dispersions measured with time-resolved terahertz spectroscopy

Published

Author(s)

Timothy J. Magnanelli, Edwin J. Heilweil

Abstract

Ultrafast Time-Domain and Time-Resolved Terahertz (TDS/TRTS) spectroscopic methods are utilized to explore photoconductive properties of conjugated donor-acceptor co-polymers dispersed in room temperature toluene, a nonpolar dielectric solvent. TRTS provides an effective non-contact handle to interrogate localized relative conductivity of dispersed co-polymers. Conductivity dynamics are contrasted among disparate polymer structures and between their photoconductive peak and thermalized time-delayed signatures. Relative levels of real/imaginary conductivity, photoconductive kinetics, and carrier properties are summarized. Molecular orbital pictures and donor-acceptor twisting mode frequencies ascertained through ab initio calculations (via Density Functional Theory) support descriptions of the relative efficacies of charge transfer from the perspective of the localized THz method.
Citation
Chemical Physics
Volume
540

Keywords

donor-acceptor polymers, liquid dispersions, localized conductivity, time-resolved terahertz, ultrafast THz spectroscopy

Citation

Magnanelli, T. and Heilweil, E. (2020), Charge conductivity in donor–acceptor polymer dispersions measured with time-resolved terahertz spectroscopy, Chemical Physics, [online], https://doi.org/10.1016/j.chemphys.2020.111005 (Accessed September 21, 2021)
Created October 4, 2020, Updated October 28, 2020