Abstract
Abstract Ultrafast Time-Domain and Time-Resolved Terahertz (TDS/TRTS) spectroscopic methods are utilized to explore photoconductive properties of five conjugated donor–acceptor co-polymers (PCDTPT, CDTBTZ, IDTBT, PBDTTPD and N2200) 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. Photoconductivity kinetics, relative levels of real/imaginary conductivity, and carrier properties are summarized with higher energy photoexcitation increasing the real photoconductivity by up to three-fold. 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.
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