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Pristine Poly(para-phenylene): Relating Semiconducting Behavior To Kinetics Of Precursor Conversion

Karl-Philipp Strunk, A. Abdulkarim, S. Beck, T. Marszalek, J. Bernhardt, Silke Koser, W. Pisula, D. Jaensch, J. Freudenberg, A. Pucci, U. Bunz, C. Melzer, K. Müllen
Published 2019 · Materials Science, Medicine

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We investigated unsubstituted poly(para-phenylene) (PPP), a long-desired prototype of a conjugated polymer semiconductor. PPP was accessed via thermal aromatization of a precursor polymer bearing kinked, solubility-inducing dimethoxycyclohexadienylene moieties. IR spectroscopy and Vis ellipsometry studies revealed that the rate of conversion of the precursor to PPP increases with temperature and decreases with film density, indicating a process with high activation volume. The obtained PPP films were analyzed in thin-film transistors to gain insights into the interplay between the degree of conversion and the resulting p-type semiconducting properties. The semiconducting behavior of PPP was further unambiguously proven through IR and transistor measurements of molybdenum trioxide p-doped films.
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