Chain-assisted charge transport in semicrystalline conjugated polymers

B. O. Conchuir, C. Tarantini, C. R. McNeill, S. Hüttner, A. Zaccone

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Charge-carrier transport in a paradigmatic semicrystalline polymer semiconductor (P3HT) is important for both fundamental understanding and applications. In samples with enhanced structural disorder due to ad-hoc point defects, the mobility displays rich behavior as a function of electric field (F) and temperature (T). At low T, the mobility increases with the applied field, but upon further increasing T, the field-dependence becomes shallower. Eventually, at the highest T considered, the slope changes sign and the mobility then decreases with the field. This phenomenon can be interpreted with our model as a result of the competition between intrachain conductive-like transport (which slows on increasing F) and interchain activated transport (which is faster at higher F). The former is controlling at high T where interchain hops are strictly limited to nearest-neighbor monomers on adjacent chains. At low T, instead, interchain hops to distant sites are allowed and control the positive correlation of the mobility with the field.

Original languageEnglish
Pages (from-to)14539-14548
Number of pages10
JournalJournal of Physical Chemistry C
Volume120
Issue number27
DOIs
Publication statusPublished - 14 Jul 2016

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