Relation between Microstructure and Charge Transport in Polymers of Different Regioregularity

David P. McMahon, David L. Cheung, Ludwig Goris, Javier Dacuña, Alberto Salleo, Alessandro Troisi

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

A methodology to link an atomistic description of a polymeric semiconductor with the experimental electrical characteristics of real devices is proposed. Microscopic models of poly(3-hexylthiophene) (P3HT) of different regioregularity are generated using molecular dynamics and their electronic structure determined via an approximate quantum chemistry scheme. The resulting density of trap states and distribution of localized and delocalized states is then compared with that obtained from thin film transistor measurements of P3HT at different regioregularities. The two complementary methodologies provide a converging description of the electron transport in semicrystalline P3HT and the role of regioregularity. States at the valence band edge are localized, but delocalized "band-like" states are thermally accessible and quantitatively characterized. Both theory and experiment agree that contrary to a commonly held belief the trap density and the DOS shape are little affected by the presence of regioregularity defects. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)19386-19393
Number of pages8
JournalThe Journal of Physical Chemistry C
Volume115
Issue number39
DOIs
StatePublished - Sep 9 2011
Externally publishedYes

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