Role of Molecular Weight Distribution on Charge Transport in Semiconducting Polymers

Scott Himmelberger, Koen Vandewal, Zhuping Fei, Martin Heeney, Alberto Salleo

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

© 2014 American Chemical Society. Model semiconducting polymer blends of well-controlled molecular weight distributions are fabricated and demonstrated to be a simple method to control intermolecular disorder without affecting intramolecular order or degree of aggregation. Mobility measurements exhibit that even small amounts of low molecular weight material are detrimental to charge transport. Trends in charge carrier mobility can be reproduced by a simple analytical model which indicates that carriers have no preference for high or low molecular weight chains and that charge transport is limited by interchain hopping. These results quantify the role of long polymer tie-chains and demonstrate the need for controlled polydispersity for achieving high carrier mobilities.
Original languageEnglish (US)
Pages (from-to)7151-7157
Number of pages7
JournalMacromolecules
Volume47
Issue number20
DOIs
StatePublished - Oct 16 2014
Externally publishedYes

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