Molecular Weight Dependent Structure and Charge Transport in MAPLE-Deposited Poly(3-Hexylthiophene) Thin Films

Ban Xuan Dong, Mitchell Smith, Joseph Strzalka, Huanghe Li, Anne J. McNeil, Gila E. Stein, Peter F. Green

    Research output: Contribution to journalArticlepeer-review

    14 Scopus Citations

    Abstract

    In this work, poly(3-hexylthiophene) (P3HT) films prepared using the matrix-assisted pulsed laser evaporation (MAPLE) technique are shown to possess morphological structures that are dependent on molecular weight (MW). Specifically, the structures of low MW samples of MAPLE-deposited film are composed of crystallites/aggregates embedded within highly disordered environments, whereas those of high MW samples are composed of aggregated domains connected by long polymer chains. Additionally, the crystallite size along the side-chain (100) direction decreases, whereas the conjugation length increases with increasing molecular weight. This is qualitatively similar to the structure of spin-cast films, though the MAPLE-deposited films are more disordered. In-plane carrier mobilities in the MAPLE-deposited samples increase with MW, consistent with the notion that longer chains bridge adjacent aggregated domains thereby facilitating more effective charge transport. The carrier mobilities in the MAPLE-deposited simples are consistently lower than those in the solvent-cast samples for all molecular weights, consistent with the shorter conjugation length in samples prepared by this deposition technique.

    Original languageAmerican English
    Pages (from-to)652-663
    Number of pages12
    JournalJournal of Polymer Science, Part B: Polymer Physics
    Volume56
    Issue number8
    DOIs
    StatePublished - 2018

    Bibliographical note

    Publisher Copyright:
    © 2018 Wiley Periodicals, Inc.

    NREL Publication Number

    • NREL/JA-5A00-71050

    Keywords

    • conjugated polymers
    • GIWAXS
    • MAPLE
    • molecular weight dependence
    • UV–vis absorption

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