Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 56, Issue 8, Pages 652-662Publisher
WILEY
DOI: 10.1002/polb.24588
Keywords
conjugated polymers; GIWAXS; MAPLE; molecular weight dependence; UV-vis absorption
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Funding
- Vietnam Education Foundation
- University of Michigan
- National Science Foundation (NSF), Division of Materials Research [DMR-1305749]
- Army Research Office [W911NF-12-1-0214]
- National Science Foundation [DMR-1151468]
- U.S. Department of Energy (DOE) by Argonne National Laboratory [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1731292] Funding Source: National Science Foundation
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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. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 652-662
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