skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on February 6, 2019

Title: Molecular weight dependent structure and charge transport in MAPLE-deposited poly(3-hexylthiophene) thin films

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.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [4] ; ORCiD logo [5] ; ORCiD logo [6] ; ORCiD logo [7]
  1. Department of Materials Science and Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor Michigan 48109
  2. Department of Chemistry, University of Michigan, Ann Arbor Michigan 48109
  3. X-Ray Science Division, Argonne National Laboratory, Argonne Illinois 60439
  4. Macromolecular Science and Engineering, University of Michigan, Ann Arbor Michigan 48109
  5. Department of Chemistry, University of Michigan, Ann Arbor Michigan 48109; Macromolecular Science and Engineering, University of Michigan, Ann Arbor Michigan 48109
  6. Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville Tennessee 37996
  7. Department of Materials Science and Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor Michigan 48109; Macromolecular Science and Engineering, University of Michigan, Ann Arbor Michigan 48109; National Renewable Energy Laboratory, 15013 Denver W Pkwy, Golden Colorado 80401
Publication Date:
Report Number(s):
NREL/JA-5A00-71050
Journal ID: ISSN 0887-6266
Grant/Contract Number:
AC36-08GO28308; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Polymer Science. Part B, Polymer Physics
Additional Journal Information:
Journal Volume: 56; Journal Issue: 8; Journal ID: ISSN 0887-6266
Publisher:
Wiley
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF) - Directorate for Mathematical and Physical Sciences Division of Materials Research (MPS-DMR); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; Vietnam Education Foundation
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; conjugated polymers; GIWAXS; MAPLE; molecular weight dependence; UV-vis absorption; structure-transport relationship
OSTI Identifier:
1426766
Alternate Identifier(s):
OSTI ID: 1424899