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Molecular Interactions and Ordering in Electrically Doped Polymers: Blends of PBTTT and F4TCNQ

Journal Article · · Macromolecules
DOI:https://doi.org/10.1021/ma501547h· OSTI ID:1158571
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2]
  1. Univ. of California, Santa Barbara, CA (United States); University of California Santa Barbara
  2. Univ. of California, Santa Barbara, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
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Identifying how small molecular acceptors pack with polymer donors in thin and thick (bulk) films is critical to understanding the nature of electrical doping by charge transfer. In this study, the packing structure of the molecular acceptor tetrafluorotetracyanoquinodimethane (F4TCNQ) with the semiconducting polymer poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno-[3,2-b]thiophene) (PBTTT-C14) is examined. A combination of solid-state NMR, synchrotron X-ray scattering, and optical spectroscopy was used to determine the packing motif for blends of PBTTT-C14 and F4TCNQ in thin and bulk films. These results indicate that F4TCNQ and PBTTT-C14 order in a cofacial arrangement where charge transfer is near 100% efficient in the solid state. These results provide crucial insights into the structures and compositions of ordered domains in doped semiconducting polymers and suggest a model for the microstructure where the location of the molecular acceptors are correlated rather than randomly dispersed.
Research Organization:
Univ. of California, Santa Barbara, CA (United States); Stanford Synchrotron Radiation Lightsource, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
DOE Contract Number:
SC0005414
OSTI ID:
1158571
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 19 Vol. 47; ISSN 0024-9297
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
polymers
thermoelectric
x-ray scattering
synchrotron x-ray