Open-Shell Donor–Acceptor Conjugated Polymers with High Electrical Conductivity

Huang, Lifeng; Eedugurala, Naresh; Benasco, Anthony; Zhang, Song; Mayer, Kevin S.; Adams, Daniel J.; Fowler, Benjamin; Lockart, Molly M.; Saghayezhian, Mohammad; Tahir, Hamas; King, Eric R.; Morgan, Sarah; Bowman, Michael K.; Gu, Xiaodan; Azoulay, Jason D.

doi:10.1002/adfm.201909805

Open-Shell Donor–Acceptor Conjugated Polymers with High Electrical Conductivity

Journal Article · Mon May 04 00:00:00 EDT 2020 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201909805· OSTI ID:1659437

Huang, Lifeng ^[1]; Eedugurala, Naresh ^[2]; Benasco, Anthony ^[2]; Zhang, Song ^[2]; Mayer, Kevin S. ^[2]; Adams, Daniel J. ^[2]; Fowler, Benjamin ^[3]; Lockart, Molly M. ^[3]; Saghayezhian, Mohammad ^[4]; Tahir, Hamas ^[2]; King, Eric R. ^[2]; Morgan, Sarah ^[2]; Bowman, Michael K. ^[3]; Gu, Xiaodan ^[2]; ^[2]

Univ. of Southern Mississippi, Hattiesburg, MI (United States); University of Southern Mississippi
Univ. of Southern Mississippi, Hattiesburg, MI (United States)
Univ. of Alabama, Tuscaloosa, AL (United States)
Louisiana State Univ., Baton Rouge, LA (United States)

Conductive polymers largely derive their electronic functionality from chemical doping, processes by which redox and charge-transfer reactions form mobile carriers. While decades of research have demonstrated fundamentally new technologies that merge the unique functionality of these materials with the chemical versatility of macromolecules, doping and the resultant material properties are not ideal for many applications. Here, it is demonstrated that open-shell conjugated polymers comprised of alternating cyclopentadithiophene and thiadiazoloquinoxaline units can achieve high electrical conductivities in their native “undoped” form. Spectroscopic, electrochemical, electron paramagnetic resonance, and magnetic susceptibility measurements demonstrate that this donor–acceptor architecture promotes very narrow bandgaps, strong electronic correlations, high-spin ground states, and long-range π-delocalization. A comparative study of structural variants and processing methodologies demonstrates that the conductivity can be tuned up to 8.18 S cm^-1. This exceeds other neutral narrow bandgap conjugated polymers, many doped polymers, radical conductors, and is comparable to commercial grades of poly(styrene-sulfonate)-doped poly(3,4-ethylenedioxythiophene). X-ray and morphological studies trace the high conductivity to rigid backbone conformations emanating from strong π-interactions and long-range ordered structures formed through self-organization that lead to a network of delocalized open-shell sites in electronic communication. The results offer a new platform for the transport of charge in molecular systems.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Southern Mississippi, Hattiesburg, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019361

OSTI ID:: 1659437

Alternate ID(s):: OSTI ID: 1617069
OSTI ID: 1774733
OSTI ID: 1985336

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 24 Vol. 30; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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