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Driving Force and Optical Signatures of Bipolaron Formation in Chemically Doped Conjugated Polymers.
Voss, Matthew G; Challa, J Reddy; Scholes, D Tyler; Yee, Patrick Y; Wu, Eric C; Liu, Xiao; Park, Sanghyun J; León Ruiz, Omar; Subramaniyan, Selvam; Chen, Mengdan; Jenekhe, Samson A; Wang, Xiaolin; Tolbert, Sarah H; Schwartz, Benjamin J.
Afiliação
  • Voss MG; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Challa JR; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Scholes DT; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Yee PY; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Wu EC; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Liu X; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Park SJ; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • León Ruiz O; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Subramaniyan S; Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
  • Chen M; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Jenekhe SA; Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
  • Wang X; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
  • Tolbert SH; Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Schwartz BJ; Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.
Adv Mater ; 33(3): e2000228, 2021 Jan.
Article em En | MEDLINE | ID: mdl-33296113
ABSTRACT
Molecular dopants are often added to semiconducting polymers to improve electrical conductivity. However, the use of such dopants does not always produce mobile charge carriers. In this work, ultrafast spectroscopy is used to explore the nature of the carriers created following doping of conjugated push-pull polymers with both F4 TCNQ (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) and FeCl3 . It is shown that for one particular push-pull material, the charge carriers created by doping are entirely non-conductive bipolarons and not single polarons, and that transient absorption spectroscopy following excitation in the infrared can readily distinguish the two types of charge carriers. Based on density functional theory calculations and experiments on multiple push-pull conjugated polymers, it is argued that the size of the donor push units determines the relative stabilities of polarons and bipolarons, with larger donor units stabilizing the bipolarons by providing more area for two charges to co-reside.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Adv Mater Ano de publicação: 2021 Tipo de documento: Article
Texto completo
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PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Adv Mater Ano de publicação: 2021 Tipo de documento: Article