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Polarization Dependence of Charge Conduction in Conjugated Polymer Films Investigated with Time-Resolved Terahertz Spectroscopy.
Magnanelli, Timothy J; Engmann, Sebastian; Wahlstrand, Jared K; Stephenson, John C; Richter, Lee J; Heilweil, Edwin J.
Afiliación
  • Magnanelli TJ; Physical, Measurement Laboratories, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
  • Engmann S; Physical, Measurement Laboratories, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
  • Wahlstrand JK; Theiss Research, La Jolla, CA, 92036, USA.
  • Stephenson JC; Physical, Measurement Laboratories, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
  • Richter LJ; Physical, Measurement Laboratories, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
  • Heilweil EJ; Material, Measurement Laboratories, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
J Phys Chem C Nanomater Interfaces ; 124(13)2020.
Article en En | MEDLINE | ID: mdl-38680539
ABSTRACT
Room temperature Time-Domain Terahertz (TDS) and Time-Resolved Terahertz (TRTS) spectroscopic methods are employed to measure carrier mobility and charge generation efficiency in thin-film semiconductor polymers. Interrogation of the dependence on excitation and probe polarizations yields insight into the underlying material properties that guide charge transport. We apply THz polarization anisotropy probes to analyze charge conduction in preparations of the copolymer PCDTPT, consisting of alternating cyclopenta-dithiophene (donor) and thiadiazolo-pyridine (acceptor) units. Comparisons are made among films of different ordering and morphology, including aligned films prepared by blade coating, a near isotropic dropcast film, and isotropic liquid dispersion. They are further contrasted with their population dynamics ascertained through transient absorption and the traditional photoconductive polymer poly-3-hexylthiophene (P3HT). Polarization anisotropy is observed as preferential charge conduction along the backbone propagation direction of PCDTPT, with various factors disproportionately influencing directional mobility and charge pair yield. PCDTPT exhibits unexpectedly strong conductivity when isolated in toluene dispersion. Quantitative comparisons yield a better understanding of polaron/free-charge relaxation and transfer mechanisms and illustrate dynamics among photoexcited charge carriers and their motion and diffusion through different material morphologies.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Chem C Nanomater Interfaces Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Chem C Nanomater Interfaces Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos