Abstract
An ordered arrangement of electron-accepting molecular dopant, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), in three-dimensionally (3D) oriented poly(3-hexylthiophene) (P3HT) film was clarified. The 3D oriented P3HT thin films prepared by the friction-transfer technique were doped with F4TCNQ by dipping into an acetonitrile solution. The presence of F4TCNQ anions in the 3D oriented P3HT thin films was investigated by polarized ultraviolet/visible/near-infrared absorption spectroscopy, grazing incidence X-ray diffractometry, polarized Fourier transform infrared spectroscopy (FT-IR), and infrared p-polarized multiple-angle incidence resolution spectroscopy (pMAIRS). The F4TCNQ-doped 3D oriented P3HT films showed anisotropic properties in all characterizations. In particular, the anisotropic molecular vibrations from polarized FT-IR and pMAIRS have clearly revealed orientations of polymeric chains and molecular dopant molecules. Considering the results from several independent techniques indicated that F4TCNQ anions in the 3D oriented P3HT were orderly arranged in a 3D manner with respect to the 3D oriented P3HT such that their molecular long-axis parallel to the P3HT backbone, with in-plane molecular orientation. Additionally, the direction of the optical transition moment of the F4TCNQ anion was found to be parallel to the molecular short-axis.
Highlights
Conjugated polymers (CPs) have shown their potentials as active materials for organic semiconducting devices, such as organic light-emitting diodes (OLEDs), organic thin-film transistors (OTFTs) and organic photovoltaics (OPVs) owing to their ability to tune the material properties and for the low-cost manufacturing of organic electronic devices by solution processing[1,2,3,4,5]
We investigated the ordered arrangement of the molecular acceptor, F4TCNQ, in 3D oriented P3HT prepared by the friction-transfer method utilizing polarized UV–vis-NIR, grazing incidence X-ray diffraction (GIXD), polarized Fourier transform infrared (FT-IR), and polarized multiple-angle incidence resolution spectroscopy (pMAIRS) measurements
Acceptor doping was performed by simple dipping of 3D oriented P3HT thin films in an acetonitrile solution of F4TCNQ
Summary
Conjugated polymers (CPs) have shown their potentials as active materials for organic semiconducting devices, such as organic light-emitting diodes (OLEDs), organic thin-film transistors (OTFTs) and organic photovoltaics (OPVs) owing to their ability to tune the material properties and for the low-cost manufacturing of organic electronic devices by solution processing[1,2,3,4,5]. In such doped systems, F4TCNQ dopant molecules are expected to be arranged in 3D manner with respect to the 3D oriented friction-transferred P3HT film.
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