Inversion of Circular Dichroism Signals in Chiral Polythiophene Films Induced by End-On-Oriented Surface-Segregated Monolayers

A chiral polythiophene surfactant based on poly­(3-(S)-2-methylbutylthiophene) ((S)-P3MBT) with a semifluoroalkyl group at one end of the main chain was synthesized and used to form surface-segregated monolayers (SSMs). Films of pure (S)-P3MBT mainly adopted the edge-on orientation, whereas (S)-P3MB...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2021-02, Vol.13 (6), p.7510-7516
Main Authors: Wang, Fanji, Nakano, Kyohei, Segawa, Hiroshi, Tajima, Keisuke
Format: Article
Language:English
Subjects:
Organic Electronic Devices
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Summary:A chiral polythiophene surfactant based on poly­(3-(S)-2-methylbutylthiophene) ((S)-P3MBT) with a semifluoroalkyl group at one end of the main chain was synthesized and used to form surface-segregated monolayers (SSMs). Films of pure (S)-P3MBT mainly adopted the edge-on orientation, whereas (S)-P3MBT films with a SSM of the polymer surfactant (S)-P3MBT-F17 contained a large proportion of end-on-oriented polythiophene, both at the surface and inside the films. The thin films with the SSM showed circular dichroism signals, with the sign opposite to those observed in (S)-P3MBT films. These findings suggest that the orientation-controlled SSM layers induced changes in the packing of the polymer aggregates in the films, resulting in a dramatic change in the excitonic interactions of the chiral semiconducting polymers.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.0c22099