Face-on reorientation of π-conjugated polymers in thin films by surface-segregated monolayers

Wei Chih Wang, Sheng Yuan Chen, Yaw Wen Yang*, Chain Shu Hsu*, Keisuke Tajima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A new π-conjugated polymer based on naphthalenediimide with a branched semifluoroalkyl side chain (FNDIT2) was synthesized and used to change the polymer orientations in thin films. X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy revealed that FNDIT2 spontaneously forms surface-segregated monolayers in blend films with other π-conjugated polymers to adopt a preferred face-on orientation, with the π-plane of the polymer aligned more parallel to the surface. Thermal annealing of the films induced further reorientation of the polymers inside the films closer to the face-on orientation, as shown by two-dimensional grazing-incidence wide-angle X-ray scattering. The induced face-on orientations in the films led to higher charge mobility in the vertical direction. This study provides a general and versatile strategy to control the molecular orientation in thin films and enhance the performance of thin-film organic electronics.

Original languageEnglish
Pages (from-to)6268-6275
Number of pages8
JournalJournal of Materials Chemistry A
Volume8
Issue number13
DOIs
StatePublished - 7 Apr 2020

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