Improving molecular structure in polythiophene thin films by solvent dipping post-treatment

We systematically studied a simple post-treatment method for improving the structural and electrical characteristics of dip-coated poly(3-hexylthiophene) (P3HT) thin films through direct dipping into a solvent. The molecular structure and electrical and optical properties of the P3HT thin films were...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-06, Vol.247, p.122878, Article 122878
Main Authors: Lee, Jeong Ik, Park, Yeong Don
Format: Article
Language:English
Subjects:
Dipping post-treatment
Electrical properties
Film thickness
Immersion coating
Molecular structure
Optical properties
Optimization
OTFT
Polythiophene
Solubility parameter
Solubility parameters
Solvents
Thin films
Xylene
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Summary:We systematically studied a simple post-treatment method for improving the structural and electrical characteristics of dip-coated poly(3-hexylthiophene) (P3HT) thin films through direct dipping into a solvent. The molecular structure and electrical and optical properties of the P3HT thin films were greatly influenced by the solubility parameter differences between P3HT and the post-treatment solvents. The post-treatment with xylene substantially improved the crystallinity and enhanced the electrical properties in the P3HT thin film, although film thickness decreased. Through optimization of the solubility parameter differences between P3HT and post-treatment solvents, device performance was improved by an appropriate combination of reduced film thickness and improved molecular structure. [Display omitted] •A solvent dipping post-treatment improved the molecular structure of a polymer film within a short period.•A more crystalline structure and preferred molecular orientation in P3HT film were obtained via post-treatment with xylene.•The improved molecular structure in P3HT film enhanced their charge-carrier transport.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.122878