Harnessing Thin-Film Polymorphism via Regulating Conjugated Polymer-Solvent Interactions for Organic Field-Effect Transistors.
basic_science · Level V
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- Record sourced from PubMed, PMID 41919464.
- Also identified by DOI 10.1021/acs.nanolett.6c00367.
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Abstract
Tailoring the polymorphism of conjugated polymers is a promising strategy to enhance the performance of optoelectronic devices. However, a comprehensive understanding of the formation and transformation mechanisms of these polymorphisms remains limited. Herein, we correlate, for the first time, thin-film polymorphisms of poly(3-hexylselenophene) (P3HS) with their solution-state polymer-polymer and polymer-solvent interactions by quantifying the second virial coefficient (<i>A</i><sub>2</sub>). P3HS exhibits weak aggregation in toluene, where <i>A</i><sub>2</sub> is positive and polymer-solvent interactions dominate. The fast toluene evaporation kinetically traps these weak aggregates in polymorph I in the film. In contrast, P3HS aggregates strongly in <i>p</i>-xylene, where <i>A</i><sub>2</sub> is negative and polymer-polymer interactions prevail. The slower evaporation of <i>p</i>-xylene promotes the formation of polymorph II. P3HS polymorphs greatly affect their charge transport characteristics, with higher mobility observed in polymorph I. This study highlights a direct connection among different molecular interactions, solution aggregates, and thin-film polymorphisms of conjugated polymers.