Strain-Dependent Charge Transport of Stretchable Organic Semiconductors: Insights from Molecular Deformation Behaviors
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Stretchable organic semiconductors (OSCs) have emerged as promising materials for flexible electronics. However, the loss of electrical properties due to the mechanical deformation of OSC thin films remains an unresolved issue. To overcome this, achieving delicate control of thin film properties such as crystallinity, morphology, and charge transport properties during deformation remains a major challenge. I will present multiscale structural and electrical analyses aimed at maintaining electrical properties in deformed conjugated polymer (CP) films. Our study revealed that incorporating less rigid thiophene moieties between diketopyrrolopyrrole acceptors leads to strain-induced flattening of polymer chains. This not only softens the film but also improves hole mobility by up to 180% under 80% tensile strain. These findings improve our understanding of strain-dependent charge transport of stretchable CPs, with potential benefits for future development of flexible electronic devices.