Differentiation of Electric Response in Highly Oriented Regioregular Poly(3-hexylthiophene) under Anisotropic Strain.

Exploring flexible and stretchable conjugated polymer devices has garnered particular attention. This work provides a new technology to improve the electrical properties in a stretching process by skillfully assisting the anisotropic tensile properties of oriented regioregular poly(3-hexylthiophene) (P3HT) films. Oriented P3HT films with a long-range ordered chain alignment are fabricated, and stretchable conducting films are achieved by laminating oriented P3HT films and polydimethylsiloxane (PDMS) layers. The differentiation of electrical response is identified when the film is under different stretching directions. The electrical stability of the P3HT film during the stretching process is much better when the stretching direction is perpendicular than along the c-axis of the P3HT film. Moreover, the multiscale structure evolution of P3HT films under stretching is explored. The technology based on oriented conductive polymers under anisotropic stretching condition provides not only a new strategy for fabricating high-quality stretchable devices but also theoretical guidance for studying the mechanical properties for the aligned conjugated film.