Fig. 2. Characterization of stretchable terpolymers.

a UV-Vis/NIR absorption spectra of the 30 nm-thick terpolymer films prepared by spin coating from chlorobenzene followed by drying at 150 °C for 15 min. b Activation energy for charge transport of DPP-0TVT, 8TVT, and 10TVT. The activation energy was extracted from the slope. μ is the charge carrier mobility extracted from saturation mobility of transistor measurements. c DSC second scan of DPP-0TVT, 8TVT, and 10TVT. d GIXD images of thin films (30 nm) of DPP-0TVT, 8TVT, and 10TVT. DPP-8TVT clearly showed higher-order diffraction peaks with smaller intensity. The color scale of the GIXD images represents relative diffraction intensity. e Diffraction intensity along Q_z direction vs. Q-values for terpolymers from GIXD measurements. f Relative degree of crystallinity (rDoC) of the terpolymers, which was calculated based on (2 0 0) peaks. g Lamellar stacking distance change under strain. h rDoC change under strain.