Abstract
Herein, we report two novel donor-acceptor copolymers, PFDTE1 and PFDTE2, based on (E)-1,2-bis(3-fluorothiophen-2-yl)ethene (FDTE) moiety. X-ray diffraction crystallography indicated that F⋯H hydrogen bonds exist in single FDTE unit. Theoretical simulation results revealed that the FDTE unit owns increased torsional potential due to the presence of fluorine-induced intramolecular noncovalent interactions. The two copolymers exhibited ambipolar carrier transport characteristics, with hole/electron mobilities of 4.24/0.30 cm2 V−1 s−1 for PFDTE1 and 5.42/0.36 cm2 V−1 s−1 for PFDTE2. The complementary-like inverters based on PFDTE2 were also successfully fabricated and showed high gain values of 104 and 115, respectively, providing potential in ambipolar complementary-like inverters. AFM and 2D-GIXRD analyses revealed that the two copolymers formed lamellar, edge-on molecular packing, and crystalline thin films with small π–π stacking distances down to 3.55 Å.
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