Synthesis and Characterization of a 2,4,6-Tri(2-thienyl)pyridine-Based Conjugated Polymer for OFET Applications

2,4,6-Tri(2-thienyl)pyridine is used to synthesize the new conjugated polymer PBDTTPy for OFET applications. The concept of introducing electron-deficient pyridine repeating units and meta-linked structures into a conjugated polymer to reduce its HOMO energy level and thereby increase its ambient stability is tested. The absorption spectrum of the polymer thin film displays a large bathochromic shift compared with its solution absorption spectrum. The polymer PBDTTPy shows a typical amorphous structure in the solid state. The first OFET device based on a conjugated polymer with meta-linked trithienylpyridine units is reported. PBDTTPy exhibits p-type transport under ambient conditions in a bottom-gate, top-contact OFET device with a mobility of 2.4 x 10-4 cm2 V-1 s-1.