Abstract:
Three-component random copolymers having different
ratios of [1]benzothieno[3,2-b]benzothiophene (BTBT) and diketopyrrolopyrrole
(DPP) units were synthesized, and their application in
organic field effect transistors (OFET) has been discussed. These low
band gap polymers exhibit p-type semiconducting properties, and it has
been observed that increase in the percentage composition of the fused
chalcogenophene (BTBT) in the polymer backbone significantly
improves the charge carrier mobility (μh) up to 2.47 cm2 V−1 s−1.
The GIXRD technique and AFM have been used to explain the
influence of BTBT on the nature of molecular packing in the polymer
thin films. These results unveil the role of the effective conjugation
length as well as the intermolecular ordering of the polymer chains on
the charge carrier transport in OFET
