Building Block for Organic Transistor Polymers

Benzo[1,2-b:4,5-b']dithiophene has emerged as an attractive building block for making conjugated polymers due to its large planar conjugated structure ideal for efficient π-π packing. For instance, Thiem et al. have reported the synthesis of the co-polymer using this compound as a starting material. According to their results, the field-effect transistor fabricated from this polymer has an On/Off ratio > 10⁷, a hole mobility of 1.4 x 10^-2 cm²V^-1s^-1, almost no hysteresis and a turn-on voltage around 0 V.