ИСТИНА

In this work, the influence of terminal alkyl group length on electrical and sensory properties was thoughtfully investigated. The devices investigated demonstrate typical p-type behavior with extracted charge carrier mobilities, threshold voltages, and on–off ratios in the range of 10−5–10−2 cm2 V−1 s−1, −24 to +14 V, and 102–107, respectively. Corresponding dependences on terminal alkyl group length are showed at Picture 1.Clear difference in the trends in the growth of electrical and gas-sensitive properties with a terminal group length increasing leads to the conclusion that the sensory properties of the OFETs are weakly related to its electrical characteristics. Further morphology investigation demonstrated that sensory properties of the device mostly dependent on semiconducting layer morphology and the best properties were obtained at the devices based on dimer with octyl terminal group with the smoothest and uniform active layer.