ИСТИНА

In this work, the properties of OFETs based on BTBT dimer with different terminal alkyl group length were 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 (typical transfer curves are shown in Fig.1a). Such devices demonstrated good sensitivity to NO2 – up to 134%/ppm (typical response curves are shown a Fig.1b). At the same time, morphology investigation showed that devices with smooth and uniform morphology demonstrated better sensory properties. Probably, this is the reason why dependence of the device sensitivity on terminal alkyl group length is not monotonical. It also worth to mentioned that more investigations will be done in future to check if such morphology influence is common for other analytes.