We fabricated the organic field-effect transistors (OFETs) integrating C8-BTBT single crystalline microribbon arrays as the organic semiconductor. A low temperature (60°C) annealed ultrathin CYTOP buffer layer was inserted between the semiconductor and the electrodes to improve the performance of the OFETs. The charge mobility was increased from 1.7 to 3.6 cm2 V-1 s-1 through inserting the buffer layer. The performance enhancement was attributed to the significant decrease of the large contact resistance of the OFETs caused by the thick C8-BTBT single crystalline microribbons, which was reduced from 1.6 to 0.14 MΩ cm by inserting CYTOP buffer layer with thickness of 6 nm. Meanwhile, the CYTOP buffer layer not only protected the C8-BTBT single crystalline microribbon arrays from the harm of electrode evaporation, but also had no destructive effect on the C8-BTBT active layer. The outstanding results show an effective method of reducing the contact resistance to improve the performance of OFETs.
Bottom-gated, top-contact organic field effect transistors (OFET) based nitrogen oxide (NO2) gas sensors were fabricated by incorporating a hybrid organic semiconducting (OSC) layer, which consisting of 6, 13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) and Graphene Oxide (GO). By carefully optimizing the proportion of GO in the OSC layer, a tremendous improvement of sensing performance was obtained when exposed to NO2 analyte. Compared with OFET devices based on pure TIPS-pentacene OSC layer, the sensitivity of OFET sensors with hybrid OSC layer had a tenfold enhancement. By analyzing the semiconducting layer through utilizing X-ray diffraction (XPS) and atomic force microscope (AFM), the enhanced sensing performance was attributed to the absorption of the NO2 gas molecules through a porous OSC layer and a preferable interaction between functional groups on the edge of GO sheets and NO2 gas molecules. The improved sensing performance by the hybrid OSC layer also suggests the possibility of GO for the further application in high performance OFET based gas sensors.
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