Abstract
In this work, thermally evaporated organic thin-film transistors (OTFTs) based on a naphthalene diimide derivative (NTCDI-C13) were fabricated and the contact doping process with cesium fluoride (CsF) was investigated. The OTFTs incorporated a polymer dielectric layer (CYTOPTM), which contributed to the suppression of 3D needle-like NTCDI-C13 crystallite formation during the evaporation process. The results demonstrated that the combination of CsF and CYTOP markedly improved the devices, resulting in an intrinsic mobility of 0.3 cm2/Vs and a threshold voltage of 10 V. The stability of the devices was also investigated under ambient atmospheric conditions. The TFTs exhibited minimal performance loss, and it was observed that there was potential overestimation of the mobilities after a few minutes in ambient air.
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