Abstract
The aim of this study is to realize flexible photo- and gas sensors using low cost solution processing such as drop casting or ink jet printing. Two organic semiconductors, namely distyrylbithiophene (DS2T) and α,ω-hexyl-distyrylbithiophene (DH-DS2T), were used as active sensor materials. Both oligomers are p-type semiconductors with high mobility and good air stability. While DS2T has a poor solubility in common organic solvent and thus thin films could only processed by thermal evaporation, the highly soluble DH-DS2T allowed the fabrication of all solution processed photo- and gas sensors. The sensor responses were studied by measuring the current through the semiconductor organic film as a function of light intensity (from 2 mW/cm 2 to 100 mW/cm 2) and ammonia gas concentration (NH 3: 25, 50, and 100 ppm) for light and gas sensors, respectively. We demonstrate here that both compounds have efficient sensor responses, Especially the use of DH-DS2T leads to an efficient fully solution processed multifunctional sensor on flexible substrate.
Published Version
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