Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 151, Issue 1, Pages 77-82Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.09.048
Keywords
Organic based sensors; Gas sensor; Photosensitive sensor; Flexible organic sensors
Funding
- Fonds Social Europeen (FSE)
- MICROPOLY project
- CapGoss project (REGION PACA)
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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 alpha,omega-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 (NH3: 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. (C) 2010 Elsevier B.V. All rights reserved.
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