All solution processed flexible ammonia gas and light sensors based on alpha,omega-hexyl-distyrylbithiophene films

作者：Fiorido T; Bendahan M^*; Aguir K; Bernardini S; Martini C; Brisset H; Fages F; Videlot Ackermann C; Ackermann J

来源：Sensors and Actuators B: Chemical , 2010, 151(1): 77-82.

DOI：10.1016/j.snb.2010.09.048

• Organic based sensors
• Gas sensor
• Photosensitive sensor
• Flexible organic sensors

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.

• 出版日期2010-11-26