Conducting Polymer based Field-Effect Transistor for Volatile Organic Compound Sensing

This work presents the sensing ability demonstrated by thiophene derivative in an OFET architecture. The detection ability of the fabricated device was tested in real-time for acetone at various intervals manifesting as variation in drain currents. 1x1 cm2 90 nm thermal oxide substrate were used for lithographically patterning of interdigitated source-drain structures with a channel length of 40um. A reduction in drain current by ~35% and charge carrier mobility by ~ 53% was observed attributed to the sensing action performed by thiophene derivative film by acetone vapor interaction. The photoluminescence spectra corroborate the specific interaction of acetone molecules with sensing element.