NTCDA Organic Thin-Film-Transistor as Humidity Sensor: Weaknesses and Strengths
15 June 2001
1,4,5,8-Naphthalene-TetraCarboxylic-Dianhydride (NTCDA) organic thin film transistors employed as humidity sensors exhibit higher performance level compared to NTCDA chemiresistors. In particular, the transistor on-current exhibits higher values and a larger dynamic range as well as a better reversibility, compared to the response of an NTCDA resistor. On the basis of the FT-IR spectra of NTCDA humid and anhydrous thin films a model for the NTCDA/H sub 2 O system is proposed which eventually explains the variation of NTCDA thin film transistor parameters while the device is exposed to changing water vapor atmosphere.