Investigation into the Sensing Process of High‐Performance H₂S Sensors Based on Polymer Transistors

Abstract

Abstract Herein a H 2 S sensor based on a polymer field‐effect transistor is reported and the sensor shows high sensitivity, excellent selectivity, fast response, and good operational stability. A concentration as low as 1 ppb H 2 S is detectable, which is to date the most sensitive H 2 S sensor based on organic semiconducting film. Thinning the thickness of active layer does not necessarily improve the sensitivity, but rather leads to the reduction of performance if the thickness is too low. Further analysis proposes a mechanism that the changing rate of absorption and desorption of H 2 S molecules is different when the thickness of active layer varies, indicating the necessity for thickness optimization.