Performance Evaluation and Analysis of Hybrid Bilayer Dielectrics Based OTFTs for Temperature Sensing Application

In this work, a comprehensive performance evaluation of a temperature sensor utilizing an organic thin-film transistor (OTFT) with hybrid bilayer dielectric layer polyvinyl alcohol (PVA)/high K inorganic dielectrics is presented. The temperature sensor elucidates the temperature-dependent characteristics of organic thin-film transistors (OTFTs) employing various bilayer dielectrics. It specifically describes the alterations in the drain current of these transistors with temperature. This inherent property of OTFTs makes them highly suitable for accurate and reliable temperature-sensing applications. Electrical parameters of the OTFT devices are determined at different temperatures (300 K and 350 K) which include subthreshold swing (SS), off current (I-off), current on-off ratio (I-on/I-off), and on-current (I-on). OTFT characteristics vary at two different temperatures, highlighting their potential use as temperature sensors. The temperature sensor shows its highest sensitivity, reaching 149.10% for PVA/(SrZrO3) bilayer dielectric at V-DS = -10 V.