Lithium Solid Electrolyte-Gated Oxide Transistors-Based Schmitt Trigger With High Thermal Resistance

Electrolyte-gated transistors (EGTs) can operate at very low voltages owing to their large electric-double-layer capacitance. However, the evaporation of water in the electrolyte can lead to electrolyte failure in harsh high-temperature environments resulting in a decrease in the electrical performance of EGTs. Meanwhile, oxide-based lithium solid-state electrolytes exhibit excellent thermal stability due to high oxygen loss and thermal decomposition temperature. In this work, we utilized LiPON solid-state electrolytes as the gate dielectrics to fabricate a high-temperature resistant EGT, which achieved high mobility of 32.87 cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> V<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> s<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> under 393 K. Moreover, we developed a Schmitt trigger due to the large hysteresis window of the LiPON EGT at high temperatures. The switching speed and shape pulse wave ability of the Schmitt trigger have been improved compared to room temperature. These findings offer high-temperature applications of LiPON electrolyte in electrochemical sensors and neuromorphic systems.