Design and Modeling of Micromechanical GaAs based Hot Plate for Gas Sensors

TL;DR

This paper presents the design, simulation, and fabrication of GaAs-based micromechanical hot plates for gas sensors, aiming to improve sensitivity, reduce power consumption, and enhance thermal response.

Contribution

It introduces a novel GaAs micromachined thermal converter design that offers high thermal isolation and mechanical stability for gas sensing applications.

Findings

Successful simulation of GaAs hot plates.

Fabrication of prototype devices.

Improved thermal response and low power operation.

Abstract

For modern Gas sensors, high sensitivity and low power are expected. This paper discusses design, simulation and fabrication of new Micromachined Thermal Converters (MTCs) based on GaAs developed for Gas sensors. Metal oxide gas sensors generally work in high temperature mode that is required for chemical reactions to be performed between molecules of the specified gas and the surface of sensing material. There is a low power consumption required to obtain the operation temperatures in the range of 200 to 500 oC. High thermal isolation of these devices solves consumption problem and can be made by designing of free standing micromechanical hot plates. Mechanical stability and a fast thermal response are especially significant parameters that can not be neglected. These characteristics can be achieved with new concept of GaAs thermal converter.