Fabrication of micro heaters on polycrystalline 3C-SiC suspended membranes for gas sensors and their characteristics
This paper describes the design, fabrication, and characteristics of micro heaters mad on AlN (0.1?m)/3C-SiC (1?m) suspended membranes using surface micromachining technology. 3C-SiC and AlN thin films, which have a large energy band gap and very low lattice mismatch, were used for high-temperature environments. A Pt thin film was used as micro heaters and temperature sensor materials. The resistance of the temperature detector (RTD) and the power consumption of the micro heater were measured and calculated. The heater is designed for an operating temperature up to about 800C and can be operated at about 500C with a power of 312mW. The thermal coefficient of the resistance (TCR) of fabricated Pt RTDs is 3174.64ppm/C. The thermal distribution measured by IR thermovision is uniform across the membrane surface.
micro heater polycrystalline 3c-sic aln pt mems