Low power AlGaN/GaN MEMS pressure sensor for high vacuum application

Low power AlGaN/GaN MEMS pressure sensor for high vacuum application

Sun, J. (TU Delft Electronic Components, Technology and Materials; Shenzhen Institute of Wide-bandgap Semiconductors)
Hu, D. (TU Delft Electronic Components, Technology and Materials)
Liu, Zewen (Tsinghua University)
Middelburg, L.M. (TU Delft Electronic Components, Technology and Materials)
Vollebregt, S. (TU Delft Electronic Components, Technology and Materials)
Sarro, Pasqualina M (TU Delft Electronic Components, Technology and Materials)
Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials)

2020

A micro-scale pressure sensor based on suspended AlGaN/GaN heterostructure is reported with non-linear sensitivity. By sealing the cavity, vacuum sensing at various temperatures was demonstrated. To validate the proposed concept of the AlGaN/GaN vacuum sensor, a 700 µm diameter circular membrane was electrically characterized under applied static and dynamic pressures at various temperatures ranging from 25 °C to 100 °C. The current change of the AlGaN/GaN heterostructure increased as the vacuum and temperature increases due to the increase of 2DEG density by tensile strain. The dynamic current change from 96 kPa down to 10 Pa of AlGaN/GaN heterostructure pressure sensor was 18.75 % at 100 °C. The maximum sensitivity reached 22.8 %/kPa with a power consumption of 1.8 µW. These results suggest that suspended AlGaN/GaN heterostructures are promising for high vacuum and high-temperature sensing applications.

AlGaN/GaN
MEMS
Pressure sensor
Vacuum

http://resolver.tudelft.nl/uuid:494e8519-2e5e-4951-bff7-12d8c4888441

https://doi.org/10.1016/j.sna.2020.112217

2021-01-26

0924-4247

Sensors and Actuators A: Physical: an international journal devoted to research and development of physical and chemical transducers, 314, 1-7

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2020 J. Sun, D. Hu, Zewen Liu, L.M. Middelburg, S. Vollebregt, Pasqualina M Sarro, Kouchi Zhang