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

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

doi:10.1016/j.sna.2020.112217

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

Journal article (2020)

Authors

J. Sun Electronic Components, Technology and Materials - , Shenzhen Institute of Wide-bandgap Semiconductors

D. Hu Electronic Components, Technology and Materials -

Zewen Liu Tsinghua University

L.M. Middelburg Electronic Components, Technology and Materials -

S. Vollebregt Electronic Components, Technology and Materials -

Pasqualina M Sarro Electronic Components, Technology and Materials -

Kouchi Zhang Electronic Components, Technology and Materials -

Research Group

Electronic Components, Technology and Materials () (TU Delft)

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

MEMS AlGaN/GaN Pressure sensor Vacuum

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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

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.

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