Capacitance pressure sensor based on GaN high-electron-mobility transistor-on-Si membrane

B. S. Kang, J. Kim, S. Jang, F. Ren, J. W. Johnson, R. J. Therrien, P. Rajagopal, J. C. Roberts, E. L. Piner, K. J. Linthicum, S. N.G. Chu, K. Baik, B. P. Gila, C. R. Abernathy, S. J. Pearton

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The changes in the capacitance of the channel of an AlGaN/GaN high-electron-mobility transistor (HEMT) membrane structure fabricated on a Si substrate were measured during the application of both tensile and compressive strain through changes in the ambient pressure. The capacitance of the channel displays a change of 7.19±0.45 × 10 -3 pF/μm as a function of the radius of the membrane at a fixed pressure of +9.5 bar and exhibits a linear characteristic response between -0.5 and +1 bar with a sensitivity of 0.86 pF/bar for a 600 μm radius membrane. The hysteresis was 0.4% in the linear range. These AlGaN/GaN HEMT membrane-based sensors appear to be promising for both room-temperature and elevated-temperature pressure-sensing applications.

Original languageEnglish
Article number253502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 2005
Externally publishedYes

Bibliographical note

Funding Information:
The work at UF is partially supported by AFOSR (F49620-02-1-0366, G. Witt, and F49620-03-1-0370), NSF (CTS-0301178, monitored by Dr. M. Burka and Dr. D. Senich), by NASA Kennedy Space Center Grant NAG 10-316 monitored by Mr. Daniel E. Fitch, ONR (N00014-98-1-02-04, H. B. Dietrich), and NSF DMR 0400416 (L. Hess).

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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