Microfabrication of vacuum-sealed cavities with nanocrystalline and ultrananocrystalline diamond membranes and their characteristics

Date

2011-08-01

Author

Bayram, Barış

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Vacuum-sealed cavities featuring diamond membranes are fabricated using plasma-activated direct bonding technology. A chemical mechanical polished (CMP) silicon dioxide interlayer, deposited on diamond with a high temperature oxide (HTO) process at 850 degrees C in a low pressure chemical vapor deposition (LPCVD) furnace, is employed for successful direct bonding and vacuum cavity formation. The circular cavities are defined on the thermally grown oxide of the phosphorus-doped Si wafer (4-in, < 100 >, 1.2 Omega/sq) using reactive ion etching (RIE). The same microfabrication steps are applied for low residual stress (i.e. <50 MPa) nanocrystalline (NCD) and ultrananocrystalline (UNCD) diamonds to determine and compare membrane characteristics. For both diamond types, successful microfabrication of membranes is demonstrated using the optimized process flow. Profilometer measurements of membrane deflection are compared with finite element modeling (FEM), and indicate a Young's modulus of 1000 GPa for NCD and 850 GPa for UNCD. Furthermore, FEM analysis suggests the residual stress of UNCD membrane is approximately 100 MPa tensile, whereas NCD one does not show any significant residual stress (<50 MPa). Our results show that NCD is a more promising choice than UNCD as a membrane material for electromechanical transducers.

Subject Keywords

Mechanical Engineering, Electrical and Electronic Engineering, Materials Chemistry, General Physics and Astronomy, Electronic, Optical and Magnetic Materials, General Chemistry

URI

https://hdl.handle.net/11511/39373

Journal

DIAMOND AND RELATED MATERIALS

DOI

https://doi.org/10.1016/j.diamond.2011.06.026

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

B. Bayram, “Microfabrication of vacuum-sealed cavities with nanocrystalline and ultrananocrystalline diamond membranes and their characteristics,” DIAMOND AND RELATED MATERIALS, pp. 1149–1154, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39373.