Direct wafer bonding of SiC-SiC by SAB for monolithic integration of SiC MEMS and electronics

Fengwen Mu, K. Iguchi, H. Nakazawa, Y. Takahashi, M. Fujino, T. Suga

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Although the monolithic integration of silicon carbide (SiC) Micro-Electro-Mechanical Systems (MEMS) and SiC electronics is very promising, it is still very challenging due to the absence of suitable bulk machining technology of SiC. In this research, wafer bondingwas proposed to assist themonolithic integration of SiCMEMSand SiC electronics by the formation of a suspended epitaxial SiC membrane. However, currently, SiC-SiC wafer bonding is still very difficult, especially for its direct wafer bonding. Surface activated bonding (SAB) method was applied to realize the direct wafer bonding of SiC-SiC at room temperature. The bonding energy of ~1.4 J/m2 was obtained without orientation dependence. Correspondingly, the tensile strength of bonding interface is ~12.2 MPa and could be improved by rapid thermal annealing to the values higher than 21.6 MPa. The bonding mechanisms were investigated through Monte Carlo simulation, interface analysis by transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX), and in-situ analysis on the activated SiC surfaces by X-ray photoelectron spectroscopy (XPS).

Original languageEnglish
Pages (from-to)P451-P456
JournalECS Journal of Solid State Science and Technology
Issue number9
Publication statusPublished - 2016 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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