Self-aligned 0-level sealing of MEMS devices by a two layer thin film reflow process

C.R. Rusu, Henricus V. Jansen, R. Gunn, A. Witvrouw

    Research output: Contribution to conferencePaperAcademicpeer-review

    8 Citations (Scopus)
    176 Downloads (Pure)


    Many micro electromechanical systems (MEMS) require a vacuum or controlled atmosphere encapsulation in order to ensure either a good performance or an acceptable lifetime of operation. Two approaches for wafer-scale zero-level packaging exist. The most popular approach is based on wafer bonding. Alternatively, encapsulation can be done by the fabrication and sealing of perforated surface micromachined membranes. In this paper, a sealing method is proposed for zero-level packaging using a thin film reflow technique. This sealing method can be done at arbitrary ambient and pressure. Also, it is self-aligned and it can be used for sealing openings directly above the MEMS device. It thus allows for a smaller die area for the sealing ring reducing in this way the device dimensions and costs. The sealing method has been demonstrated with reflowed aluminium, germanium, and boron phosphorous silica glass. This allows for conducting as well as non-conducting sealing layers and for a variety of allowable thermal budgets. The proposed technique is therefore very versatile.
    Original languageUndefined
    Number of pages6
    Publication statusPublished - 5 May 2003
    Event2003 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS, DTIP 2003 - Mandelieu-La Napoule, France
    Duration: 5 May 20037 May 2003


    Conference2003 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS, DTIP 2003
    Abbreviated titleDTIP
    CityMandelieu-La Napoule


    • EWI-14569
    • IR-65201

    Cite this