A new self-sealing thin-film encapsulation process for MEMS

F. Santagata, I. Zaccaria, R. Poelma, J. Creemer, G. Zhang, P. Sarro
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Abstract

In this paper we present a new sealing technique for thin-film encapsulation of MEMS components without unwanted deposition on the device surface. The capping layer contains an array of bimorph cantilevers placed on top of the access holes acting as thermally-actuated valves that close the access holes during the sealing step. Microcavities were designed and fabricated to validate the concept. Both high and low-temperature encapsulation schemes have been implemented. Bimorph cantilevers made of LPCVD SiO and SiN are used for the high temperature micropackages whereas PECVD SiN and Aluminum are used for low temperature micropackages. The micropackages are successful encapsulated and no deposition is observed inside the micropackages.
MEMS自密封薄膜封装新工艺
在本文中,我们提出了一种新的密封技术,用于MEMS元件的薄膜封装,而不会在器件表面产生不必要的沉积。覆盖层包含放置在入口孔顶部的双晶片悬臂阵列,作为在密封步骤期间关闭入口孔的热致动阀。设计并制造了微腔来验证这一概念。采用了高温和低温两种封装方案。由LPCVD SiO和SiN制成的双晶悬臂梁用于高温微封装,而PECVD SiN和铝用于低温微封装。微包成功封装,微包内无沉积现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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