Evaluation of Gas Permeability for Micro-scale Thin Polymer Film with Encapsulated MEMS Damped Oscillator

被引:0
|
作者
Gando, Ryunosuke [1 ]
Nakamura, Naofumi [1 ]
Hayashi, Yumi [1 ]
Ono, Daiki [1 ]
Masunishi, Kei [2 ]
Tomizawa, Yasushi [2 ]
Yamazaki, Hiroaki [1 ]
Ikehashi, Tamio [1 ]
Sugizaki, Yoshiaki [1 ]
Shibata, Hideki [1 ]
机构
[1] Toshiba Co Ltd, Semicond & Storage Prod Co, Ctr Semicond Res & Dev, Saiwai Ku, 1 Komukai Toshiba Cho, Kawasaki, Kanagawa 2128583, Japan
[2] Toshiba Co Ltd, Ctr Res & Dev, Saiwai Ku, Kawasaki, Kanagawa 2128583, Japan
来源
2014 IEEE SENSORS | 2014年
关键词
polymer film; gas permeability; MEMS; damping oscillation; Quality factotr; PERMEATION;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present a practical method to evaluate gas permeability for thin polymer films using an encapsulated micro-electro-mechanical-system (MEMS) oscillator. Previously, we have developed a hermetic thin-film dome structure for RF-MEMS tunable capacitor, using conventional back-end-of-the-line (BEOL) processes. The dome is made of multiple layers including a polymer film, whose gas permeability is an important factor with respect to productivity and reliability. So far, it had been difficult to evaluate the gas permeability for such small and thin polymer films with sub-millimeter diameter and micron-scale thickness. In this evaluation method, the pressure dependence of air-damping oscillation is used to measure the permeability. As a demonstration, we carried out a permeability measurement of a 0.5-mm-diameter dome sealed with a thin (1 mu m) polymer film. The resulting permeability coefficient is found to be 1X10(-16) mol/m/Pa/s, at room temperature.
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页数:4
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