LIU Zhi-hui, TIAN Lei, LI Yu-ling, et al. Research on BCB bonding process of acceleration sensitive chip made of three-layer Si wafer[J]. 2015, 34(3): 37-39+43.
LIU Zhi-hui, TIAN Lei, LI Yu-ling, et al. Research on BCB bonding process of acceleration sensitive chip made of three-layer Si wafer[J]. 2015, 34(3): 37-39+43. DOI: 10.13873/j.1000-9787(2015)03-0037-03.
Fabrication of three-layer Si structure MEMS piezoresistive acceleration sensitive chips by BCB bonding is carried out. Bonding with Benzo-cyclo-butene( BCB) is suitable for MEMS wafer level packaging because of its low process temperature and low requirement for surface. But viscosity of BCB reduce and liquidity increase while the temperature rise
BCB flows along the micro-gaps due to the capillary-effect
which leads to conglutination of movable structure and failure of the device. By controlling thickness of BCB
and adding overcome groove resolve problem of conglutination of movable structure three-layer Si structure acceleration chips is fabricated. Cell samples is tested
bonding shear strength is more than 20MPa and hemeticity is less than 1. 0 ×10- 10Pa·m3/s
which meets requirement for fields such as aviation