Aiming at the heterogeneous structural characteristics of silicon on insulator( SOI)
a technique of twice alignment and twice anode bonding is proposed
to achieve laminated bonding of silicon sensitive chip of wafer-level SOI high temperature pressure sensor. SOI pressure chip with three-layer structure of glass-silicon-glass has good sealing and bonding strength. After testing
bonding interface of SOI high temperature pressure sensor chip is uniform
formation without defects
leak rate is below 5 × 10
-9
Pa·m~3/s
bonding strength is over 3 MPa.And the chip is packaged without lead
it is obtained by test that the total precision of the sensor is less than0. 5 % FS in 500 ℃.