Patent ID: 9681244
Date: 2017-06-13
CPC Classifications: B81B,B81C,H04R

Claim:
1. A method for manufacturing a microphone chip, comprising the steps of: Step I: Providing a first underlay including a first surface and a second surface opposite to the first surface, and then depositing insulating oxide layers on the first surface and second surface respectively; S2: Depositing a component layer on the insulating oxide layers of the first surface and second surface respectively; S3: Depositing a tetraethyl orthosilicate oxide layer on the surfaces of the component layers on the first surface and the second surface respectively; S4: Etching the tetraethyl orthosilicate oxide layer on the first surface of the first underlay for exposing the component layer, while removing the entire tetraethyl orthosilicate oxide layer on the second surface; S5: Patterning the insulating oxide layer, component layer and tetraethyl orthosilicate oxide layer on the first surface with the photoetching technology; S6: Providing a second underlay including a substrate with a third surface and the fourth surface corresponding opposite to the third surface, and a oxide layer and monocrystalline silicon layer deposited on the third surface; S7: Depositing oxide layers on the monocrystalline silicon layers of the described fourth surface and third surface respectively; S8: Etching the oxide layer on the monocrystalline silicon layer and then patterning this oxide layer with the photoetching technology for forming a plurality of anti-stick protrusions; S9: Etching acoustic holes in the monocrystalline silicon layer for releasing the back plate; S10: Combining the first underlay and the second underlay by contacting the tetraethyl orthosilicate oxide layer on the first surface of the first underlay to the oxide layer on the surface of the monocrystalline silicon layer of the second underlay; combining the tetraethyl orthosilicate oxide layer and the oxide layer on the surface of the monocrystalline silicon layer by welding under ambient temperature; S11: Etching the oxide layers on the substrate of the second underlay and the fourth surface for forming a back cavity; S12: Etching to the component layer from the second surface of the first underlay, for releasing the diaphragm and obtain the microphone chip.