Patent ID: 8438710

Claim:
A method for manufacturing a structure with an integrated circuit (IC) and a silicon condenser microphone mounted on a same substrate comprising steps of: a) providing the substrate having a first area for fabricating the IC and a second area for fabricating the silicon condenser microphone under a condition that both the IC and the silicon condenser microphone are fabricated on a first surface of the substrate; b) fabricating the IC on the first area via standard semiconductor batch processing techniques in order to form a conducting layer and an insulation layer covering the conducting layer, both the conducting layer and the insulation layer further extending to the second area; c) removing the insulation layer located at the second area in order to expose the conducting layer; d) fabricating a first film layer on the conducting layer which is located at the second area via low-temperature techniques under 400 degrees, the first film layer together with the conducting layer located at the second area forming a combination acting as one electrode of a variable capacitance; e) fabricating a sacrificial layer on the first film layer via low-temperature techniques; f) fabricating a back plate on the sacrificial layer via low-temperature techniques, the conductive back plate electrically connecting the combination and acting as the other electrode of the variable capacitance; g) defining a plurality of ventilation holes through the back plate via lithography and etching processes; h) irrigating an etching solution into the sacrificial layer through the ventilation holes in order to partly etch the sacrificial layer and form a plurality of air gaps between the first film layer and the back plate; and i) defining a back chamber through a second surface of the substrate opposite to the first surface via lithography and etching processes under a condition that the back chamber is corresponding to the second area.