Patent ID: 7569906
Filing Date: 2009-08-04
Classification: H01L,H04R

Abstract:
1. A condenser microphone including a fixed electrode, a vibrating electrode and an air gap, a first semiconductor chip formed with the fixed electrode being bonded to a second semiconductor chip formed with the vibrating electrode with the air gap interposed between the first semiconductor chip and the second semiconductor chip, the first semiconductor chip comprising the fixed electrode formed on a first semiconductor substrate, a first interlayer dielectric covering the fixed electrode and the first semiconductor substrate, and a plurality of first metal spacers formed on the first interlayer dielectric, the second semiconductor chip comprising the vibrating electrode formed on a second semiconductor substrate, a second interlayer dielectric covering the vibrating electrode and the second semiconductor substrate, and a plurality of second metal spacers formed on the second interlayer dielectric, the first semiconductor chip and the second semiconductor chip being metallically bonded to each other using the first and second metal spacers, and the air gap being formed in a region of the condenser microphone located between the first interlayer dielectric and the second interlayer dielectric except bonded regions of the first and second metal spacers.