Patent ID: 6617751
Filing Date: 2003-09-09
Classification: H03H,Y10T

Abstract:
A method for fabricating a film bulk acoustic resonator (FBAR) device having air gap, comprising steps of:forming a sacrificial layer on a substrate; forming a photoresist pattern on a portion of an upper surface of the sacrificial layer; forming a sacrificial pattern by etching the sacrificaial layer by using the photoresist pattern as an etching mask; depositing an insulating material on the substrate; forming a membrane supporting layer on sides of the sacrificial pattern by eliminating the insulating material and the photoresist pattern on the sacrificial pattern so that the sacrificial pattern and the insulating material have the same height; forming a membrane layer on the sacrificial pattern and the membrane supporting layer; forming a first electrode on the membrane layer; forming a piezoelectric layer on the first electrode; forming a second electrode on the piezoelectric layer; and removing the sacrificial pattern to form the air gap.