Patent ID: 7465601
Filing Date: 2008-12-16
Classification: B81C

Abstract:
1. A method of forming a suspended structure, comprising the steps of: providing a substrate; forming a first patterned photoresist on a front surface of the substrate; performing a thermal process to solidify the first patterned photoresist; forming a second patterned photoresist on the substrate and the first patterned photoresist, the second patterned photoresist having an opening to expose a part of the first patterned photoresist and a part of the substrate; forming a structural layer covering the first patterned photoresist, the second patterned photoresist, and the substrate; performing a lift-off process to remove the second patterned photoresist and a part of the structural layer; performing a thinning process on a back surface of the substrate; performing a first etching process on the back surface of the substrate and forming a through hole positioned below the first patterned photoresist; and performing a second etching process to remove the first patterned photoresist and form a suspended structure.