Patent ID: 7666702

Claim:
A method for fabricating a microstructure comprising the steps of: forming at least one insulation layer over an upper surface of a silicon substrate, the insulation layer including an inner metal micro-electro-mechanical structure, the micro-electro-mechanical structure including at least one microstructure and at least one metal sacrificial structure that are independent with each other, the metal sacrificial structure including metal layers and metal via layers connected to the respective metal layers; forming at least one barrier layer over an upper surface of the insulation layer; forming an etching stop layer over a lower surface of the silicon substrate; carrying out an etching operation from the lower surface of the silicon substrate to form a space corresponding to a predetermined suspension microstructure in the micro-electro-mechanical structure; and etching the metal sacrificial structure for forming a suspension space for the microstructure to achieve a microstructure suspension of the micro-electro-mechanical structure.