Patent ID: 8496842
Filing Date: 2013-07-30
Classification: H01L

Abstract:
1. A method of fabricating a MEMS device integrated on a same substrate as an integrated circuit, the method comprising: forming integrated circuit components proximate a top surface of a semiconductor substrate; forming a dielectric isolation layer over a substrate in an area defined for a flexible element; forming a lower hydrogen barrier layer over the dielectric isolation layer; forming a ferroelectric layer over the lower hydrogen barrier layer; patterning the ferroelectric layer to form a piezoelectric element; forming first and second electrodes on the piezoelectric element; forming an upper hydrogen barrier over the piezoelectric element; forming metal contacts to make electrical connections to the first and second electrodes; and etching a back of the substrate to remove material from the substrate in a flexible element area and in a back side singulation trench area, thereby defining a flexible element, a proof mass and a base.