Patent ID: 9716446
Date: 2017-07-25
CPC Classifications: B81B,B81C,H01L,H02N,Y10T

Claim:
1. A method of forming a self-powered piezoelectric energy harvesting microsystem, comprising: forming integrated circuit elements including transistor gate structures and source/drain regions using CMOS processing steps at a proof mass first portion of a die region of a semiconductor wafer substrate; depositing and patterning dielectric layers and metal layers at the first portion of the die region to form contacts and interconnections for the integrated circuit elements; depositing and patterning first electrode, piezoelectric material and second electrode layers at a beam second portion of the die region to form piezoelectric energy harvesting unit components connected to the integrated circuit elements; etching fully through the substrate to form a support frame third portion of the die region separated by a gap from a majority of the first portion and joining by the second portion to a minority of the first portion; etching partially through the substrate to thin the second portion; and providing a battery connected to the integrated circuit elements at the first portion of the die region.