Patent ID: 9176018
Filing Date: 2015-11-03
Classification: B81B,G01L,H01L

Abstract:
1. A method of fabricating a piezoresistor pressure sensor, comprising: providing a first silicon-on-insulator structure comprising a first silicon layer deposited on a first oxide layer over a first bulk silicon layer; providing a second silicon-on-insulator structure comprising a second silicon layer deposited on a second oxide layer over a second bulk silicon layer; bonding the first silicon layer and the second silicon layer together with the first silicon layer and the second silicon layer facing each other; removing the second bulk silicon layer; removing the second oxide layer, thereby leaving the second silicon layer of the second silicon-on-insulator structure overlying the first silicon layer; forming one or more openings of predetermined shape and dimension to expose a portion of the second silicon layer; forming one or more piezoresistors on the one or more openings of the second silicon layer; forming a patterned trench within the second silicon layer and the first silicon layer, stopping at the first oxide layer; removing the first bulk silicon layer, thereby forming the piezoresistor pressure sensor within the patterned trench.