Method of making thin film piezoresistive sensor

摘要

Semiconductor piezoresistive sensors are formed by a process using selective laser activation of a doped semiconductor surface. The substrate is a flexible membrane such as a diaphragm or bellows. A layer of insulative dielectric material is first applied to the substrate. A layer of highly resistive doped semiconductor material is then deposited on top of the dielectric layer. Through the use of an alignment device one or more piezoresistive sensors are formed by use of laser annealing of selected areas of the semiconductor material such that the annealed areas have a resistance suitable for use as sensors. Metal contacts are then applied over the end portions of sensors and form an electrical connection to the sensors. The non-annealed portions of doped semiconductor layer act as insulators between the formed piezoresistive sensors.