process for the production of highly sensitive, capacitive, and resonierenden integrated sensors, in particular accelerometers and gyroscopes, and thus manufactured sensors

摘要

To increase the sensitivity of the sensor the suspended structure (40) forming the seismic mass has a tungsten core (26) which has high density. To manufacture it, a sacrificial layer (21) of silicon oxide, a polycrystal silicon layer (24), a tungsten layer (26) and a silicon carbide layer (28) are deposited in succession over a single crystal silicon body (1); the suspended structure (40) is defined by selectively removing the silicon carbide (28), tungsten (26) and polycrystal silicon (24) layers; spacers (30') of silicon carbide are formed which cover the uncovered ends of the tungsten layer (26); and the sacrificial layer (21) is then removed. IMAGE