Method for manufacturing an accelerometer sensor of crystalline material

In an accelerometer sensor of crystalline material, whose components are composed partly of monocrystalline and partly of polycrystalline material, a band-shaped seismic mass preferably is composed of polycrystalline material, whose suspension by means of suspension segments of monocrystalline material at the end regions permits a movement in the longitudinal direction upon the occurrence of an acceleration. Parallel plates extend from this mass at right angles to their longitudinal direction and, together with additional plates, which run parallel to said plates and are anchored at a base, form a capacitor arrangement and are composed, in particular, of monocrystalline material. At least the monocrystalline material is doped to attain an electric conductivity. When lightly doped, the long and thin plates and suspension segments have a high conductivity, given a very small mechanical prestressing, and can easily be isotropically undercut. The polycrystalline formation of the seismic mass can be designed to be very wide and large by etching away an underlying sacrificial oxide.