Method for isolating active zones in a semiconductor substrate by means of shallow, non-wide trenches

摘要

The semiconductor comprises substrate (1) with a central region (6) which is intended later to become an active region. The substrate is covered by two layers (7) containing an insulating material. This consists of two layers (8, 9) of oxide materials. The insulating material forms a boss (16) which projects above the plane of the major surface of the device, projecting less than 1000 Angstroms.