Patent ID: 6913955

Claim:
A method of manufacturing a semiconductor device having a thyristor body with at least one region in a substrate, the method comprising: providing a trench in the substrate laterally adjacent to the at least one thyristor body region and having sidewalls; forming a dielectric on one of the sidewalls in the trench facing the thyristor body region; forming a thyristor control port in a lower portion of the trench and thereby providing a partially-filled trench with an effectively reduced height-to-width aspect ratio of the provided trench; filling an upper portion of the trench over the control port and covering the control port; doping the thyristor body region in the substrate and forming first and second vertically-adjacent base regions of opposite polarity, the second base region being over the first base region, wherein the thyristor control sort is configured and arranged to capacitively couple to the first base region via the dielectric and to control current in the thyristor body; implanting a region of the device below the trench and forming a first emitter region, the first emitter region being immediately adjacent to the first base region; and forming a second emitter region electrically coupled to the second base region.