Patent ID: 6998298
Filing Date: 2006-02-14
Classification: H01L

Abstract:
1. A method of fabricating a thyristor memory, comprising: forming sidewalls in a layer of dielectric over a layer of semiconductor material to define a trench and expose a region of the semiconductor material through the opening of the trench; forming conductive material on at least portions of the dielectric and in the trench; patterning the conductive material to define first and second shoulders extending outwardly from the trench over regions of the dielectric outside the trench; the patterning to comprise forming the first shoulder as an overhang extending laterally outward from the trench over regions of the layer of semiconductor material for the thyristor; etching exposed regions of the layer of dielectric to form an implant mask while using the conductive material with the first and second shoulders as an etch mask; implanting regions of the layer of semiconductor material; and using the implant mask to align placement of dopant during at least a portion of the implanting; in which the implanting comprises: