Patent ID: 7871880

Claim:
A method, comprising: forming on a semiconductor substrate a superficial first semiconductor layer of a first type of conductivity; forming trench regions in said superficial first semiconductor layer; forming semiconductor portions of a second type of conductivity contained in said first semiconductor layer by filling in said trench regions with a second semiconductor layer of the second type of conductivity; forming, on said first semiconductor layer, dielectric screening structures positioned on opposite sides of one of said semiconductor portions; forming an implanted body region of the second type of conductivity by carrying out at least one ion implantation of a first type of dopant in said one of said semiconductor portions while the dielectric screening structures are in place on the first semiconductor layer; forming dielectric spacer on sidewalls of the dielectric screening structures and above respective portions of the implanted body region; forming an implanted source region of said first type of conductivity inside said implanted body region by carrying out at least one ion implantation of a second type of dopant in said implanted body region using the dielectric spacers as a mask; and carrying out an activation thermal process of said first and second types of dopants of said implanted body and source regions.