Patent ID: 7579230
Filing Date: 2009-08-25
Classification: H01L

Abstract:
1. A method for manufacturing a device comprising: patterning a predetermined region of a semiconductor substrate by etching a predetermined depth into the substrate to form a plurality of reverse diffusion under field regions and a plurality of raised portions, each of the reverse diffusion under field regions exposing a surface of the substrate; masking the reverse diffusion under field regions and forming a diffusion under field region in each of the plurality of raised portions adjacent to at least one of the reverse diffusion under field region; forming spacers on sidewalls of the diffusion under field regions and exposing a portion of the surface of the substrate in the reverse diffusion under field region; forming an epitaxial layer on an entire surface of the substrate, including the spacers; and forming a well region in the epitaxial layer over each of the diffusion under field regions.