Patent ID: 8853092
Filing Date: 2014-10-07
Classification: H01L

Abstract:
1. A method of fabricating a plurality of features, the method comprising: forming a dielectric layer over a silicon layer; etching the dielectric layer and the silicon layer to form a plurality of first apertures in the dielectric layer and the silicon layer, wherein adjacent apertures of the plurality of first apertures are set apart by a first pitch; etching a plurality of second apertures in the dielectric layer, each aperture of the plurality of second apertures having a greater width than and centered about a respective aperture of the plurality of first apertures; implanting a plurality of dopants into the silicon layer aligned through the plurality of second apertures in the dielectric layer, wherein doped portions of the silicon layer are set apart by a second pitch less than the first pitch; etching a plurality of third apertures in the dielectric layer, each aperture of the plurality of third apertures having a greater width than and centered about a respective aperture of the plurality of second apertures; providing a patterning film over the silicon layer through the plurality of third apertures in the dielectric layer; removing the dielectric layer to expose a portion of the silicon layer through the patterning film; implanting the exposed silicon layer through the patterning film; and removing undoped portions of the silicon layer.