Patent ID: 6489246
Filing Date: 2002-12-03
Classification: H01L

Abstract:
A method of manufacturing an image sensor, the method comprising the steps:(a) providing a substrate having a gate-insulating layer abutting a portion of the substrate; (b) depositing a silicon layer on the gate-insulating layer, (c) creating a plurality of openings in the deposited silicon layer; (d) implanting a first dopant in the substrate through at least one of the plurality of the openings; (e) growing an oxide on first surfaces of the deposited silicon which first surfaces initially form a boundary for the openings; (f) coating a first photoresist in the plurality of openings between the first surfaces of the oxidized silicon; (g) exposing and developing the first photoresist for removing the first photoresist which overlies the silicon and retaining a portion of the first photoresist in the openings and on the first surface of the oxidized silicon; (h) removing the deposited silicon by etching which does not substantially remove the first photoresist and patterning a layer of second photoresist while retaining the first photoresist; and (i) implanting a second dopant in the substrate through the patterned second photoresist to provide an implant substantially aligned to an edge of a sidewall of the grown oxide.