Patent ID: 7807514
Filing Date: 2010-10-05
Classification: H01L

Abstract:
1. A method of forming a stepped channel potential in a charge-coupled device comprising: (a) forming a well or a substrate of a first conductivity type; (b) forming a buried channel of a second conductivity type; (c) forming a plurality of first gate electrodes; (d) partially coating the plurality of first gate electrodes with a mask substantially aligned to an edge of each first gate electrode; (e) producing the stepped channel potential in the buried channel by implanting ions of the first conductivity type with sufficient energy to simultaneously penetrate into the buried channel between the plurality of first gate electrodes and penetrate through the uncoated portions of the plurality of first gate electrodes and into the buried channel; and (f) forming a plurality of second gate electrodes covering regions of the buried channel between the plurality of first gate electrodes.