Patent ID: 6759699
Filing Date: 2004-07-06
Classification: G11C,H01L

Abstract:
A method to form digital follower devices each comprising an n-channel vertical FET and a p-channel vertical FET device, said method comprising:forming n-channel vertical FET devices and p-channel vertical FET devices wherein said vertical FET devices are formed by a method comprising: forming STI regions in a semiconductor substrate; forming bulk regions of a first doping type in said semiconductor substrate; implanting ions into said bulk regions on a first side of said STI regions to thereby form drain regions wherein said drain regions comprise said first doping type and wherein said drain regions overlie said bulk regions; implanting ions into said bulk regions on a second side of said STI regions to form gate regions wherein said gate regions comprise said first doping type and wherein voltages on said gate regions control vertical channels in said bulk regions; and implanting ions into said bulk regions on said second side of said STI regions to form buried regions between said gate regions and said bulk regions wherein said buried regions comprise a second doping type; and forming connective lines to connect together said n-channel FET device drain regions and said p-channel FET device drain regions and to connect together said n-channel FET device gate regions and said p-channel FET device gate regions.