Patent ID: 7183160

Claim:
A method for producing a flash memory comprising: forming at least two adjacent rows of precursor stacks of floating gate transistors on a semiconductor substrate, with the precursor stacks being at least partially covered by a protective resin and being separated by a formation zone for a source line, wherein the forming at least two adjacent rows of precursor stacks of floating gate transistors on a semiconductor substrate includes forming a semiconductor substrate with a drain for each precursor stack, wherein the drain is covered in a resin; and wherein for each of the precursor stacks, the drain is formed opposite the formation zone for the source line; forming a trench in the formation zone for the source line by an attack of the formation zone and of the protective resin so as to result in a deposit of residue from the protective resin below the precursor stacks, wherein the forming a trench includes forming a trench so as to result in the protective resin formed of thick i-line resin; removing the deposit of residue; and implanting a source line in the formation zone, with at least a portion of the source line extending directly below the precursor stacks.