Process for removal of residues remaining after etching polysilicon layer in formation of integrated circuit structure

摘要

The invention comprises an improvement in the process wherein a polysilicon layer, which is formed over a step on an integrated circuit structure and masked with a photoresist, is anisotropically etched to remove the exposed portions of the polysilicon layer leaving sidewall residues of a polymerized silicon/oxide-containing material adjacent the polysilicon lines. The improvement comprises treating the integrated circuit substrate with an aqueous hydroxide/peroxide solution to remove the residues of polymerized silicon/oxide-containing material, without undercutting the remaining polysilicon.