Patent ID: 7651947

Claim:
A method of forming a mask for implanting a substrate, the method comprising the steps of: depositing an implant stopping layer over the substrate, wherein the implant stopping layer includes at least one of: hydrogenated germanium carbide, nitrogenated germanium carbide, fluorinated germanium carbide, and amorphous germanium carbon hydride (GeHX), where X includes carbon, and wherein the substrate includes at least one trench isolation; depositing a photoresist over the implant stopping layer, the implant stopping layer having a density and a depth greater than a density and a depth of the photoresist; forming a pattern in the photoresist by removing a portion of the photoresist to expose the implant stopping layer; and transferring the pattern into the implant stopping layer by etching to form the mask, wherein the implant stopping layer pattern includes a portion of the implant stopping layer directly over and abutting the at least one trench isolation.