Patent ID: 6074952
Filing Date: 2000-06-13
Classification: H01L

Abstract:
A method for forming a plurality of contact holes in a semiconductor wafer using a single etching step, said semiconductor wafer comprising a dielectric layer overlying a silicon substrate, a silicon nitride layer, and a silicon oxynitride layer, said silicon oxynitride layer overlying a first conductive layer and said silicon nitride layer overlying a second conductive layer, said method comprising:developing a photoresist layer on said dielectric layer defining said plurality of contact holes; andetching through a portion of said dielectric layer and through said silicon oxynitride layer, and etching through a portion of said dielectric layer and through said silicon nitride layer using a recipe to expose said silicon substrate, said first conductive layer, and said second conductive layer, said recipe consisting a first chemistry and a second chemistry, said first chemistry chosen from the group consisting of C.sub.2 F.sub.6, C.sub.4 F.sub.8, CH.sub.3 F, and Ar, said second chemistry being chosen from the group consisting of O.sub.2, CO.sub.2, CO, and any combination thereof, said etching forming said plurality of contact holes above said silicon substrate, said first conductive layer, and said second conductive layer.