Patent ID: 6635185
Filing Date: 2003-10-21
Classification: H01L,Y02C,Y02P

Abstract:
A method of etching comprising subjecting a material under plasma etching conditions to an etching composition comprising at least the following constituents:an etchant compound in an amount no less than 50% by volume of said etching composition and having a formula selected from the group consisting of Fâ€”COâ€”[(CR1R2)mâ€”CO]nâ€”F and Fâ€”COâ€”R3â€”COâ€”F, wherein m=0, 1, 2, 3, 4, or 5; n=1; R1 & R2 represent H, F or CxHyFz; wherein: x=1 or 2; and y+z=2x+1; R3 represents C(R4)&boxH;C(R5), C(R6R7)&boxH;C or Câ‰¡C; wherein: R4-7 represent H, F, or CxHyFz; wherein: x=1 or 2; and y+z=2x+1; and another constituent in addition to said etchant compound for aiding etching and/or imparting selectivity, said another constituent being substantially free of perfluorinated compounds having a GWP of greater than 5000 and sulfur-containing compounds with perfluorinated side chains having a GWP of greater than 1500.