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Abstract

A plasma dry etch process for trench etching in single slice RIE etch reactors wherein a selective sidewall passivation is accomplished to control the profile of the trench being etched. The process comprises methods of passivating the sidewall by passivation on a molecular scale and by passivation by a veneer type passivation comprising buildup of a macroscopic residue over the surface of the sidewall. Several methods are disclosed for forming and shaping the passivating layers (both mono-atomic and bulk). By carefully controlling the composition and shape of the sidewall passivating veneer in conjunction with other etch factors, the desired trench profiles can be achieved.

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First Claim