Process for producing sublithographic structures

Details Process for producing sublithographic structures Process for producing sublithographic structures

2006-02-23

2009-10-20

Chen, Kin-Chan (Department: 1792)

Semiconductor device manufacturing: process

Chemical etching

Vapor phase etching

C438S723000, C438S725000

Reexamination Certificate

active

07605090

ABSTRACT:
A layer structure and process for providing sublithographic structures are provided. A first auxiliary layer is formed over a surface of a carrier layer. A lithographically patterned second auxiliary layer structure is formed on a surface of the first auxiliary layer. The first auxiliary layer is anisotropically etched using the patterned second auxiliary layer structure as mask to form an anisotropically patterned first auxiliary layer structure. The anisotropically patterned first auxiliary layer structure is isotropically etched back using the patterned second auxiliary layer structure to remove subsections below the second auxiliary layer structure and to form an isotropically patterned first auxiliary layer structure. A mask layer is formed over the carrier layer including the subsections beneath the second auxiliary layer structure and is anisotropically etched down to the carrier layer to form the sublithographic structures. The first and second auxiliary layer structures are removed to uncover the sublithographic structures.

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