Micron Technology Incorporated

Niroomand Ardavan

Richard D Holscher

An alignment mark mask element protects an underlying alignment mark during subsequent processing of the fabrication substrate. The alignment mark mask element is formed concurrent with formation of a photomask from a dual-tone photoresist that exhibits a pattern reversal upon exposure to an energy level. A portion of the dual-tone photoresist above the alignment mark is exposed to an energy sufficient to reverse a positive tone resist to a negative tone, which remains above the alignment mark after developing. The remainder of the dual-tone photoresist is exposed through a reticle at a lesser energy level and patterned to define aperture locations of a photomask for formation of semiconductor device features. In addition, a photomask for use on a fabrication substrate and an intermediate semiconductor device are disclosed. Methods of forming a photomask and an intermediate semiconductor device structure are also disclosed.

Use of a dual-tone resist to form photomasks including alignment mark protection, intermediate semiconductor device structures and bulk semiconductor device substrates

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Boise, ID, United States of America

Niroomand Ardavan