Half-tone phase shift mask blank and method for manufacturing half-tone phase shift mask
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United States of America Patent
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Oct 13, 2015
Grant Date -
Nov 21, 2013
app pub date -
May 13, 2013
filing date -
May 16, 2012
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Abstract
A half-tone phase shift film 2 and a light-shielding film 3 are stacked on transparent substrate 1. The light-shielding film 3 has a monolayer structure or a multilayer structure. At least one layer is formed by film-formation with a chromium-containing material including tin. The half-tone phase shift film 2 is made of a molybdenum silicon nitride oxide. The layer made of a chromium-containing material including tin can cause a significant increase in the etching rate at the time of chlorine-containing dry-etching including oxygen. Thus, burden on the resist pattern or hard mask pattern at the time of transferring a pattern on the light-shielding film is reduced, and therefore it is possible to carry out pattern transfer with high precision. The present invention provides a novel technique that can increase a dry-etching rate of a light-shielding film made of a chromium-containing material while assuring various characteristics required for the light-shielding film.
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