Multistage extreme ultra-violet mask qualification
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United States of America Patent
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Jul 28, 2015
Grant Date -
Sep 11, 2014
app pub date -
Mar 11, 2013
filing date -
Mar 11, 2013
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Abstract
A technique for inspecting, qualifying and repairing photo-masks for use at extreme ultra-violet (EUV) wavelengths is described. In this technique, multiple images of a substrate and/or a blank that includes multiple layers deposited on the substrate are measured and compared to identify first potential defects. Using information associated with the first potential defects, such as locations of the first potential defects, another image of the EUV photo-mask that includes a mask pattern defined in an absorption layer, which is deposited on top of the multiple layers, is measured. Based on the other image and the first potential defects, second potential defects in the EUV photo-mask are identified. Next, a qualification condition of the EUV photo-mask is determined based on the first potential defects and the second potential defects.
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