EUV mask set and methods of manufacturing EUV masks and integrated circuits
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United States of America Patent
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Jan 13, 2015
Issued Date -
N/A
app pub date -
Oct 16, 2012
filing date -
Oct 16, 2012
priority date (Note) -
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Abstract
An EUV mask set and method of manufacturing is disclosed. In one embodiment, a set of EUV mask blanks is inspected to obtain information about defects in each of the EUV mask blanks. From the obtained information, a set of complementary functional portions is determined, wherein each functional portion is assigned to one of the EUV mask blanks and does not contain any of the defects. The functional portions of the EUV mask blanks of the EUV mask blank set complement one another to form a virtual image area corresponding in size to image areas of the EUV mask blanks. A predefined mask pattern is provided on the EUV mask blanks. Information identifying position and shape of the functional portions is used to control an illumination process for imaging the predefined mask pattern onto a target.
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