Invention Grant
US09029810B2 Using wafer geometry to improve scanner correction effectiveness for overlay control 有权
使用晶圆几何来提高扫描仪校正功能,实现覆盖控制

Using wafer geometry to improve scanner correction effectiveness for overlay control
Abstract:
Systems and methods for providing improved scanner corrections are disclosed. Scanner corrections provided in accordance with the present disclosure may be referred to as wafer geometry aware scanner corrections. More specifically, wafer geometry and/or wafer shape signature information are utilized to improve scanner corrections. By removing the wafer geometry as one of the error sources that may affect the overlay accuracy, better scanner corrections can be obtained because one less contributing factor needs to be modeled.
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