Overlay mark

An overlay mark includes a first feature extending in an X-direction, wherein the first feature is a first distance from a substrate. The overlay mark further includes a second feature extending in a Y-direction perpendicular to the X-direction, wherein the second feature is a second distance from t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Shieh, Ming-Feng, Chang, Ching-Yu, Chen, Chen-Yu
Format: Patent
Sprache:eng
Schlagworte:
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Beschreibung
Zusammenfassung:An overlay mark includes a first feature extending in an X-direction, wherein the first feature is a first distance from a substrate. The overlay mark further includes a second feature extending in a Y-direction perpendicular to the X-direction, wherein the second feature is a second distance from the substrate, and the second distance is different from the first distance. The overlay mark further includes a third feature extending in the X-direction and the Y-direction, wherein the third feature is a third distance from the substrate, and the third distance is different from the first distance and the second distance.