摘要:
An overlay mark may include a main overlay pattern and an auxiliary overlay pattern, wherein the main overlay pattern may have an opening exposing a substrate and the auxiliary overlay pattern may be formed in the opening. The auxiliary overlay pattern may be spaced apart from a sidewall of the main overlay pattern defining the opening. The thickness ratio of the auxiliary overlay pattern to the main overlay pattern may be about 0.05:1 to about 0.30:1. Accordingly, overlay accuracy measurements may be improved using the clearer overlay mark according to example embodiments.
摘要:
A method of manufacturing a pattern structure and a method of forming a trench using the same are provided. A mask pattern structure having mask patterns spaced apart from one another may be formed on a layer. The mask pattern structure may be divided into a first region having a first pattern density and a second region having a second pattern density higher than the first pattern density. The layer may be etched using the mask pattern structure as an etching mask to form first sidewalls positioned under the first region and second sidewalls positioned under the second region. The first sidewall may have a first profile that may be substantially vertical. The second sidewall may have a second profile of which an interval between the second sidewalls becomes narrower toward lower portions of the second sidewalls.