Method of creating an alignment mark on a substrate and substrate
In an embodiment, a method of creating an alignment mark on a substrate includes forming a plurality of lines segmented into electrically conducting line segments and space segments, thereby forming spaces between the lines to form a macroscopic structure in a first layer of the substrate, creating a plurality of electrically conducting trenches in a second layer of the substrate, and arranging the plurality of trenches to be in electrical contact with the line segments and overlapping the space segments at least partially.
1. A method of creating an alignment mark on a substrate, comprising:
forming a plurality of sets of lines, the lines in each set being segmented into electrically conducting line segments and space segments, thereby forming spaces between the sets of lines to form a macroscopic structure in a first layer of the substrate, wherein the sets of lines are separated by spaces that are larger than the space segments; and
creating one set of electrically conducting trenches in a second layer of the substrate, wherein the trenches are in electrical contact with the line segments and are arranged to at least partially overlap the space segments.
2. A method according to claim 1 , farther comprising segmenting the lines in each set in two directions.
3. A method according to claim 1 , wherein the electrically conducting line segments or trenches comprise at least one of aluminum, silver and tungsten.
4. A method according to claim 1 , further comprising determining a position of the alignment mark based on macroscopic properties of the alignment mark including the position of the macroscopic structure.
5. A method according to claim 1 , wherein a dimension of each of the space segments is substantially identical, in that they are periodic.
6. A method according to claim 1 , wherein the trenches are spaced substantially uniformly, in that they are periodic.
7. A method according to claim 1 , wherein each of the trenches comprises an electrically conductive material.