Patent ID: 11899376
Assignee: APPLIED MATERIALS, INC.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 16:
17. A non-transitory, computer readable medium having instructions stored thereon that, when executed, cause a method for forming alignment marks to be performed, the method comprising:
forming a first alignment mark on a first substrate, wherein the first alignment mark has a first width within 5% of a first critical dimension (CD) of copper pads on the first substrate;
forming a first dummy pattern of first dummy copper pads on the first substrate around the first alignment mark, wherein the first dummy pattern has a first dummy pattern density within 5% of a first copper pad density of the first substrate and the first dummy copper pads have a first dummy copper pad CD within 5% of the first CD of copper pads on the first substrate;
forming a second alignment mark on a second substrate, wherein the second alignment mark has a second width within 5% of a second critical dimension (CD) of copper pads on the second substrate; and
forming a second dummy pattern of second dummy copper pads on the second substrate around the second alignment mark, wherein the second dummy pattern has a second dummy pattern density within 5% of a second copper pad density of the second substrate and the second dummy copper pads have a second dummy copper pad CD within 5% of the second CD of copper pads on the second substrate,
wherein the second alignment mark nests within the first alignment mark from a top-down viewpoint without any boundary overlay when the second substrate overlays or underlays the first substrate resulting in a predetermined alignment of the first substrate and the second substrate.