Bump structures having an extension

摘要

A bump structure may include a body portion spaced apart from a pad disposed on a substrate and a first extension extending from a side of the body portion onto the pad. A second extension extends from another side of the body portion.

主权项

1. A bump structure comprising:
a body portion provided on a substrate and spaced apart from a pad disposed on the substrate; a first extension extending in a first direction from the body portion toward the pad; and a second extension extending in a second direction from the body portion, the second direction opposite to or crossing the first direction, wherein a width of the first extension is smaller than a width of the body portion, wherein the bump structure includes a barrier layer, a metal layer, and a solder layer sequentially stacked on the substrate; and wherein a portion of the solder layer in the body portion is thicker than another portion of the solder layer in the first extension, wherein the first extension covers at least a portion of an upper surface of the pad, and wherein a thickness of the solder layer gradually increases from an end portion of the first extension provided on the pad toward the body portion.