Patent ID: 9023727
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A method of providing a semiconductor structure, the method comprising the steps of: providing a substrate with at least a bonding pad on the substrate; forming a patterned mask layer on the substrate, wherein the patterned mask layer includes an opening which exposes at least a part of the bonding pad; depositing a conductive layer in the opening, wherein a height difference exists between a top surface of the conductive layer and a top surface of the adjacent mask layer, and the top surface of the conductive layer is lower than the top surface of the adjacent mask layer; and wherein a ratio of the height difference and a thickness of the mask layer is controlled to be in a range of from ¼ to ½; forming a cap layer on the conductive layer, wherein the cap layer is a solder layer, wherein forming the cap layer comprises a reflowing step; and removing the patterned mask layer; wherein the cap layer forming step allows a contacting area between the cap layer and the conductive layer to be substantially equal to the top surface area of the conductive layer; wherein forming the cap layer comprises a disposing step which is random spraying, and the reflowing step is subsequent to the disposing step; wherein the random spraying comprises positioning a plurality of solder balls on the conductive layer.