Patent ID: 8048776

Claim:
A method of making a semiconductor device, comprising: providing a semiconductor wafer having an active surface; forming an under bump metallization layer over the active surface of the semiconductor wafer; forming a first photosensitive layer over the active surface of the semiconductor wafer and the under bump metallization layer; exposing a selected portion of the first photosensitive layer to light; removing a portion of a backside of the semiconductor wafer opposite the active surface after exposing the selected portion of the first photosensitive layer, wherein a surface of the photosensitive layer opposite the active surface is substantially planar across a width of the wafer during the removing of the portion of the backside of the semiconductor wafer; removing the selected portion of the first photosensitive layer after removing the portion of the backside of the semiconductor wafer; depositing a conductive material over the under bump metallization layer to form a plurality of conductive bumps; and removing a remaining portion of the first photosensitive layer after forming the conductive bumps.