Patent ID: 8759209

Claim:
A method of making a semiconductor device, comprising: providing a substrate including a contact pad; forming a first insulation layer over the substrate and contact pad; forming a first under bump metallization (UBM) over the first insulation layer and electrically connected to the contact pad; forming a second insulation layer over the first UBM; forming a second UBM over the second insulation layer after the second insulation layer is cured, the second UBM electrically connected to the first UBM such that the second insulation layer is between and separates portions of the first and second UBMs; forming a photoresist layer over the second UBM and removing a portion of the photoresist layer to form an opening in the photoresist layer over the contact pad; depositing a conductive bump material within the opening in the photoresist layer; removing the photoresist layer; removing a peripheral portion of the second UBM such that the conductive bump material overhangs the second UBM; removing a peripheral portion of the first UBM such that the second insulation layer overhangs the first UBM; and reflowing the conductive bump material to form a spherical bump.