Patent ID: 9728515
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A wafer comprising: a plurality of semiconductor chips having a major surface; a plurality of metal contacts abutting the major surface, each of the metal contacts having side surfaces and a contact surface, wherein each of the contact surfaces defines a thickness of the metal contact relative to the major surface; an underfill abutting the major surface of one of the plurality of semiconductor chips and abutting the side surfaces of the metal contacts, the underfill having a top surface, wherein the top surface of the underfill defines a thickness of the underfill relative to the major surface, the thickness of the underfill being no greater than the thickness of the metal contact; a photoresist layer abutting the top surface of the underfill and forming a cavity; and a solder bump in electrical contact with the contact surface of a respective metal contact of the metal contacts, wherein the solder bump is situated, at least in part, within the cavity.