Patent ID: 8835283
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A fabrication method for producing semiconductor chips with enhanced die strength, comprising following steps: Step A1: forming an active layer on a front side of a substrate, in which said active layer comprises at least one integrated circuit; Step A2: forming a backside metal layer on a backside of said substrate, in which said backside metal layer at least fully covers the area corresponding to the area covered by said at least one integrated circuit in said active layer, so as to form at least one semiconductor wafer with enhanced die strength by comprising said substrate, said active layer and said backside metal layer; Step A3: forming a protection layer on a front side of said semiconductor wafer, in which said protection layer fully covers said at least one integrated circuit in said active layer; Step A4: dicing said semiconductor wafer with enhanced die strength from the front side of said semiconductor wafer to a backside of said semiconductor wafer by at least one laser dicing process, whereby plural semiconductor chips with enhanced die strength are produced, wherein said backside metal layer of said semiconductor chip and a substrate of said semiconductor chip are cut tidily, so that the backside metal layer of said semiconductor chip fully covers the backside of said semiconductor chip, and the composition at the border remains intact to prevent die cracking on the border between said substrate of said semiconductor chip and said backside metal layer of said semiconductor chip; and Step A5: removing the laser dicing residues and removing said protection layer by at least one etching process, wherein said laser dicing residues are generated during said at least one laser dicing process.