Patent ID: 9595577
Date: 2017-03-14
CPC Classifications: B24B,H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: etching circumferential cavities and a cavity forming a grid, the cavity forming the grid being wider and deeper than the circumferential cavities from a front surface of a semiconductor substrate into the semiconductor substrate; providing an etch stop layer in the cavities, the etch stop layer leaving voids in the circumferential cavity and forming an etch stop structure at the bottom of the cavity forming a grid, wherein the etch stop structure is from at least one etch stop material having a high etch selectivity against the semiconductor substrate; closing at least partially, the cavity forming a grid; grinding the semiconductor substrate from a back surface opposite to the front surface at least up to an edge of the etch stop structure oriented to the back surface; and singularizing a semiconductor die from the semiconductor substrate along a parting line cutting through the etch stop structure.