Patent ID: 9460967
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a semiconductor chip, comprising: forming on a semiconductor substrate a plurality of etching masks each including a protection film to demarcate a plurality of first regions of the semiconductor substrate protected by the plurality of etching masks and a second region as an exposed region of the semiconductor substrate; and anisotropically removing the second region by a chemical etching process to form a plurality of grooves each including a side wall at least partially located in the same plane as an end face of the etching mask and a bottom portion reaching a back surface of the semiconductor substrate, thereby singulating the semiconductor substrate into a plurality of chip main bodies corresponding to the plurality of first regions, wherein the chemical etching process includes providing a precious metal catalyst on the second region, and then putting the semiconductor substrate in contact with an etching liquid or an etching gas, wherein the precious metal catalyst is granular, and wherein the chemical etching process is performed such that each of the plurality of chip main bodies includes, on an end face thereof, stripe-shaped recesses or projections each extending from a surface of the chip main body, on which the protection film is formed, toward an opposite surface thereof.