Patent ID: 8685269
Filing Date: 2014-04-01
Classification: B23K,H01L

Abstract:
1. A laser processing method of converging laser light into an object to be processed made of silicon so as to form a modified region and etching the object along the modified region so as to form the object with a through hole, the method comprising: a laser light converging step of converging the laser light at the object so as to form the modified region along a part corresponding to the through hole in the object; an etch resist film producing step of producing an etch resist film resistant to etching on an outer surface of the object after the laser light converging step; and an etching step of etching the object so as to advance the etching selectively along the modified region and form the through hole after the etch resist film producing step; wherein the laser light converging step exposes the modified region to the outer surface of the object, forming the modified region including a surface exposed to the outer surface; wherein the etch resist film producing step performs the production of the etch resist film with respect to the outer surface and the surface of the modified region; and wherein the etching step infiltrates an etchant from defects of the etch resist film formed on the surface of the modified region into the modified region, etches the modified region, forming the through hole.