Patent ID: 8802544
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A method for manufacturing a chip constituted by a functional device formed on a substrate, the method comprising: a functional device forming step of forming the functional device on one main face of a sheet-like object to be processed made of silicon; a first modified region forming step of converging a laser tight at the object so as to form a first modified region parallel to the one main face of the object at a predetermined depth corresponding to the thickness of the substrate from the one main face; a second modified region forming step of converging the laser light at the object so as to form a second modified region extending such as to correspond to side edges of the substrate as seen from the one main face on the one main face side in the object such that the second modified region joins with the first modified region along the thickness direction of the object; and an etching step of selectively advancing etching along the first and second modified regions after the first and second modified region forming steps so as to cut out a part of the object and form the substrate, wherein the first modified region is a continuous planar region parallel to the main face of the object located at a predetermined depth measured along the thickness direction from the main face of the object, the second modified region is continuously formed along the thickness direction of the object so as to join with the first modified region and comprises a plurality of continuous planar regions perpendicular to the main face of the object and parallel to corresponding edges of the object and forming a rectangular frame, and the second modified region extends like grids as seen from the one main face.