Patent ID: 8865566
Filing Date: 2014-10-21
Classification: B23K,B28D,H01L

Abstract:
1. A method of cutting a semiconductor substrate, the method comprising the steps of: irradiating a semiconductor substrate with laser light having a wavelength that enables the laser light to transmit through a laser incident surface of the semiconductor substrate, thereby forming a modified region only within the semiconductor substrate along each of a plurality of cutting lines arranged in a matrix with respect to at least one of a front and a rear surface of the semiconductor substrate, wherein each modified region is a molten processed region separated from the laser incident surface in a thickness direction of the semiconductor substrate, and each modified region forms a cutting area of the semiconductor substrate to be cut; and expanding a sheet, after the cutting areas of the semiconductor substrate are formed by the irradiation step, by pulling peripheral portions of the sheet outwardly, thereby cutting and separating at least the semiconductor substrate along the cutting lines where the cutting areas have been formed, the sheet being bonded to the semiconductor substrate.