Patent ID: 9748119
Date: 2017-08-29
CPC Classifications: B23K,H01L

Claim:
1. A wafer processing method in which a wafer in which devices are formed in a plurality of regions marked out by a plurality of streets formed in a lattice manner on a surface of a substrate composed of a phosphorus compound and metal electrodes are formed over the surface is subjected to laser processing along the streets, the wafer processing method comprising: a step of holding the wafer by a chuck table; a protective film forming step of forming a water-soluble protective film on a surface of the wafer; a laser beam irradiating step of irradiating the wafer with a laser beam along the streets after the protective film forming step; a step of supplying a chemical having an amino group to the wafer; and a removing step of cleaning and removing a compound that is generated on the wafer by the supplying of the chemical, wherein the generated compound contains phosphorus.