Patent ID: 9087914
Filing Date: 2015-07-21
Classification: B23K,H01L

Abstract:
1. A wafer processing method for dividing a wafer into a plurality of individual devices along a plurality of crossing division lines formed on a front side of said wafer, said wafer including a substrate, a functional layer formed on the front side of said substrate, and an SiO 2 film formed on a front side of said functional layer, said individual devices being formed from said functional layer and partitioned by said division lines, said wafer processing method comprising: a functional layer removing step of applying a laser beam to said wafer along each division line to thereby remove said functional layer along each division line, said laser beam having an absorption wavelength to said SiO a wafer dividing step of processing said substrate along each division line where said functional layer has been removed by performing said functional layer removing step, thereby dividing said wafer into said individual devices.