Patent ID: 6112738
Filing Date: 2000-09-05
Classification: B28D,H01L

Abstract:
A method of slicing an ingot of semiconductor material into wafers using a wire saw, said wire saw including a wire for slicing the ingot, said wire being movable in a forward direction and a reverse direction during slicing, said method comprising the steps of:defining an identification region of each wafer to be sliced from the ingot, said identification region of each wafer being adapted for marking with a series of laser-scribed marks after slicing, said laser-scribed marks forming an identification mark; andslicing the ingot into wafers with the wire saw, said slicing step comprising:moving the wire in the forward and reverse directions during slicing except when slicing in the identification region of each wafer; andmoving the wire only in the forward direction when slicing in the identification region of each wafer whereby thickness variations in each wafer relative to the size of the identification mark are reduced in the identification region of each wafer.