Patent ID: 9640486
Date: 2017-05-02
CPC Classifications: H01L

Claim:
1. Method of manufacturing silicon wafers comprising the steps of: texturing, doping and diffusion treating a wafer to produce characteristic semiconductor properties, reading an individual identification pattern comprising a number of lines on the peripheral edge of the wafer to identify the ingot or column the wafer was cut from, and reading a marking having a position line on the peripheral edge of the wafer which is inclined with respect to a longitudinal line of an ingot or column the wafer was cut from to identify the position of the wafer within the ingot or column, wherein the individual identification pattern of lines comprises a plurality of parallel lines which are distanced from each other, the lines being of different depth and wherein the individual identification pattern is provided by an individual sequence of depths of the plurality of lines, wherein the ingot or column comprises a first axial section and a second axial section extending axially along the ingot or column, wherein the first axial section comprises a first identification pattern at an upper region of the ingot or column and a first inclined position line at a lower region of the ingot or column, and wherein the second axial section comprises a second identification pattern at the lower region and a second inclined position line at the upper region.