Patent ID: 7906438

Claim:
A method for single wafer etching, wherein a single thin disk-like silicon wafer sliced from a silicon single crystal ingot is mounted on a wafer chuck and spun thereon, and an overall front surface of the wafer is etched with an etching solution supplied thereto by centrifugal force generated by spinning the wafer, comprising: supplying the etching solution onto the front surface of the wafer by a plurality of supply nozzles, carrying out the supply of the etching solution while independently moving each of the plurality of supply nozzles; measuring thicknesses of corresponding portions of the wafer during etching by a plurality of sensors provided on respective tips of the plurality of supply nozzles; and controlling the amount of the etching solution supplied from the supply nozzles according to the measured wafer thicknesses of the corresponding portions of the wafer, whereby the method prevents variation in the wafer thickness.