Patent ID: 7955982

Claim:
A method for smoothing a surface of at least one side of a wafer obtained by slicing a semiconductor ingot, comprising: measuring irregularities on the wafer surface of the wafer and storing data of the measured irregularities; measuring in advance an etching amount in a unit time with predetermined flow volume of an etching liquid discharged from a nozzle and keeping the etching amount data; and applying a fluid from a nozzle to an upwardly-facing surface of the wafer while rotating the wafer around a center axis of the wafer, wherein the application of the liquid over the wafer surface is controlled by controlling at least one of a rotation state of the wafer, a composition of the fluid, a viscosity of the fluid, a radial position of an injector nozzle relative to the wafer, an angle of the injector nozzle relative to the wafer, a height of the injector nozzle relative to the wafer, an injection state of the fluid, a movement state of the injection position, and an injection time of the fluid, based on the data of the measured irregularities and the etching amount data, in said applying a fluid.