Patent ID: 11901170
Assignee: JX METALS CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC H  B  C | IPC B  C  H

Claim 7:
8. A method for producing the indium phosphide substrate according to claim 1, comprising the steps of:
cutting a wafer from an indium phosphide ingot with a wire saw;
etching the cut wafer;
chamfering an outer peripheral portion of the wafer after the etching;
polishing at least one surface of the chamfered wafer; and
etching the polished wafer,
wherein the step of cutting the wafer from the indium phosphide ingot with the wire saw comprises a step of constantly delivering a new wire while reciprocating the wire in a horizontal direction, and moving a stage on which the indium phosphide ingot is placed in a vertical direction toward the wire, wherein a new wire delivering rate of the wire is from 10 to 60 m/min, a reciprocating rate of the wire is from 300 to 350 m/min, a vertical moving rate of the stage on which the indium phosphide ingot is placed is from 200 to 400 μm/min, and abrasive grains of the wire saw have a viscosity of from 300 to 400 mPa·s,
wherein the step of etching the cut wafer comprises etching the cut wafer by a total of 5 to 15 μm from both sides, and
wherein the step of etching the polished wafer comprises etching the polished wafer by a total of 8 to 15 μm from both sides.