Patent ID: 11967659
Assignee: JX METALS CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 4:
5. A method for producing a compound semiconductor monocrystalline substrate, the substrate comprising a cadmium zinc telluride monocrystal having a zinc concentration of 4.0 at % or more and 6.5 at % or less and a chlorine concentration of 0.1 ppm by mass or more and 5.0 ppm by mass or less, the substrate having a resistivity of 1.0×107 Ωcm or more and 1.0×108 Ωcm or less when a voltage of 900 V is applied,
wherein the method comprises:
a crystal growth step of a monocrystal in a furnace; and
after the crystal growth step of the monocrystal is completed, a step of subjecting the monocrystal to a heat treatment for 50 to 90 hours under conditions where a temperature of a monocrystal placing position in the furnace is 385 to 400° C. and a temperature of a Cd reservoir portion is room temperature without opening an ampule in the furnace, and slicing a heated monocrystal ingot into a wafer to form a substrate.