Patent ID: 11456363

Abstract:
An indium phosphide crystal substrate has a diameter of 100-205 mm and a thickness of 300-800 μm and includes any of a flat portion and a notch portion. In any of a first flat region and a first notch region, when an atomic concentration of sulfur is from 2.0×1018 to 8.0×1018 cm−3, the indium phosphide crystal substrate has an average dislocation density of 10-500 cm−2, and when am atomic concentration of tin is from 1.0×1018 to 4.0×1018 cm−3 or an atomic concentration of iron is from 5.0×1015 to 1.0×1017 cm−3, the indium phosphide crystal substrate has an average dislocation density of 500-5000 cm−2.