Patent ID: 7211142

Claim:
A method for producing a CdTe single crystal, wherein the CdTe single crystal has a chlorine concentration between 0.1 and 1.0 ppmwt in the crystal and has a resistivity at room temperature of not less than 1.0×10 9 Ω·cm, and the CdTe single crystal is obtained according to any one of a vertical gradient freezing method, a horizontal gradient freezing method, a vertical Bridgman method, a horizontal Bridgman method, and a liquid encapsulated Czochralski method, by using as a raw material a CdTe polycrystal which is produced by doping 50 to 200 ppmwt of chlorine in a CdTe polycrystal which shows an n-type electric property of carrier concentration being not more than 1.0×10 15 cm −3 or a p-type electric property of carrier concentration being not more than 1.0×10 14 cm −3 in a state without doping the chlorine.