Funct. Mater. 2020; 27 (3): 575-580.
Purification of Cd1-xZnxTe crystals from Te inclusions by hot zone method
Yu. Fedkovych Chernivtsi National University, 2 Kotziubynskoho Str., 58012 Chernivtsi, Ukraine
In order to eliminate the Te inclusions in Cd0.9Zn0.1Te crystals grown with the tellurium excess, a hot zone method was used, similar to the traveling heater method, but without additionally weighted tellurium. After such heat treatment, a significant decrease of the density of secondary-phase inclusions was observed. Based on the studies of the Hall constant temperature dependence, a decrease in the concentration of shallow A1 (εA = 0.03 eV) and deeper A2 acceptors (εA = 0.15 eV) was found; as well, a decrease in the magnitude of the absorption coefficient in the visible and infrared regions of the spectrum was noticed. The concentration of ionized centers was reduced by almost an order of magnitude; this indicates a significant increase of the material purity.
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