Abstract
The transport and growth rates in the ZnTe–I2 system by the closed-tube method are experimentally investigated as a function of the charged iodine concentration in the range ∼2×10-3 mg/cm3 to ∼2×10 -1 mg/cm3. The thermodynamic calculations are described here in detail so as to clarify the transport mechanism in this system. The two reactions, i.e. the dissociative sublimation and the complicated disproportionations corresponding to low and high iodine concentrations respectively, play an important role in the transport process of ZnTe. The experimentally-determined transport rate can be described quantitatively over the whole range of iodine concentration by using the two different values, ∼0.038 cm2/s and ∼0.015 cm2/s, as the mean diffusion constant in the low and high regions of iodine concentration respectively.
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