Abstract
One of the key problems of CdCl 2:O 2 annealing of CdTe absorber layers in the low temperature region between 350 and 450 °C is the activation mechanism of CdTe transport, i.e. by activation of surface diffusion and/or by a liquid melted solution. However, indirect experimental results indicated the presence of liquid phase formation. The activation mechanism of mass transport by oxy-chloride heat treatment has been treated as a surface diffusion process. In this work we present differential thermal analysis studies of prefused compositions of CdTe–CdCl 2 with CdTeO 3 recognised as a main oxidation product of CdTe. Behaviour of the CdTe–CdTeO 3–CdCl 2 phases under vacuum annealing has been tested.
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