Blue CdTe surface obtained by CdCl2 thermal treatment and their performance on CdTe solar cell

CdTe semiconductor thin film as absorbent material needs to be recrystallized, in order to improve the electrical and crystalline properties of this material. CdCl₂thermal treatment was used to reduce the defects between CdS and CdTe thin films that helps to obtain the physical properties require. On the other hand, CdCl₂ treatment leads a special blue color in the CdTe surface. The electrical properties of CdTe are influenced for this coloration and confirm a close correlation between the quality of interfaces and its photovoltaic efficiency on CdTe solar cells. A systematic characterization was made to understand the blue color origin. This study revealed TeO_Xon the CdTe surface.