**3.1 Material choosing and structure of our solar cell**

### *3.1.1 Reason for choosing ZnS*

Zinc Sulfide (ZnS) is a semiconductor formed by the association of an element atom from column II with another element atom from column VI of the periodic table of chemical elements. It has intrinsic properties which make it a material of choice in the search for good performance in the CIGSe-based thin film chain. It is recognized as having the following properties: It is non-toxic to the environment and its constituents are abundant in nature (Zinc and Sulfur) (**Table 1**).
