### 2.4.3 CuInSe2 and other Chalcogenides

| There are a lot of "Chalcogenides", meaning compounds with "Chalcogens", i.e. S, Se, and Te as major elements (O, in the same IIa group, forms "oxides").
|  | The general recipe is to form a IB - IIIA - VI compound. In group IB we have essentially Cu, Ag, Au; in group IIIA we find B, Al, Ga, In.
|  | That allows us, for example, to produce CuInS2 or CuInSe2 ("CIS"), but also Cu3In5Se9, Cu2In4Se7 - look up the link for many more.
|  | Like before, we can "mix", e.g. produce CuInxGa1-xSySe2-y and so on. In case of doubt we call the whole family "CIGS".
|  | It certainly looks like there is plenty of work left for you, but "CIS" or "CIGS" solar cells are actually on the market.
|  | Moreover, there are "simple" chalcogenides like CdTe, which are on the market for solar cells but not even contained in the long list in the link from above.
| We obviously have a big success story here. We will look at some of this later in more detail.

© H. Föll (Semiconductor Technology - Script)