Contrasting the Material Chemistry of Cu(2)ZnSnSe(4) and Cu(2)ZnSnS((4–) (x) ())Se(x)

Earth‐abundant sustainable inorganic thin‐film solar cells, independent of precious elements, pivot on a marginal material phase space targeting specific compounds. Advanced materials characterization efforts are necessary to expose the roles of microstructure, chemistry, and interfaces. Herein, the earth‐abundant solar cell device, Cu(2)ZnSnS((4–) (x) ())Se(x), is reported, which shows a high abundance of secondary phases compared to similarly grown Cu(2)ZnSnSe(4). [Image: see text]