Figure 4

The band structures of the (a) BiOCl/BiOCl, (b) BiOBr/BiOBr, and (c) BiOI/BiOI structures. The corresponding partial density of states (DOS) of the (d) BiOCl/BiOCl, (e) BiOBr/BiOBr, and (f) BiOI/BiOI structures. The violet, red, green, brown, and blue lines represent the partial DOS of Bi, O, Cl, Br, and I atoms, respectively.