(color online) (a) Schematic diagrams of the lattice framework in multicomponent materials compared with an ordinary binary compound. (b) Schematic diagram of the entropy engineering with multicomponent TE materials. (c) Maximum confgurational entropy (in units of k_B per formula unit) as a function of material solubility parameter δ for given multicomponent TE materials, where n is the number of components. (d) Plots of maximum zT versus confgurational entropy in Cu₂(S/Se/Te)-, (Cu/Ag)(In/Ga)Te₂-, and Cu₈Ge(Se/Te)₆-based multicomponent TE materials.^[26] Reproduced from Ref. [26] with permission from WILEY-VCH.