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Figure 8. (A) Ag₂Se-Ag₂S phase diagram based on the heat flow curves (schematics of the cation Se/S framework in orthorhombic, monoclinic, and cubic structures)^[170], Copyright 2023 Springer Nature (B, C) optical image and comparison of the normalized maximum power densities of the materials among Ag₂Se_1-xS_x-based inorganic, inorganic-organic hybrid flexible, and organic flexible TE devices, (D) room-temperature absolute value of Seebeck coefficient as a function of electrical conductivity for plastic/ductile bulk SnSe₂-based crystals (red spheres), and other reports for comparison, (E, F) optical images of a six-couple flexible Cu_0.005SnSe_1.95Br_0.05/Pt–Rh in-plane TE device with Cu_0.005SnSe_1.95Br_0.05 as n-type legs and Pt-Rh wire, and comparison of normalized maximum power density among the reported flexible in-plane TE devices^[160]. Copyright 2023 Wiley-VCH GmbH. TE: Flexible thermoelectric.