• • Power factor of 2.14 mW m−1 K−2 at 300 K: This value is the highest reported for Ag2Se films prepared by thermal evaporation, directly enabling higher output power density in wearable thermoelectric generators without additional material cost.
• • ZT of 0.73 at 363 K: The optimal figure of merit approaches unity at near-body temperature, making the material competitive with conventional Bi2Te3-based flexible films while avoiding scarce Te.
• • (201) texture enhances carrier mobility: First-principles calculations confirm that the preferred orientation reduces effective mass anisotropy, boosting electrical conductivity without compromising the Seebeck coefficient, a key for decoupling thermoelectric parameters.
• • Nanopores and heterointerfaces reduce thermal conductivity: The presence of Se nano-inclusions and Ag2Se/Se/Ag interfaces scatters phonons across multiple wavelengths, lowering lattice thermal conductivity and contributing to the enhanced ZT.