Ultrahigh thermoelectric figure of merit in n-type TiS2 thin films via hybrid superlattice with nanocrystal-amorphous composites

Le résumé fourni par la source

• Hybrid superlattice integrates nanocrystal–amorphous TiS 2 to boost ZT to 2.95 at 235 °C. • Resonance hybridization in composite layers induces DOS distortion for high Seebeck coefficient. • Superlattice and phase-composite synergy suppresses κ L below amorphous limit. Achieving high thermoelectric efficiency requires optimizing both the power factor and thermal conductivity. In this study, we introduce a novel approach to significantly enhance the thermoelectric performance of TiS 2 by incorporating nanocrystal-amorphous composite nanolayers within an organic–inorganic hybrid superlattice. While the suppression of lattice thermal conductivity through enhanced phonon scattering in the superlattice structure is well established, this work uniquely demonstrates a substantial improvement in the Seebeck coefficient, driven by the nanocrystal-amorphous composite. This architecture not only doubles the power factor but also effectively reduces lattice thermal conductivity, resulting in a synergistic effect that achieves a record-breaking figure of merit (ZT) of 2.95 at 235 °C. These results surpass previous TiS 2 -based thermoelectric benchmarks and highlight the potential of this innovative approach to advance the development of highly efficient thermoelectric materials for energy conversion applications.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.