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Article Dans Une Revue Angewandte Chemie International Edition Année : 2022

Engineering Transport Properties in Interconnected Enargite-Stannite type Cu2+xMn1-xGeS4 Nanocomposites

Bin Zhang
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Résumé

Understanding the mechanism that connects heat and electron transport with crystal structures and defect chemistryis fundamentalto develop materials with thermoelectricproperties.In this work, we synthesized a series of self-doped compounds Cu2+xMn1-xGeS4through Cu forMn substitution. Using a combination of powderX-ray diffraction, high resolution transmission electron microscopy and precession-assisted electron diffraction tomography, we evidence that the materialsarecomposed of interconnected enargite-and stannite-type structures, via the formation of nanodomainswith a high density of coherent interfaces. By combining experiments with ab-initio electron and phononcalculations, we discuss the structure–thermoelectric properties relationships and clarify the interesting crystal chemistry in this system. We demonstrate that excess Cu+substituted for Mn2+dope holes into the top of the valence band, leading to a remarkable enhancement of the power factor and figure of merit ZT.

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hal-03798667 , version 1 (14-10-2022)

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Ventrapati Pavan Kumar, Sara Passuti, Bin Zhang, Susumu Fujii, Keita Yoshizawa, et al.. Engineering Transport Properties in Interconnected Enargite-Stannite type Cu2+xMn1-xGeS4 Nanocomposites. Angewandte Chemie International Edition, 2022, 61 (49), ⟨10.1002/anie.202210600⟩. ⟨hal-03798667⟩
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