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Bi2Te3‐based alloys are the benchmark for commercial thermoelectric (TE) materials, the widespread demand for low‐grade waste heat recovery and solid‐state refrigeration makes it imperative to enhance the figure‐of‐merits. In this study, high‐performance Bi0.5Sb1.5Te3 (BST) is realized by incorporating Cu2GeSe3 and Se. Concretely, the diffusion of Cu and Ge atoms optimizes the hole concentration and...
The emerged strategy of entropy engineering provides new ideas for realizing high‐performance thermoelectric materials, but it is still much unresolved how to achieve delicate trade‐off between the carrier mobility mH and the lattice thermal conductivity κph in taking advantage of configurational entropy ΔS. Herein, the significant advances of ultralow κph yet decent mH in a new medium‐entropy system...