Enhanced Thermoelectric Performance of P-Type (Bi,Sb) Te by Incorporating Non-Stoichiometric Ag Te and Refining Te-Se Ratio.

Power generation modules utilizing thermoelectric (TE) materials are suitable for recycling widespread low-grade waste heat (<600 K), highlighting the immediate necessity for advanced Bi Te -based alloys. Herein, the substantial enhancement in TE performance of the p-type Bi Sb Te (BST) sintered sample is realized by subtly incorporating the non-stoichiometric Ag Te and counteractive Se. Specifically, Ag atoms diffused into the BST lattice improve the density-of-states effective mass (m ) and boost the hole concentration for the suppressed bipolar effect.

Optimized Thermoelectric Cooler Performance by the Structure-Matching Design of Asymmetrical p/n-Type Legs.

Commercial BiTe-based thermoelectric (TE) coolers typically comprise equal-size p- and n-type legs. However, this traditional structure limits the cooling temperature differences of TE coolers (TECs) due to identical current density, when their electrical or thermal characteristics differ significantly. This work presents a novel design of p- and n-type TE legs to optimize the performance of TECs.

High Performance Thermoelectric Power of BiSbTe Through Synergistic CuGeSe and Se Incorporations.

BiTe-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 BiSbTe (BST) is realized by incorporating CuGeSe and Se. Concretely, the diffusion of Cu and Ge atoms optimizes the hole concentration and raises the density-of-states effective mass (m ), compensating for the loss of "donor-like effect" exacerbated by ball milling.