1. Stabilizing Distorted Ductile Semiconductors for Excellent Ductility and Thermoelectric Performance.
- Author
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Wang, Yumeng, Chen, Qiyong, Qiu, Pengfei, Gao, Zhiqiang, Yang, Shiqi, Xi, Lili, Yang, Jiong, and Shi, Xun
- Subjects
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CARRIER density , *GOLD alloys , *DOPING agents (Chemistry) , *CHEMICAL bonds , *ALLOYS , *THERMOELECTRIC materials - Abstract
Element doping/alloying is a common strategy to tune the electrical and thermal transports of thermoelectric (TE) materials, but the doping/alloying limit of foreign elements in many TE materials is usually very low, bringing a great challenge to improve the TE performance. In this work, beyond the classic principle of “like dissolves like,” it is found that choosing the compound with a severely distorted lattice and diversified chemical bonding as the matrix also facilitates achieving a high doping/alloying limit. Taking ductile semiconductors as an example, this work shows that gold (Au) element is nearly immiscible in Ag2S and Ag2Te, but has a relatively high alloying limit in complex Ag2S0.5Te0.5 meta‐phase. Au in Ag2S0.5Te0.5 significantly decreases the carrier concentration and improves the TE performance, but scarcely changes the mechanical properties. Consequently, Ag1.99Au0.01S0.5Te0.5 demonstrates both a high figure‐or‐merit of 0.95 at 550 K and extraordinary room‐temperature ductility. This work offers an effective and general strategy to develop stabilized doped/alloyed TE materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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