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Entropy Engineered Cubic n‐Type AgBiSe 2 Alloy with High Thermoelectric Performance in Fully Extended Operating Temperature Range
Author(s) -
Zhu Huaxing,
Zhao Ting,
Zhang Bin,
An Zibing,
Mao Shengcheng,
Wang Guoyu,
Han Xiaodong,
Lu Xu,
Zhang Jiangwei,
Zhou Xiaoyuan
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003304
Subject(s) - materials science , thermoelectric effect , cubic crystal system , atmospheric temperature range , alloy , phase diagram , hexagonal crystal system , figure of merit , thermodynamics , thermal conductivity , condensed matter physics , phase (matter) , crystallography , metallurgy , optoelectronics , composite material , physics , chemistry , quantum mechanics
Developing high performance n‐type thermoelectric (TE) materials is fundamentally important for developing high efficiency TE devices. AgBiSe 2 , which reveals superior n‐type TE performance in a cubic phase, crystallizes in a hexagonal phase at room temperature, and typically, undergoes phase transitions to a cubic phase at a temperature above 580 K. Here, for the first time, through entropy optimization with lead‐selenides (≥9.9 mol%), the high‐temperature cubic phase of AgBiSe 2 is stabilized from 300 to 800 K. Furthermore, the AgBiSe 2 ‐PbSe pseudo‐binary diagram is established. The resultant alloys with optimized entropy possess unique local distorted cubic lattices, which contribute low lattice thermal conductivity approaching 0.3 W m −1 K −1 in extended operating temperature range. Consequently, a peak figure of merit zT value of ≈0.8 at 800 K and a record‐high average zT value of 0.42 for n‐type I‐V‐VI 2 compounds are attained in pure phase cubic n‐type (AgBiSe 2 ) 1− x (PbSe) x solid solutions. These results pave the way for developing new TE materials via entropy engineering.