Supercompliant Lattice Boosts n‐type AgSbTe2 Thermoelectrics
Source abstract
Abstract
Abstract AgSbTe2‐based compounds, the most promising near‐room‐temperature thermoelectric material, so far fail to deliver n‐type performance neither theoretically nor experimentally. Its intrinsic electron‐killer defects with very low formation energy prevent conventional n‐type doping. Herein, the first n‐type AgSbTe2 by building a supercompliant lattice, which is extremely soft with an n‐type doping efficiency far beyond the Hume–Rothery rule settled phase boundary, is reported. The overdosed supercompliant lattice gives Young's modulus lower than the 2D van der Waals crystals, globally softening the phonons. This results in a minimal sound velocity of 1950 m·s−1, which lies far below all AgSbTe2‐based compounds previously reported. The substantially softened phonons lead to a low κ of 0.27 W·m−1·K−1 that approaches the theoretical minimum. Accordingly, the n‐type Ag0.8Na0.3Sb0.6Bi0.4Te2 demonstrates a ZT value of ≈0.45 at the near‐room‐temperature range, which is the highest n‐type performance ever reported. This work unlocks the door for AgSbTe2 as an exceptional n‐type thermoelectric material.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Solidification Processing Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
Institute of Physics (IA) RWTH Aachen University 52056 Aachen Germany
Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China
China Spallation Neutron Source Science Center Dongguan 523803 China
Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China
Laboratory of High‐Pressure Physics and Material Science (HPPMS) School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China
School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China
School of Physics & Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology (HUST) Luoyu Road 1037 Wuhan 430074 P. R. China
Funding
China Postdoctoral Science Foundation · State Key Laboratory of Solidification Processing · National Natural Science Foundation of China · Key Technologies Research and Development Program
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