Hierarchical Structuring to Break the Amorphous Limit of Lattice Thermal Conductivity in High-Performance SnTe-Based Thermoelectrics

Wang, Lijun and Hong, Min and Sun, Qiang and Wang, Yuan and Yue, Luo and Zheng, Shuqi and Zou, Jin and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2020) Hierarchical Structuring to Break the Amorphous Limit of Lattice Thermal Conductivity in High-Performance SnTe-Based Thermoelectrics. ACS Applied Materials & Interfaces, 12 (32). pp. 36370-36379. ISSN 1944-8252


Abstract

Minimizing lattice thermal conductivity, κl, of thermoelectric materials is an effective strategy to enhance their figure-of-merit, zT. However, the amorphous limit of κl affects the ceiling of the attainable zT. Herein, we fabricate hierarchical structures by using an in situ microwave synthesis to break the amorphous limit of κl for achieving a high zT in (Sn0.985In0.015Te)1–x(AgCl)x alloys. Our results from detailed electron microscopy characterizations suggest that the as-sintered (Sn0.985In0.015Te)1–x(AgCl)x alloys contain a range of lattice imperfections, including microsized grains with dense grain boundaries, nanopores with sizes from several to hundreds of nanometers, and nanoscale precipitates, which result in strong phonon scatterings and in turn lead to a minimized κl of 0.245 W m–1 K–1. Moreover, the calculated band structures reveal the introduction of resonance level by In doping, which dramatically enhances the electrical transport properties to ensure a high power factor of 26.4 μW cm–1 K–2 at 823 K and a maximum zT of 0.86 (823 K) in hierarchically structured (Sn0.985In0.015Te)0.90(AgCl)0.10. This work provides a new approach to modulate the hierarchical structures for optimizing thermal and electronic transport properties.


Statistics for USQ ePrint 40557
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 26 Jan 2021 22:21
Last Modified: 29 Jan 2021 04:38
Uncontrolled Keywords: SnTe; microwave solvothermal method; resonance level; hierarchical structure; thermoelectric
Fields of Research (2008): 02 Physical Sciences > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
51 PHYSICAL SCIENCES > 5104 Condensed matter physics > 510404 Electronic and magnetic properties of condensed matter; superconductivity
Funding Details:
Identification Number or DOI: https://doi.org/10.1021/acsami.0c09781
URI: http://eprints.usq.edu.au/id/eprint/40557

Actions (login required)

View Item Archive Repository Staff Only