Realizing high thermoelectric performance in n-type highly distorted Sb-doped SnSe nicroplates via tuning high electron concentration and inducing intensive crystal defects

Shi, Xiao-Lei and Zheng, Kun and Liu, Wei-Di and Wang, Yuan and Yang, Yu-Zhe and Chen, Zhi-Gang and Zou, Jin (2018) Realizing high thermoelectric performance in n-type highly distorted Sb-doped SnSe nicroplates via tuning high electron concentration and inducing intensive crystal defects. Advanced Energy Materials, 8 (21 - Article 1800775). ISSN 1614-6832

Abstract

In this study, a record high figure of merit (ZT) of ≈1.1 at 773 K is reported in n‐type highly distorted Sb‐doped SnSe microplates via a facile solvothermal method. The pellets sintered from the Sb‐doped SnSe microplates show a high power factor of ≈2.4 µW cm−1 K−2 and an ultralow thermal conductivity of ≈0.17 W m−1 K−1 at 773 K, leading a record high ZT. Such a high power factor is attributed to a high electron concentration of 3.94 × 1019 cm−3 via Sb‐enabled electron doping, and the ultralow thermal conductivity derives from the enhanced phonon scattering at intensive crystal defects, including severe lattice distortions, dislocations, and lattice bent, observed by detailed structural characterizations. This study fills in the gaps of fundamental doping mechanisms of Sb in SnSe system, and provides a new perspective to achieve high thermoelectric performance in n‐type polycrystalline SnSe.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 08 Feb 2019 02:01
Last Modified: 11 Feb 2019 04:37
Uncontrolled Keywords: n-type doping, solvothermal synthesis, thermal conductivity, thermoelectric materials, tin selenide
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1002/aenm.201800775
URI: http://eprints.usq.edu.au/id/eprint/35497

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