Issue 37, 2020

Revealing the origin of dislocations in Pb1−xSb2x/3Se (0 < x ≤ 0.07)

Abstract

Defect engineering is an effective route to improve the performance of thermoelectric materials, including Sb doped PbSe, but the formation mechanism of defects remains unclear. In the thermoelectric material Pb1−xSb2x/3Se (0 < x ≤ 0.07), a large number of dislocations have been reported, and they enhance intermediate-frequency phonon scattering, thereby improving the zT value. However, the microstructural origin of dislocations remains unclear. In this paper, via a combination of atomic resolution scanning transmission electron microscopy and density functional theory, we successfully revealed the microstructure of Pb1−xSb2x/3Se (x = 0–0.07) for in-depth understanding of the formation mechanism of dislocations. Plenty of zinc blende (ZB) nanostructures are found in the PbSe matrix with a rock salt (RS) structure, and the theoretical calculations confirm its viability from the point of view of formation energy. A similar ZB structure is identified in the dislocation cores of Sb-doped materials as well, and thus the formation mechanism of dislocations is discussed for this PbSe system. This result provides important guidance to understand the structural evolution in compounds with a RS structure, especially in high-performance lead chalcogenide thermoelectric materials.

Graphical abstract: Revealing the origin of dislocations in Pb1−xSb2x/3Se (0 < x ≤ 0.07)

Supplementary files

Article information

Article type
Paper
Submitted
19 júl 2020
Accepted
24 aug 2020
First published
25 aug 2020

Nanoscale, 2020,12, 19165-19169

Revealing the origin of dislocations in Pb1−xSb2x/3Se (0 < x ≤ 0.07)

P. Nan, Y. Chang, Z. Chen, Y. Pei, Y. Zhang, Y. Wang and B. Ge, Nanoscale, 2020, 12, 19165 DOI: 10.1039/D0NR05382A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements