Issue 3, 2020

Atomic-scale tuning of oxygen-doped Bi2Te2.7Se0.3 to simultaneously enhance the Seebeck coefficient and electrical conductivity

Abstract

Manipulation of oxygen-related impurities is an extreme challenge for most of the thermoelectric materials, especially for those possessing nanostructures, since they normally result in the degradation of the thermoelectric performance. Here, we demonstrate that by atomic-scale controlling of oxygen doping in the form of dislocation clusters in Bi2Te2.7Se0.3 (BTS) thermoelectric materials, the trade-off between the Seebeck coefficient and electrical conductivity is broken, resulting in the simultaneously enhanced Seebeck coefficient and electrical conductivity and the suppressed thermal conductivity. As a consequence, a maximum ZT of 0.91 is achieved, which is approximately 1.4 times higher than that of pristine BTS. Based on HR-STEM investigation, the oxygen-related dislocation clusters can be unambiguously identified and we argue that the optimized carrier/phonon transport behavior can be attributed to the multifunctionality of oxygen-related dislocation clusters in BTS acting as electron donors, electron energy filters and phonon blockers. Our work provides a clear microscopic understanding on the role of oxygen doping in modifying phonon/carrier transport behavior in BTS thermoelectric materials, which provides an efficient avenue for designing high performance thermoelectric materials.

Graphical abstract: Atomic-scale tuning of oxygen-doped Bi2Te2.7Se0.3 to simultaneously enhance the Seebeck coefficient and electrical conductivity

Supplementary files

Article information

Article type
Paper
Submitted
03 set 2019
Accepted
26 nov 2019
First published
26 nov 2019

Nanoscale, 2020,12, 1580-1588

Atomic-scale tuning of oxygen-doped Bi2Te2.7Se0.3 to simultaneously enhance the Seebeck coefficient and electrical conductivity

S. Li, M. Chu, W. Zhu, R. Wang, Q. Wang, F. Liu, M. Gu, Y. Xiao and F. Pan, Nanoscale, 2020, 12, 1580 DOI: 10.1039/C9NR07591G

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