Manipulation of phase structure and Se vacancy to enhance the average thermoelectric performance of AgBiSe2

Shan Li, Shuaihang Hou, Wenhua Xue, Li Yin, Yijie Liu, Xiaodong Wang, Chen Chen, Jun Mao, Qian Zhang

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The high-temperature cubic phase of AgBiSe2 has been revealed to enable promising thermoelectric performance because of the high symmetry. In this work, it is shown that the cubic phase could be stabilized at room temperature by alloying SnSe. Although the effective mass increased, the decreased carrier concentration and mobility as well as the aggravated bipolar effect deteriorated the thermoelectric properties of the pure cubic phase. In contrast, the room-temperature rhombohedral AgBiSe2 obtained a peak zT value of ∼0.66 at 723 K, which is attributed to the decreased thermal conductivity and increased power factor. Furthermore, reducing Se content not only increased the carrier concentration, but also increased the mobility due to the reduced energy barrier, and hence substantially improved the power factor over the whole temperature range. As a result, the peak zT and average zT were further enhanced in Ag0.94Bi0.94Sn0.06Se1.92. This work provides a novel strategy to optimize the thermoelectric performance of AgBiSe2 material.

Original languageEnglish
Article number100837
JournalMaterials Today Physics
Volume27
DOIs
StatePublished - Oct 2022

Keywords

  • AgBiSe
  • Alloying
  • Phase modulation
  • Se vacancy
  • Thermoelectric

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