Jump to main content
Jump to site search


Suppressed intrinsic excitation and enhanced thermoelectric performance in AgxBi0.5Sb1.5-xTe3

Abstract

Bi2Te3-based alloys are the most well-known thermoelectric materials for room-temperature application. However, the maximum ZT values of Bi2Te3-based materials are usually achieved near room temperature. The ZT values dramatically drop above 400 K because of material’s intrinsic thermal excitation in Bi2Te3-based materials, which seriously restricts their applications as thermoelectric power generators. In this study, by doping tiny amount of Ag into Bi0.5Sb1.5Te3, we successfully suppressed the intrinsic excitation in p-type Bi2Te3-based materials and shifted the ZT peak temperature to high temperatures. Eventually, due to the enhanced power factor and greatly depressed bipolar thermal conductivity at high temperature, a maximum ZT of 1.25 at 400 K was obtained in Ag0.002Bi0.5Sb1.498Te3, and an average ZT value of approximately 1.03 was achieved between 300 and 600 K. The theoretical energy conversion efficiency of TE module fabricated with Ag0.002Bi0.5Sb1.498Te3 achieves a maximum value of 11.0% when ∆T = 300 K, which makes p-type Bi2Te3-based devices attractive for the applications in TE power generation.

Back to tab navigation

Publication details

The article was received on 08 Oct 2017, accepted on 10 Nov 2017 and first published on 11 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04573E
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
  •   Request permissions

    Suppressed intrinsic excitation and enhanced thermoelectric performance in AgxBi0.5Sb1.5-xTe3

    T. Xing, R. Liu, F. Hao, P. Qiu, D. Ren, X. Shi and L. Chen, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04573E

Search articles by author

Spotlight

Advertisements