Issue 40, 2022

Influence of structure phase transition on the thermoelectric properties of Cu2Se1−xTex liquid-like compounds

Abstract

Copper chalcogenide Cu2(Se,Te) compounds are well known as typical p-type thermoelectric materials with a figure of merit (ZT) that can be optimized by the ratio of Se : Te. Here, by using the mechanical alloying and solid-state reaction methods, Te was substituted into Se sites within Cu2Se as the formula Cu2Se1−xTex (x = 0.1, 0.2, 0.25, and 0.3). The observed changes in structural phase, grain morphologies, and grain size were recorded by XRD and FE-SEM imaging with the appearance of the secondary phase of Cu2Te, with a Te content of x = 0.25. The layered structure morphology was observed more clearly at the high Te content. The electrical conductivity was greatly increased with enriched Te content while the maximum Seebeck coefficient was obtained in the Cu2Se0.75Te0.25 sample. Accordingly, a power factor value of up to 9.84 μW cm−1 K−2 at 773 K was achieved. The appearance of a Cu2Te phase with a Te content of 0.25 created a structural phase transition which results in a ZT value of 1.35 at 773 K in the Cu2Se0.75Te0.25 sample.

Graphical abstract: Influence of structure phase transition on the thermoelectric properties of Cu2Se1−xTex liquid-like compounds

Article information

Article type
Paper
Submitted
11 Jul 2022
Accepted
09 Sep 2022
First published
15 Sep 2022
This article is Open Access
Creative Commons BY license

RSC Adv., 2022,12, 26383-26389

Influence of structure phase transition on the thermoelectric properties of Cu2Se1−xTex liquid-like compounds

T. K. Mac, T. T. Ta, H. T. Nguyen, V. D. Nguyen, T. L. H. Pham, V. T. Duong, T. D. Thanh, B. T. Phan and A. T. Duong, RSC Adv., 2022, 12, 26383 DOI: 10.1039/D2RA04268A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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