Effect of plastic hot-rolling on thermoelectric properties in Ag2Se0.65S0.35 ductile materials

IF 10 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics Pub Date : 2025-03-18 DOI:10.1016/j.mtphys.2025.101707

Shiqi Yang , Jin Liu , Xuefeng Zhao , Pengfei Qiu , Xun Shi

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Abstract

Ag₂(S, Se) solid solutions near the morphotropic phase boundary (MPB) well integrate excellent room-temperature ductility and high thermoelectric (TE) performance together, showing the great potential for the usage in flexible thermoelectrics. However, their orthorhombic-monoclinic phase transition brings great difficulty to fabricate the Ag₂(S, Se)-based flexible films with high TE performance. In this work, taking the Ag₂Se_0.65S_0.35 which locates at the orthorhombic-monoclinic phase boundary as an example, we systematically investigate the evolutions of phase and electrical transport properties of Ag_2-xSe_0.65S_0.35 during the plastic hot-rolling and the following post-treatment processes. Significantly degraded power factor is observed with increasing the deformation degree, but it can be recovered back by post-treatment, i.e. firstly annealing at 353 K and then dipping in liquid nitrogen. Finally, high-performance flexible Ag₂Se_0.65S_0.35 film with a room-temperature power factor of 17.0 μWcm⁻¹K⁻² is successfully obtained, providing a promising candidate materials for the development of flexible TE device used in wearables.

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塑性热轧对Ag2Se0.65S0.35韧性材料热电性能的影响

Ag2（S, Se）固溶体在偏向形态相边界（MPB）附近很好地结合了优异的室温延展性和高热电性能，在柔性热电材料中显示出巨大的应用潜力。然而，它们的正交-单斜相变给制备具有高TE性能的Ag2（S, Se）基柔性薄膜带来了很大的困难。本文以位于正交-单斜相边界的Ag2-xSe0.65S0.35为例，系统研究了Ag2-xSe0.65S0.35在塑性热轧及后处理过程中的相和电输运性质的演变。随着变形程度的增加，功率因数明显下降，但经过后处理，即先在353 K下退火，然后浸在液氮中，功率因数可以恢复。最后，成功制备了室温功率因数为17.0 μWcm-1K-2的高性能柔性薄膜Ag2Se0.65S0.35，为可穿戴柔性TE器件的开发提供了一种有前景的候选材料。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.