Thermoelectric Transport Performance in p-Type AgSbTe₂-Based Materials through Entropy Engineering

Basit, Abdul1; Hussain, Tanveer2; Li, Xin3; Xin, Jiwu4; Zhang, Bin5,6; Zhou, Xiaoyuan5,6; Wang, Guoyu5,6; Dai, Ji-Yan1

2024-06-10

10.1021/acsami.4c06836

ACS APPLIED MATERIALS & INTERFACES   影响因子和分区

1944-8244

1944-8252

Being a major obstacle, Ag2Te has always been restricted in p-type AgSbTe2-based materials to improve their thermoelectric performance. This work reveals a stabilized AgSbTe2 through Sn/Ge alloying as synthesized by melting, annealing, and hot press. Interestingly, addition of Sn/Ge in AgSbTe2 extended the solubility limit up to similar to 30% and hence suppressed Ag2Te in Ag(1-x)SnxSb(1-y)GeyTe2 compounds and led to enhanced electrical transport. Moreover, electrical and thermal transport properties of AgSbTe2 have been greatly affected by the phase transition of Ag2Te near 425 K. However, high-entropy Ag0.85Sn0.15Sb0.85Ge0.15Te2 compound results in a stabilized rock-salt structure and presents a high power factor of similar to 10.8 mu W cm(-1) K-2 at 757 K. Besides, density functional theory reveals that available multivalence bands in Sn/Ge-doped AgSbTe2 lead to reduction in energy offsets. Meanwhile, a variety of defects appear in the Ag0.85Sn0.15Sb0.85Ge0.15Te2 sample due to entropy change, and thus lattice thermal conductivity decreases. Ultimately, a high figure of merit of similar to 1.5 is attained at 757 K. This work demonstrates a roadmap for other group IV-VI materials so that the high-entropy approach may inhibit the impurity phases with extended solubility limit and result in high thermoelectric performance.

AgSbTe2 thermoelectric carrierconcentration solubility microstructure

SCI ; EI

英语

其他

Hong Kong Polytechnic University[2019B121205001] ; Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices (GDSTC)[1-W23Z]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001243947500001

AMER CHEMICAL SOC

Web of Science

1.Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong 999077, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
4.Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
5.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 401331, Peoples R China
6.Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China

Basit, Abdul,Hussain, Tanveer,Li, Xin,et al. Thermoelectric Transport Performance in p-Type AgSbTe₂-Based Materials through Entropy Engineering[J]. ACS APPLIED MATERIALS & INTERFACES,2024,16(24).

Basit, Abdul.,Hussain, Tanveer.,Li, Xin.,Xin, Jiwu.,Zhang, Bin.,...&Dai, Ji-Yan.(2024).Thermoelectric Transport Performance in p-Type AgSbTe₂-Based Materials through Entropy Engineering.ACS APPLIED MATERIALS & INTERFACES,16(24).

Basit, Abdul,et al."Thermoelectric Transport Performance in p-Type AgSbTe₂-Based Materials through Entropy Engineering".ACS APPLIED MATERIALS & INTERFACES 16.24(2024).