Revealing the promising near-room-temperature thermoelectric performance in Ag_(2)Se single crystals
作者机构：College of MaterialsShanghai Dianji UniversityShanghai201306China School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai200093China College of Electrical and Electronic EngineeringWenzhou UniversityWenzhou325035China
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2023年第9卷第4期
页 面：754-761页
核心收录：
学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：National Natural Science Foundation of China(Grant No.52001231,52272006,U22A2073) the Shanghai Shuguang Program,the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions,the Chenguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission,Natural Science Foundation of Zhejiang Province(LY22A040001) S&T Innovation 2025 Major Special Program of Ningbo(2020Z054) Wenzhou Municipal Natural Science Foundation(G20210016)
主 题：Thermoelectrics Single crystals High electronic quality factor Low lattice thermal conductivity Near-room-temperature
摘 要：With high carrier mobility and intrinsic low lattice thermal conductivity,Ag_(2)Se compounds have attracted increasing attention for thermoelectric application near room *** to its phase transition at~406 K and resulting thermal volume expansion,the growth and thermoelectric properties of large-sized Ag_(2)Se single crystals have seldom been reported so *** this work,the vertical Bridgeman method was used for growing bulk Ag_(2)Se single crystal,with an orientation preference along lowsymmetric(201)*** Hall mobility as high as 2000 cm^(2)/(V·s)and weak electron-phonon coupling contributes to a high electronic quality BE of~7.0 in near-room-temperature b-Ag_(2)Se single crystals,which is superior to the high-temperature phase a-Ag_(2)*** observed low lattice thermal conductivity of 0.8 W/(m·K)at 300 K is due to the low group speeds and strong anharmonicity.A promising peak zT of 0.66 at 375 K and an average zT of 0.65 at 300-375 K were realized in b-Ag_(2)Se *** low Vickers hardness and good ductile properties were confirmed by experiment and theoretical *** work not only synthesized large-sized and highly-orientated Ag_(2)Se crystals,but also revealed its great potential of thermoelectric performance and mechanical properties for various applications near room temperature.
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