In-situ elemental reaction-regulated Ag_(2)S films enable the best thermoelectric performances  

作　　者：Chengcheng Xing Ruijuan Qi Yi Chang Xiaoming Ma Yan Lei Shuangquan Zang Zhi Zheng 

机构地区：[1]Key Laboratory for Micro-Nano Materials for Energy Storage and Conversion of Henan Province,College of Chemical and Materials Engineering,Institute of Surface Micro and Nano Materials,Xuchang University,Henan,P.R.China [2]Green Catalysis Center,College of Chemistry,Zhengzhou University,Zhengzhou,P.R.China [3]School of Physics and Electronic Science,Key Laboratory of Polar Materials and Devices,Ministry of Education,Department of Electronic Science,East China Normal University,Shanghai,P.R.China [4]School of Chemistry and Chemical Engineering,Key Laboratory of Green Chemical Media and Reaction,Ministry of Education,Collaborative Innovation Center of Henan Province for Fine Chemicals Green Manufacturing,Henan Normal University,Xinxiang,P.R.China

出　　处：《Aggregate》2024年第4期360-366,共7页聚集体（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:52072327;Key research and development project of Henan Province,Grant/Award Number:231111232100;Science and Technology Innovation Talents in Universities of Henan Province,Grant/Award Number:23HASTIT002;Natural Science Foundation of Henan Province of China,Grant/Award Number:242300421205。

摘　　要：Silver sulfide thinfilm,with excellent thermoelectric properties,is few reported due to the complex and time-consuming high-temperature or high-pressure synthesis process.Here,a fast ionic conductor n-type Ag_(2)Sfilm with good crystallinity and uniform density is prepared by sputtering metal Agfilms of different thicknesses on glass and then reacting in S precursor solution at low temperature.At 450 K,β-Ag_(2)Sfilms can be obtained and underwent a phase transition fromα-Ag_(2)S monoclinic,which had a significant effect on their electrical and thermal properties.The grain size of Ag_(2)Sfilms increases with the increase offilm thickness.Before and after the phase transition,the carrier concentration and mobility cause obvious changes in the electrical properties of Ag_(2)S.The carrier concentration of body-centered cubic phaseβ-Ag_(2)S is about three orders of magnitude higher than that of monoclinic phaseα-Ag_(2)S,and the mobility is also 2–3 times that of the latter.Especially,after the phase transition,the conductivity ofβ-Ag_(2)S rises exponentially from the zero conductivity ofα-Ag_(2)S and increases with the increase of temperature.The Ag_(2)Sfilm shows the highestfigure of merit of 0.830.30 at 600 K from the sample with±∼1600 nm thickness,which is the highest record among Ag_(2)S-based thermoelectric materials reported so far.

关 键 词：finefilm in-situ elemental reaction phase transition THERMOELECTRIC β-Ag2S 

分 类 号：TB34[一般工业技术—材料科学与工程]