首页|Modulation doping of p-type Cu12Sb4S13 toward improving thermoelectric performance

Modulation doping of p-type Cu12Sb4S13 toward improving thermoelectric performance

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The commercial viability of thermoelectric(TE)devices relies heavily on two factors:cost reduction and efficiency enhancement.In this study,we first produce p-type Cu12Sb4S16-x(x=0,3,4)using a low-temperature bottom-up approach and demonstrate Cu12Sb4S13 to show the best TE performance among the three tested compositions.Subsequently,the TE energy conversion efficiency of Cu12Sb4S13 is further enhanced by optimizing its electronic band structure through the incorporation of small amounts of tel-lurium.At an optimal Te content of 5 mol％,more than a twofold increase in the TE figure of merit(zT)is obtained.To gain insight into the mechanism of improvement on the transport properties of the mate-rial,we compare the interphase transport mechanism by incorporating nanodomains of different metals(Ag and Cu)into the Cu12Sb4S13 matrix.The improved electrical conductivity obtained with Cu12Sb4S13-Te nanocomposites is attributed to a charge flooding of the Cu12Sb4S13 surface.In contrast,excessive down-ward band-bending at the interphases of Ag/Cu metal-semiconductor drastically reduces the electrical conductivity.Besides,a weighted mobility(μw)analysis shows a dominant thermal activation of carri-ers in Cu12Sb4S13-Te nanocomposites.In this material,a strong decrease in lattice thermal conductivity is also found,which is associated with a phonon-carrier scattering mechanism.Our work shows the impor-tance of proper band-engineering in TE nanocomposites to decouple electrical and thermal transport to enhance TE performance,and the efficacy of μw for electrical and thermal transport analysis.

Modulation dopingThermoelectricInterphase transportCharge floodingPhonon-carrier scattering

Khak Ho Lim、Mingquan Li、Yu Zhang、Yue Wu、Qimin Zhou、Qingyue Wang、Xuan Yang、Pingwei Liu、Wen-Jun Wang、Ka Wai Wong、Ka Ming Ng、Yu Liu、Andreu Cabot

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Institute of Zhejiang University-Quzhou,Quzhou 324000,China

College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310007,China

School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China

Materials Research Institute,The Pennsylvania State University,University Park,PA 16802,USA

Ostia Technologies Limited,United Kingdom

Department of Chemical and Biological Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,China

ICREA,Pg.Lluis Companys 23,Barcelona 08010,Spain

Catalonia Energy Research Institute-IREC,Sant Adria del Besos,Barcelona 08930,Spain

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National Natural Science Foundation of ChinaResearch Funds of the Institute of Zhejiang University-QuzhouResearch Funds of the Institute of Zhejiang University-QuzhouResearch Funds of the Institute of Zhejiang University-QuzhouResearch Funds of the Institute of Zhejiang University-QuzhouState Key Laboratory of Fluorinated Greenhouse gases Replacement and TreatmentState Key Laboratory of Electrical Insulation and Power EquipmentNational Natural Science Foundation of China(NSFC)Innovation and Entrepreneurship Project of Overseas Returnees in Anhui Province

22208293IZQ2021RCZX003IZQ2021RCZX002IZQ2021KJ2024IZQ2022KYZX09SKLFGGRT2022001EIPE23201222090342022LCX002

2024

10.1016/j.jmst.2023.07.008

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.171(4)
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