journal article·2018-04-01Open access

Enhanced thermoelectric performance through grain boundary engineering in quaternary chalcogenide Cu2ZnSnSe4

Yingcai Zhu, Yong Liu, Xing Tan, Guangkun Ren, Meijuan Yu, Tiandou Hu, Augusto Marcelli, Wei Xu

AIP Advances· Volume 8· Issue 4

Abstract

Quaternary chalcogenide Cu2ZnSnSe4 (CZTSe) is a promising wide band-gap p-type thermoelectric material. The structure and thermoelectric properties of lead substituted Cu2ZnSn1-xPbxSe4 are investigated. Lead primarily exists in the framework of PbSe as demonstrated by x-ray diffraction and calculation of x-ray absorption near-edge structure spectroscopy. The second phase distributes at the boundaries of CZTSe with thickness in several hundreds of nanometer. With appropriate grain boundary engineering, the enhancement of power factor and a decrease of thermal conductivity can be achieved simultaneously. As a result, a maximum figure of merit zT of 0.45 is obtained for the sample with x=0.02 at 723K.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences 1 , Beijing 100049, China

University of Chinese Academy of Sciences 2 , Beijing 100049, China

AVIC Beijing Institute of Aeronautical Materials 3 , Beijing 100095, China

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University 4 , Beijing 100084, P.R. China

INFN - Laboratori Nazionali di Frascati 5 , Via E. Fermi 40, Frascati 00044, Italy

RICMASS, Rome International Center for Materials Science Superstripes 6 , Via dei Sabelli 119A, 00185 Rome, Italy

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