Thermoelectric Performance of Surface-Engineered Cu1.5–xTe–Cu2Se Nanocomposites
Source abstract
Abstract
Cu 2– x S and Cu 2– x Se have recently been reported as promising thermoelectric (TE) materials for medium-temperature applications. In contrast, Cu 2– x Te, another member of the copper chalcogenide family, typically exhibits low Seebeck coefficients that limit its potential to achieve a superior thermoelectric figure of merit, zT, particularly in the low-temperature range where this material could be effective. To address this, we investigated the TE performance of Cu 1.5– x Te–Cu 2 Se nanocomposites by consolidating surface-engineered Cu 1.5 Te nanocrystals. This surface engineering strategy allows for precise adjustment of Cu/Te ratios and results in a reversible phase transition at around 600 K in Cu 1.5– x Te–Cu 2 Se nanocomposites, as systematically confirmed by in situ high-temperature X-ray diffraction combined with differential scanning calorimetry analysis. The phase transition leads to a conversion from metallic-like to semiconducting-like TE properties. Additionally, a layer of Cu 2 Se generated around Cu 1.5– x Te nanoparticles effectively inhibits Cu 1.5– x Te grain growth, minimizing thermal conductivity and decreasing hole concentration. These properties indicate that copper telluride based compounds have a promising thermoelectric potential, translated into a high dimensionless zT of 1.3 at 560 K.
Source: openalex_inverted_index · Quality: baseline
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
Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
University of Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China
Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria
Institute of Zhejiang University-Quzhou, 99 Zheda Rd., Quzhou 324000, Zhejiang, People's Republic of China
Institute for Advanced Study, Chengdu University, 610106 Chengdu, People's Republic of China
ICREA, Pg. Lluis Companys 23, 08010 Barcelona, Catalonia, Spain
Funding
Agencia Estatal de Investigaci?n · European Regional Development Fund · Ministerio de Econom?a y Competitividad · Natural Science Foundation of Sichuan Province · Generalitat de Catalunya · China Scholarship Council · Universitat Aut?noma de Barcelona · National Natural Science Foundation of China · Universitat de Barcelona · Anhui Province
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