Solution-based synthesis and processing of Sn- and Bi-doped Cu<inf>3</inf>SbSe<inf>4</inf> nanocrystals, nanomaterials and ring-shaped thermoelectric generators

Yu Liu, Gregorio García, Silvia Ortega, Doris Cadavid, Pablo Palacios, Jinyu Lu, Maria Ibáñez, Lili Xi, Jonathan De Roo, Antonio M. López, Sara Martí-Sánchez, Ignasi Cabezas, María de la Mata, Zhishan Luo, Chaochao Dun, Oleksandr Dobrozhan, David L. Carroll, Wenqing Zhang, José Martins, Maksym V. KovalenkoJordi Arbiol, German Noriega, Jiming Song, Perla Wahnón, Andreu Cabot

    Research output: Contribution to journalArticleResearchpeer-review

    44 Citations (Scopus)

    Abstract

    © The Royal Society of Chemistry. Copper-based chalcogenides that comprise abundant, low-cost, and environmental friendly elements are excellent materials for a number of energy conversion applications, including photovoltaics, photocatalysis, and thermoelectrics (TE). In such applications, the use of solution-processed nanocrystals (NCs) to produce thin films or bulk nanomaterials has associated several potential advantages, such as high material yield and throughput, and composition control with unmatched spatial resolution and cost. Here we report on the production of Cu3SbSe4 (CASe) NCs with tuned amounts of Sn and Bi dopants. After proper ligand removal, as monitored by nuclear magnetic resonance and infrared spectroscopy, these NCs were used to produce dense CASe bulk nanomaterials for solid state TE energy conversion. By adjusting the amount of extrinsic dopants, dimensionless TE figures of merit (ZT) up to 1.26 at 673 K were reached. Such high ZT values are related to an optimized carrier concentration by Sn doping, a minimized lattice thermal conductivity due to efficient phonon scattering at point defects and grain boundaries, and to an increase of the Seebeck coefficient obtained by a modification of the electronic band structure with Bi doping. Nanomaterials were further employed to fabricate ring-shaped TE generators to be coupled to hot pipes, which provided 20 mV and 1 mW per TE element when exposed to a 160 °C temperature gradient. The simple design and good thermal contact associated with the ring geometry and the potential low cost of the material solution processing may allow the fabrication of TE generators with short payback times.
    Original languageEnglish
    Pages (from-to)2592-2602
    JournalJournal of Materials Chemistry A
    Volume5
    Issue number6
    DOIs
    Publication statusPublished - 1 Jan 2017

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