Composition control and thermoelectric properties of quaternary chalcogenide nanocrystals: The case of stannite Cu <inf>2</inf>CdSnSe <inf>4</inf>

Maria Ibáñez, Doris Cadavid, Reza Zamani, Nuria García-Castelló, Victor Izquierdo-Roca, Wenhua Li, Andrew Fairbrother, Joan Daniel Prades, Alexey Shavel, Jordi Arbiol, Alejandro Pérez-Rodríguez, Joan Ramon Morante, Andreu Cabot

    Research output: Contribution to journalArticleResearchpeer-review

    134 Citations (Scopus)

    Abstract

    A high-yield and upscalable colloidal synthesis route for the production of quaternary I 2-II-IV-VI 4 nanocrystals, particularly stannite Cu 2+xCd 1-xSnSe 4, with narrow size distribution and precisely controlled composition is presented. It is also shown here how the diversity of valences in the constituent elements allows an effective control of their electrical conductivity through the adjustment of the cation ratios. At the same time, while the crystallographic complexity of quaternary chalcogenides is associated with intrinsically low thermal conductivities, the reduction of the lattice dimensions to the nanoscale further reduces the materials thermal conductivity. In the specific case of the stannite crystal structure, a convenient slab distribution of the valence band maximum states permits a partial decoupling of the p-type electrical conductivity from both the Seebeck coefficient and the thermal conductivity. Combining these features, we demonstrate how an initial optimization of the nanocrystals Cd/Cu ratio allowed us to obtain low-temperature solution-processed materials with ZT values up to 0.71 at 685 K. © 2012 American Chemical Society.
    Original languageEnglish
    Pages (from-to)562-570
    JournalChemistry of Materials
    Volume24
    Issue number3
    DOIs
    Publication statusPublished - 14 Feb 2012

    Keywords

    • chalcogenide
    • colloidal synthesis
    • nanocrystal
    • semiconductor nanoparticle
    • stannite
    • thermoelectric

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