Phosphonic acids aid composition adjustment in the synthesis of Cu2+x Zn1−x SnSe4−y nanoparticles
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The functional properties of quaternary I2–II–IV–VI4 nanomaterials, with potential interest in various technological fields, are highly sensitive to compositional variations, which is a challenging parameter to adjust. Here we demonstrate the presence of phosphonic acids to aid controlling the reactivity of the II element monomer to be incorporated in quaternary Cu2ZnSnSe4 nanoparticles and thus to provide a more reliable way to adjust the final nanoparticle metal ratios. Furthermore, we demonstrate the composition control in such multivalence nanoparticles to allow modifying charge carrier concentrations in nanomaterials produced from the assembly of these building blocks.
KeywordsCZTSe Nanostructured materials Colloidal synthesis Composition control Electrical transport Thermoelectric
At IREC, work was supported by European Regional Development Funds and the Framework 7 program under project UNION (FP7-NMP 310250). M.I. Thanks AGAUR for her Beatriu i Pinós post-doctoral Grant.
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