Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
In this work, we carry out a complete study of shape control in the CZTS (Cu2ZnSnS4) nanocrystal system. Aliquot studies are used to track the nucleation and growth in the early stages as particles initially form as binary copper sulphides before progressive incorporation of zinc and tin. It was possible to in-situ follow the reaction in real time using a custom built reaction flask while recording X-ray absorption near edge spectra (XANES) at the K-edge of Cu and Zn. This allowed, identification of the precise temperature dependence of the diffusion of Sn4+ and Zn2+ ions into the nanocrystals to form quaternary CZTS. After the desired composition is reached, the subsqequent growth of the particle allows for a reaction windows for shape control whereby solely varying the concentration of amine solvent in the reaction, we observe the formation of nanorods and ellipsoids, as well as atypical tadpole-shaped and P-shaped nanocrystals. We further show how changing the precursors used for the synthesis, specifically the copper and zinc precursor, influences the reaction environment, allowing the evolution of multi-phase polytypic CZTS nanocrystals with wurtzite and zinc blende domains.
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