Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.099
Publication date: 18th July 2019
Intermediate band gap (IB) semiconductors represent an interesting class of materials for both photovoltaic and optoelectronic applications. Yet, very few examples exist of IB nanocrystals and very little is known about their size-dependent properties. Here, we present our work on the development of a colloidal hot-injection method to synthetize highly uniform, cube-shaped IB Cu3VS4 NCs with tunable edge length of 9, 12, and 18 nm.1 At first, we investigated the reaction mechanism by complementing XRD and transmission electron microscopy (TEM). We found an in situ seed-mediated growth with CuxS (where x = 1, 2) nanoparticles reacting with V molecular precursor to form the Cu3VS4 NCs. Then, we explored the optoelectronic properties of the as-synthesized Cu3VS4 NCs by means of UV-Vis spectroscopy and DFT calculations. The optical spectra showed three distinct absorption peaks, which blue-shift with the decreasing NC size, which is explained as result of quantum confinement effects and chemical environment by the DFT calculations. By introducing a novel class of IB NCs and investigating their size-dependent optical properties, this study contributes on one side to expand the chemistry of multinary semiconductor materials, which are often challenging to obtain as pure compounds under kinetic control, and on the other side to deepen the fundamental knowledge of how materials properties change at the nanoscale.
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