Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Despite the many years of synthesis of colloidal semiconductor nanocrystals their synthesis protocols are still optimized. It is because the highest possible monodispersity is required for many of the practical applications containing nanocrystals as an optically active centers. In our research, we focused on the time evolution of the nanocrystals monodispersity during growth.
Three distinguished synthesis protocols of CdSe nanocrystals were tested during which measurements of absorbance and photoluminescence spectra were performed with one second interval. The spectra were precisely analyzed in order to distinguish the peaks positions and their broadenings. These features are strictly connected with nanocrystals size and size distribution, respectively. We revealed that the size of nanocrystals change nonmonotonicaly in the time of growth. Moreover, at the specific absorption peak positions, which means at the specific nanocrystals size, the minimum of peaks broadening occurred periodically. We discuss on the possible growth mechanisms resulting in the observed changes of nanocrystals optical properties. These results gives deeper insight into a growth process of colloidal nanocrystals.
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