Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.197
Publication date: 7th February 2022
Luminescent colloidal CdSe quantum dots (QDs) provide an opportunity to cover a wide range of emission wavelengths across the visible spectrum. Their high-temperature synthesis procedures offer crystalline materials with precise dimensions and well-defined optoelectronic properties. However, the core-only CdSe QDs show low photoluminescence (PL) quantum efficiency (QE) due to inefficient surface passivation by organic ligands, leading to charge trapping. Core/shell CdSe/CdS nanostructures with wurzite CdSe cores are known to improve the PL QE and long-term stability. A small lattice mismatch of 4% between the crystal structures of CdSe and CdS offers to grow a thick or giant CdS shell. Due to the electron delocalization in CdSe/CdS giant shell nanocrystals (NCs), the PL lifetime can be tuned from a few nanoseconds to microseconds. In this project, we studied a straight forward approach to synthesize high quality CdSe/CdS NCs with near-unity PL QE. Design of experiments (DOE), a statistics supported approach, is used to define the influence of reaction parameters in order to achieve a better synthesis procedure. Thirteen experiments were performed according to the DOE and monitored at 13 respective points for each experiment. PL QE and CdS shell thickness were analyzed with respect to all the variables used in DOE. PL QE up to 97 % has been achieved. Positive and negative effects were analyzed and optimal condition for the factors has been discussed.
Keywords Colloidal quantum dots, core/shell nanostructures, near unity PL QY, Design of experiments
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