\n Discovering New Ways to Make and M
odify Quantum Dots: Pushing the Frontiers of Precision Structure and Func
tion
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\n Brandi Cossairt\, Lloyd E. and Florence M
. West Endowed Professor\, Department of Chemistry\, University of Washin
gton
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\n Abstract: We are interested in develop ing colloidal nanocrystals for applications in classical and quantum ligh t technologies. Our approach leverages the extraordinary properties of na noscale systems and applies foundational design principles from molecular inorganic chemistry. In this talk\, we will examine strategies to overco me challenges in atomically precise synthesis and single particle placeme nt by exploiting the extremes of nanocrystal size. First\, the formation of kinetically persistent cluster molecules as intermediates in the nucle ation of colloidal nanocrystals makes these materials of great interest f or determining and controlling mechanisms of crystal growth. These cluste rs are also high-fidelity models for understanding the structure\, bondin g\, and reactivity of larger nanocrystals\, which are characterized by en semble heterogeneity. The interconnection between structurally distinct m embers of these families\, as well as their interconversion and conversio n to larger nanocrystals\, will be discussed. Next\, producing scalable q uantum photonics platforms using colloidal QDs as single-photon emitters is an outstanding challenge in quantum information science. We will explo re two methods to exploit QD size to facilitate the deterministic positio ning of single QDs into large arrays while maintaining their photostabili ty and single-photon emission properties. Specifically\, SiO2 and CdS she lling result in an increase in the QD physical size to allow precise posi tioning into ordered arrays using high-fidelity template-assisted self-as sembly and electrohydrodynamic inkjet printing. We show that single "colo ssal" QDs before and after assembly exhibit antibunching behavior at room temperature and can be deterministically positioned on photonic cavities .\n
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