Northwestern Chemistry welcomes Professor Seokhyoung Kim from Michigan State University, hosted by Professor Mercouri Kanatzidis.
Non-Equilibrium Growth of Doped Low-Dimensional Semiconducting Quantum Building Blocks
In the search for new quantum building blocks for future energy and information technologies, low- dimensional hybrid halide perovskites have gained considerable attention as a versatile and promising class of materials. Over the past several years, my research group has demonstrated that vapor-phase non-equilibrium growth enables unique chemical control that is inaccessible through solution-based syntheses, opening access to new materials, crystal structures, morphologies, and associated electronic, magnetic, and quantum-optical properties. In this presentation, I will introduce our recent efforts to develop semiconducting quantum materials using a chemical vapor deposition (CVD) growth platform that provides unusual control over lattice structure, crystal morphology, and dopant incorporation. I will discuss how the growth of defect-free single crystals, combined with the deliberate introduction of metal impurities, offers a rich playground for exploring emergent magnetic properties in semiconducting perovskites and provides a new way of thinking about doping effects in monocrystalline hybrid 2D materials that have been largely overlooked in prior studies. I will also present photophysical behaviors of two-dimensional vacancy-ordered Cs3Bi2Br9, in which dopants are introduced into interlayer vacancy sites. These interlayer dopants form bound interlayer excitons, a unique excited quasiparticle that exhibits bright light emission with radiative lifetimes prolonged by orders of magnitude. I will discuss their detailed structure-property relationships and future prospects for tailoring these materials toward sustainable and energy-efficient information technologies.
Ruth Barrera
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