Search Results - "Armstrong, Zachary T."
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Energy cascades in donor-acceptor exciton-polaritons observed by ultrafast two-dimensional white-light spectroscopy
Published in Nature communications (27-11-2022)“…Exciton-polaritons are hybrid states formed when molecular excitons are strongly coupled to photons trapped in an optical cavity. These systems exhibit many…”
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Ultrafast Fluctuations in PM6 Domains of Binary and Ternary Organic Photovoltaic Thin Films Probed with Two-Dimensional White-Light Spectroscopy
Published in The journal of physical chemistry letters (23-09-2021)“…We present two-dimensional white-light spectroscopy (2DWL) measurements of binary and ternary bulk heterojunctions of the polymer donor PM6 mixed with…”
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Time-Domain Photothermal AFM Spectroscopy via Femtosecond Pulse Shaping
Published in Analytical chemistry (Washington) (13-09-2022)“…A time-domain version of photothermal microscopy using an atomic force microscope (AFM) is reported, which we call Fourier transform photothermal (FTPT)…”
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Thermal Annealing of Singlet Fission Microcrystals Reveals the Benefits of Charge Transfer Couplings and Slip-Stacked Packing
Published in Journal of physical chemistry. C (16-07-2020)“…Defects in molecular crystals, created by nonequilibrium crystal packing, can have significant influence over the energetics and dynamics of singlet fission…”
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Structural Disorder at the Edges of Rubrene Crystals Enhances Singlet Fission
Published in The journal of physical chemistry letters (21-12-2023)“…Materials that undergo singlet fission are of interest for their use in light-harvesting, photocatalysis, and quantum information science, but their ability to…”
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Spatial Heterogeneity of Biexcitons in Two-Dimensional Ruddlesden–Popper Lead Iodide Perovskites
Published in Journal of the American Chemical Society (23-08-2023)“…Quantum confinement in two-dimensional (2D) Ruddlesden–Popper (RP) perovskites leads to the formation of stable quasi-particles, including excitons and…”
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A Proposed Method to Obtain Surface Specificity with Pump–Probe and 2D Spectroscopies
Published in The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory (30-04-2020)“…Surfaces and interfaces are ubiquitous in nature. From cell membranes, to photovoltaic thin films, surfaces have important function in both biological and…”
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Ultrafast Two-Dimensional White-Light Spectroscopy of Excitons in Disordered Environments
Published 01-01-2022“…Excitons in semiconductors often experience disordered environments. Disorder can impact the energetics and relaxation dynamics on ultrafast timescales, both…”
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Dissertation