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Large area absorbers with localized defect emission are of interest for energy concentration via the antenna effect. Transfer between 2D and 0D quantum-confined structures is advantageous as it affords maximal lateral area antennas with continuously tunable emission. We report the quantum efficiency of energy transfer in in situ grown HgTe nanoplatelet (NPL)/quantum dot (QD) heterostructures to be near unity (>85%), while energy transfer in separately synthesized and well separated solutions of HgTe NPLs to QDs only reaches 47 ± 11% at considerably higher QD concentrations. Using Kinetic Monte Carlo simulations, we estimate an exciton diffusion constant of 1–10 cm2/s in HgTe NPLs, the same magnitude as that of 2D semiconductors. We also simulate in-solution energy transfer between NPLs and QDs, recovering an R–4 dependence consistent with 2D-0D near-field energy transfer even in randomly distributed NPL/QD mixtures. This highlights the advantage of NPLs 2D morphology and the efficiency of NPL/QD heterostructures and mixtures for energy harvesting.more » « lessFree, publicly-accessible full text available October 26, 2024
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Anderson, Craig M. ; Coffey, Belle ; Morales, Leslie ; Greenberg, Matthew W. ; Norman, Matthew ; Weinstein, Michael ; Brown, Garrett ; Tanski, Joseph M. ( , ACS Omega)null (Ed.)
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Coffey, Belle ; Clough, Lily ; Bartkus, Daphne D. ; McClellan, Ian C. ; Greenberg, Matthew W. ; LaFratta, Christopher N. ; Tanski, Joseph M. ; Anderson, Craig M. ( , ACS Omega)