Ultrafast narrowband exciton routing within layered perovskite nanoplatelets enables low-loss luminescent solar concentrators

Mingyang Wei, F. Pelayo García Arquer, Grant Walters, Zhenyu Yang, Li Na Quan, Younghoon Kim, Randy Sabatini, Rafael Quintero-Bermudez, Liang Gao, James Z. Fan, Fengjia Fan, Aryeh Gold-Parker, Michael F. Toney and Edward H. Sargent ()
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Mingyang Wei: University of Toronto
F. Pelayo García Arquer: University of Toronto
Grant Walters: University of Toronto
Zhenyu Yang: University of Toronto
Li Na Quan: University of Toronto
Younghoon Kim: University of Toronto
Randy Sabatini: University of Toronto
Rafael Quintero-Bermudez: University of Toronto
Liang Gao: University of Toronto
James Z. Fan: University of Toronto
Fengjia Fan: University of Toronto
Aryeh Gold-Parker: SLAC National Accelerator Laboratory
Michael F. Toney: SLAC National Accelerator Laboratory
Edward H. Sargent: University of Toronto

Nature Energy, 2019, vol. 4, issue 3, 197-205

Abstract: Abstract In luminescent solar concentrator (LSC) systems, broadband solar energy is absorbed, down-converted and waveguided to the panel edges where peripheral photovoltaic cells convert the concentrated light to electricity. Achieving a low-loss LSC requires reducing the reabsorption of emitted light within the absorbing medium while maintaining high photoluminescence quantum yield (PLQY). Here we employ layered hybrid metal halide perovskites—ensembles of two-dimensional perovskite domains—to fabricate low-loss large-area LSCs that fulfil this requirement. We devised a facile synthetic route to obtain layered perovskite nanoplatelets (PNPLs) that possess a tunable number of layers within each platelet. Efficient ultrafast non-radiative exciton routing within each PNPL (0.1 ps−1) produces a large Stokes shift and a high PLQY simultaneously. Using this approach, we achieve an optical quantum efficiency of 26% and an internal concentration factor of 3.3 for LSCs with an area of 10 × 10 cm2, which represents a fourfold enhancement over the best previously reported perovskite LSCs.

Date: 2019
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DOI: 10.1038/s41560-018-0313-y

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