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Research Article | Open Access

Exciton recycling via InP quantum dot funnels for luminescent solar concentrators

Houman Bahmani Jalali1,§, Sadra Sadeghi2,§, Isinsu Baylam3,4, Mertcan Han5, Cleva W. Ow-Yang6, Alphan Sennaroglu3,4, Sedat Nizamoglu1,2,5( )
Graduate School of Biomedical Sciences and Engineering, Koç University, Istanbul 34450, Turkey
Graduate School of Material Science and Engineering, Koç University, Istanbul 34450, Turkey
Koç University Surface Science and Technology Center (KUYTAM), Koç University, Istanbul 34450, Turkey
Laser Research Laboratory, Koç University, Istanbul 34450, Turkey
Department of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
Department of Material Science and Nano Engineering, Sabanci University, Istanbul 34956, Turkey
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An erratum to this article is available online at:
https://doi.org/10.1007/s12274-020-3282-y

Graphical Abstract

Abstract

Luminescent solar concentrators (LSC) absorb large-area solar radiation and guide down-converted emission to solar cells for electricity production. Quantum dots (QDs) have been widely engineered at device and quantum dot levels for LSCs. Here, we demonstrate cascaded energy transfer and exciton recycling at nanoassembly level for LSCs. The graded structure composed of different sized toxic-heavy-metal-free InP/ZnS core/shell QDs incorporated on copper doped InP QDs, facilitating exciton routing toward narrow band gap QDs at a high nonradiative energy transfer efficiency of 66%. At the final stage of non-radiative energy transfer, the photogenerated holes make ultrafast electronic transitions to copper-induced mid-gap states for radiative recombination in the near-infrared. The exciton recycling facilitates a photoluminescence quantum yield increase of 34% and 61% in comparison with semi-graded and ungraded energy profiles, respectively. Thanks to the suppressed reabsorption and enhanced photoluminescence quantum yield, the graded LSC achieved an optical quantum efficiency of 22.2%. Hence, engineering at nanoassembly level combined with nonradiative energy transfer and exciton funneling offer promise for efficient solar energy harvesting.

Keywords

energy transferindium phosphidequantum dotlight harvestingluminescent solar concentratorluminescent solar concentrators (LSC)

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1488-1494
DOI: 10.1007/s12274-020-3207-9
Cite this article:
Jalali HB, Sadeghi S, Baylam I, et al. Exciton recycling via InP quantum dot funnels for luminescent solar concentrators. Nano Research, 2021, 14(5): 1488-1494. https://doi.org/10.1007/s12274-020-3207-9
Topics:
CopperEnergy gapHeavy metalsIIIIndium phosphideInfrared devices NanocrystalsPhotoluminescenceQuantum yieldSemiconducting indium phosphide Semiconductor quantum dotsSol-cellsSolar concentratorsSolar energyV semiconductorsZinc compounds

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Received: 06 August 2020
Revised: 20 October 2020
Accepted: 22 October 2020
Published: 19 November 2020
© The Author(s) 2020

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