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Multispectral harvesting rare-earth oxysulphide based highly efficient transparent luminescent solar concentrator

Journal of Rare Earths 2022年第1期40卷 41-48页

作者： Vanjula Kataria Dalip Singh Mehta Green Photonics Laboratory Department of PhysicsIndian Institute of Technology(IIT)DelhiHauz KhasDelhi110016India

Transparent luminescent solar concentrator(LSC)is extensively regarded as the most promising sunlight tapping device for its application in buildings integrated with photovoltaics(BIPV)or as solar window *** LSCs doped with organic dyes suffered from high reabsorption losses with no transparency;whereas,recently reported heavy metal-doped quantum dots avoided such losses but possessed the risk of high toxicity and low ambient ***,luminophores with massive spectral shifts and co rdial relationships with the enviro nment are very much *** this paper,we report the fabrication of PMMA based transparent LSC embedded with nanocrystals of environmental friendiness and multispectral harvesting gadolinium oxysulphide(Gd_(2)O_(2) S:Er,Yb)*** Gd_(2)O_(2) S:Er,Yb nanofluorophore absorbs various excitation wavelengths ranging from UV to NIR and emits in the visible region offering huge Stoke’s and anti-Stoke’s shift *** non-existent reabsorption losses and overlapping maxima of Gd_(2)O_(2) S:Er,Yb nanofluorophore generated photon flux with solar cells’responsivity enhance the efficiency characteristics of the LSC *** analysis of LSC as a function of varying nanofluorophore dispersion ratio and changing edge width optimizes the fabrication process and exhibits high power conversion efficiency of-6,93%and optical efficiency of-8.57%.The LSC slab demonstrates high photostability under irradiation for prolonged hours without any dip in the emission *** Gd_(2)O_(2) S:Er,Yb nanofluorophore diffused LSC waveguide offering spectral tunability,cost-reduction,efficiency enhancement,and high concentration factor whilst being sustainable for long term use makes it a fascinating transparent solar window.

关键词： luminescent solar concentrator Gadolinium oxysulphide Stoke's shift Anti-Stoke's shift Efficiency enhancement Photostability

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Design and optimization of graphene quantum dot-based luminescent solar concentrator using Monte-Carlo simulation

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Energy and Built Environment 2023年第2期4卷 140-147页

作者： Milad Rastkar Mirzaei Ali Rostami Samiye Matloub Masoumeh Nazari ECE Department University of OklahomaNormanOklahoma73019United States Photonics and Nanocrystals Research Lab(PNRL) University of TabrizTabriz***Iran SP-EPT Lab ASEPE CompanyIndustrial Park of Advanced TechnologiesTabrizIran Quantum Photonics Research Lab(QPRL) University of TabrizTabriz***Iran

The demand for green energy is growing these days as a result of the world energy crisis,as well as global *** cells are in great interest due to the fact that solar energy can be easily converted to electricity,if the photovoltaic cell’s cost can be *** of the methods to make low-cost energy is using luminescent solar *** have the advantage of directly integrating solar cells to dense urban areas as well as *** materials and waveguide sizes have been investigated for use in luminescent solar ***,the optimized waveguide geometry and quantum dots concentrators have not been thoroughly *** this paper,we have simulated graphene quantum dots using density function theory.A Monte-Carlo ray-tracing simulation was developed to model our *** have optimized the luminescent solar concentrator geometry by Monte-Carlo *** optimization results show a 99%enhancement in the energy flux gain of the final ***,we have calculated and analyzed the fate of all photons.

关键词： luminescent solar concentrator solar cell Quantum dot Graphene Energy-efficient building Monte Carlo

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Exciton recycling via InP quantum dot funnels for luminescent solar concentrators

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Nano Research 2021年第5期14卷 1488-1494页

作者： Houman Bahmani Jalali Sadra Sadeghi Isinsu Baylam Mertcan Han Cleva W.Ow-Yang Alphan Sennaroglu Sedat Nizamoglu Graduate School of Biomedical Sciences and Engineering KoçUniversityIstanbul34450Turkey Graduate School of Material Science and Engineering KoçUniversityIstanbul34450Turkey KoçUniversity Surface Science and Technology Center(KUYTAM) KoçUniversityIstanbul34450Turkey Laser Research Laboratory KoçUniversityIstanbul34450Turkey Department of Electrical and Electronics Engineering KoçUniversityIstanbul34450Turkey Department of Material Science and Nano Engineering Sabanci UniversityIstanbul34956Turkey

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.

关键词： energy transfer indium phosphide quantum dot light harvesting luminescent solar concentrator luminescent solar concentrators(LSC)

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