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Red-emissive carbon quantum dots enable high efficiency luminescent solar concentrators
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. College of Textiles & Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road Qingdao 266071 P. R. China; Department of Physics, Yantai University, Yantai 264005 P. R. China.ORCID iD: 0009-0004-3703-9221
Dipartimento di Energia, Politecnico di Milano, via G. Ponzio 34/3 and IFN-CNR, piazza L. da Vinci 32 Milano 20133 Italy.ORCID iD: 0000-0001-9910-0391
College of Textiles & Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road Qingdao 266071 P. R. China.
College of Textiles & Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road Qingdao 266071 P. R. China.ORCID iD: 0000-0003-1057-9522
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2023 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 11, no 16, p. 8950-8960Article in journal (Refereed) Published
Abstract [en]

Luminescent solar concentrators (LSCs) are large-area sunlight collectors for efficient solar-to-electricity conversion. The key point for highly efficient LSCs is the choice of fluorophores, which need to have broad absorption, high quantum yield and large Stokes shift. Among various fluorophores, carbon quantum dots (C-dots) hold great promise as eco-friendly alternatives to heavy-metal-containing quantum dots (QDs) due to their adjustable absorption and emission spectra, non-toxicity, low cost and eco-friendly synthetic methods. However, due to the limited absorption band and relatively low quantum yield in the red region, it is a challenge to obtain efficient LSCs based on C-dots. Here, we demonstrated highly efficient LSCs based on red-emissive C-dots. The as-synthesized C-dots have a cubic structure, broad absorption covering 300-600 nm, and red emission (peak located at 595 nm), with a high quantum yield of ∼65% and a large Stokes shift of 0.45 eV. Transient absorption experiments of the C-dots revealed the ultrafast formation of the broad emissive state (1 ps). Based on the excellent optical properties of the C-dots, the as-prepared large-area LSC (10 × 10 × 0.52 cm3) exhibited an optimized external optical efficiency of 4.81% and a power conversion efficiency of 2.41% under natural sun irradiation (70 mW cm−2). Furthermore, a tandem LSC using green-emissive C-dots (top layer) and red-emissive C-dots (bottom layer) as fluorophores exhibited an external optical efficiency as high as 6.78%. These findings demonstrate the possibility of using eco-friendly carbon-based nanomaterials for highly efficient large-area LSCs.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023. Vol. 11, no 16, p. 8950-8960
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Other Physics Topics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-96651DOI: 10.1039/d2ta09972aISI: 000963108100001Scopus ID: 2-s2.0-85152094842OAI: oai:DiVA.org:ltu-96651DiVA, id: diva2:1751905
Funder
The Kempe FoundationsKnut and Alice Wallenberg FoundationLuleå University of Technology
Note

Validerad;2023;Nivå 2;2023-07-20 (sofila);

Funder: Ca‘ Foscari University of Venice; Shandong Natural Science Funds for Distinguished Young Scholar (ZR2020JQ20); ÅFORSK Foundation; National Key Research and Development Program of China (2019YFE0121600)

Available from: 2023-04-20 Created: 2023-04-20 Last updated: 2023-07-20Bibliographically approved

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Liu, GuijuVomiero, Alberto

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