气候变化领域集成服务门户(CCPortal): Gram-scale synthesis of carbon quantum dots with a large Stokes shift for the fabrication of eco-friendly and high-efficiency luminescent solar concentrators

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DOI	10.1039/d0ee02235g
	Gram-scale synthesis of carbon quantum dots with a large Stokes shift for the fabrication of eco-friendly and high-efficiency luminescent solar concentrators
	Zhao H.; Liu G.; You S.; Camargo F.V.A.; Zavelani-Rossi M.; Wang X.; Sun C.; Liu B.; Zhang Y.; Han G.; Vomiero A.; Gong X.
发表日期	2021
ISSN	17545692
起始页码	396
结束页码	406
卷号	14 期号:1
英文摘要	Luminescent solar concentrators (LSCs) are large-area sunlight collectors coupled to small area solar cells, for efficient solar-to-electricity conversion. The three key points for the successful market penetration of LSCs are: (i) removal of light losses due to reabsorption during light collection; (ii) high light-to-electrical power conversion efficiency of the final device; (iii) long-term stability of the LSC structure related to the stability of both the matrix and the luminophores. Among various types of fluorophores, carbon quantum dots (C-dots) offer a wide absorption spectrum, high quantum yield, non-toxicity, environmental friendliness, low-cost, and eco-friendly synthetic methods. However, they are characterized by a relatively small Stokes shift, compared to inorganic quantum dots, which limits the highest external optical efficiency that can be obtained for a large-area single-layer LSC (>100 cm2) based on C-dots below 2%. Herein, we report highly efficient large-area LSCs (100-225 cm2) based on colloidal C-dots synthesized via a space-confined vacuum-heating approach. This one batch reaction could produce Gram-scale C-dots with a high quantum yield (QY) (~65%) using eco-friendly citric acid and urea as precursors. Thanks to their very narrow size distribution, the C-dots produced via the space-confined vacuum-heating approach had a large Stokes shift of 0.53 eV, 50% larger than C-dots synthesized via a standard solvothermal reaction using the same precursors with a similar absorption range. The large-area LSC (15 × 15 × 0.5 cm3) prepared by using polyvinyl pyrrolidone (PVP) polymer as a matrix exhibited an external optical efficiency of 2.2% (under natural sun irradiation, 60 mW cm-2, uncharacterized spectrum). After coupling to silicon solar cells, the LSC exhibited a power conversion efficiency (PCE) of 1.13% under natural sunlight illumination (20 mW cm-2, uncharacterized spectrum). These unprecedented results were obtained by completely suppressing the reabsorption losses during light collection, as proved by optical spectroscopy. These findings demonstrate the possibility of obtaining eco-friendly, high-efficiency, large-area LSCs through scalable production techniques, paving the way to the lab-to-fab transition of this kind of devices. © The Royal Society of Chemistry.
英文关键词	Absorption spectroscopy; Carbon; Carbon Quantum Dots; Conversion efficiency; Efficiency; Environmental protection; Flowcharting; Luminescence; Nanocrystals; Quantum yield; Semiconductor quantum dots; Solar cells; Sols; Urea; Environmental friendliness; Inorganic quantum dots; Luminescent solar concentrators; Narrow size distributions; Optical spectroscopy; Polyvinyl pyrrolidone; Power conversion efficiencies; Solvothermal reactions; Solar concentrators; activated carbon; energy efficiency; equipment; luminescence; quantum mechanics; Stokes formula
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190822
作者单位	State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, China; College of Physics, University Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, China; Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, 971 87, Sweden; Dipartimento di Fisica and Dipartimento di Energia, Politecnico di Milano, via G. Ponzio 34/3 and IFN-CNR, piazza L. da Vinci 32, Milano, 20133, Italy; College of Textiles and Clothing, Qingdao University, No. 308 Ningxia Road, Qingdao, 266071, China; Department of Molecular Science and Nano Systems, Ca' Foscari University of Venice, Via Torino 155, Venezia Mestre, 30172, Italy; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan Hubei, 430070, China
推荐引用方式 GB/T 7714	Zhao H.,Liu G.,You S.,et al. Gram-scale synthesis of carbon quantum dots with a large Stokes shift for the fabrication of eco-friendly and high-efficiency luminescent solar concentrators[J],2021,14(1).
APA	Zhao H..,Liu G..,You S..,Camargo F.V.A..,Zavelani-Rossi M..,...&Gong X..(2021).Gram-scale synthesis of carbon quantum dots with a large Stokes shift for the fabrication of eco-friendly and high-efficiency luminescent solar concentrators.Energy & Environmental Science,14(1).
MLA	Zhao H.,et al."Gram-scale synthesis of carbon quantum dots with a large Stokes shift for the fabrication of eco-friendly and high-efficiency luminescent solar concentrators".Energy & Environmental Science 14.1(2021).