Journal
NANO LETTERS
Volume 15, Issue 2, Pages 1315-1323Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504510t
Keywords
Luminescent solar concentrator; phosphor; doped nanocrystal; nanocrystal heterostructure
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Funding
- U.S. National Science Foundation [DMR-1206221, DMR-1035512]
- U.S. Department Of Energy (Office of Energy Efficiency and Renewable Energy (DOE-EERE) Postdoctoral Research Award)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206221, 1035512] Funding Source: National Science Foundation
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Luminescent solar concentrators (LSCs) harvest sunlight over large areas and concentrate this energy onto photovoltaics or for other uses by transporting photons through macroscopic waveguides. Although attractive for lowering solar energy costs, LSCs remain severely limited by luminophore reabsorption losses. Here, we report a quantitative comparison of four types of nanocrystal (NC) phosphors recently proposed to minimize reabsorption in large-scale LSCs: two nanocrystal heterostructures and two doped nanocrystals. Experimental and numerical analyses both show that even the small core absorption of the leading NC heterostructures causes major reabsorption losses at relatively short transport lengths. Doped NCs outperform the heterostructures substantially in this critical property. A new LSC phosphor is introduced, nanocrystalline Cd1xCuxSe, that outperforms all other leading NCs by a significant margin in both small- and large-scale LSCs under full-spectrum conditions.
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