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Title: Tandem luminescent solar concentrators based on engineered quantum dots

Luminescent solar concentrators (LSCs) can serve as large-area sunlight collectors for terrestrial and space-based photovoltaics. Due to their high emission efficiencies and readily tunable emission and absorption spectra, colloidal quantum dots have emerged as a new and promising type of LSC fluorophore. Spectral tunability of the quantum dots also facilitates the realization of stacked multilayered LSCs, where enhanced performance is obtained through spectral splitting of incident sunlight, as in multijunction photovoltaics. Here, we demonstrate a large-area (>230 cm 2) tandem LSC based on two types of nearly reabsorption-free quantum dots spectrally tuned for optimal solar-spectrum splitting. This prototype device exhibits a high optical quantum efficiency of 6.4% for sunlight illumination and solar-to-electrical power conversion efficiency of 3.1%. In conclusion, the efficiency gains due to the tandem architecture over single-layer devices quickly increase with increasing LSC size and can reach more than 100% in structures with window sizes of more than 2,500 cm 2.
Authors:
 [1] ;  [2] ; ORCiD logo [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chinese Academy of Sciences, Dalian (China)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Beijing Institute of Technology, Beijing (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-31488
Journal ID: ISSN 1749-4885
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Photonics
Additional Journal Information:
Journal Volume: 12; Journal Issue: 2; Journal ID: ISSN 1749-4885
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY
OSTI Identifier:
1481145

Wu, Kaifeng, Li, Hongbo, and Klimov, Victor Ivanovich. Tandem luminescent solar concentrators based on engineered quantum dots. United States: N. p., Web. doi:10.1038/s41566-017-0070-7.
Wu, Kaifeng, Li, Hongbo, & Klimov, Victor Ivanovich. Tandem luminescent solar concentrators based on engineered quantum dots. United States. doi:10.1038/s41566-017-0070-7.
Wu, Kaifeng, Li, Hongbo, and Klimov, Victor Ivanovich. 2018. "Tandem luminescent solar concentrators based on engineered quantum dots". United States. doi:10.1038/s41566-017-0070-7.
@article{osti_1481145,
title = {Tandem luminescent solar concentrators based on engineered quantum dots},
author = {Wu, Kaifeng and Li, Hongbo and Klimov, Victor Ivanovich},
abstractNote = {Luminescent solar concentrators (LSCs) can serve as large-area sunlight collectors for terrestrial and space-based photovoltaics. Due to their high emission efficiencies and readily tunable emission and absorption spectra, colloidal quantum dots have emerged as a new and promising type of LSC fluorophore. Spectral tunability of the quantum dots also facilitates the realization of stacked multilayered LSCs, where enhanced performance is obtained through spectral splitting of incident sunlight, as in multijunction photovoltaics. Here, we demonstrate a large-area (>230 cm2) tandem LSC based on two types of nearly reabsorption-free quantum dots spectrally tuned for optimal solar-spectrum splitting. This prototype device exhibits a high optical quantum efficiency of 6.4% for sunlight illumination and solar-to-electrical power conversion efficiency of 3.1%. In conclusion, the efficiency gains due to the tandem architecture over single-layer devices quickly increase with increasing LSC size and can reach more than 100% in structures with window sizes of more than 2,500 cm2.},
doi = {10.1038/s41566-017-0070-7},
journal = {Nature Photonics},
number = 2,
volume = 12,
place = {United States},
year = {2018},
month = {1}
}

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