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Title: Quality factor of luminescent solar concentrators and practical concentration limits attainable with semiconductor quantum dots

In this study, luminescent solar concentrators (LSCs) can be utilized as both large-area collectors of solar radiation supplementing traditional photovoltaic cells as well as semitransparent “solar windows” that provide a desired degree of shading and simultaneously serve as power-generation units. An important characteristic of an LSC is a concentration factor (C) that can be thought of as a coefficient of effective enlargement (or contraction) of the area of a solar cell when it is coupled to the LSC. Here we use analytical and numerical Monte Carlo modeling in addition to experimental studies of quantum-dot-based LSCs to analyze the factors that influence optical concentration in practical devices. Our theoretical model indicates that the maximum value of C achievable with a given fluorophore is directly linked to the LSC quality factor (Q LSC) defined as the ratio of absorption coefficients at the wavelengths of incident and reemitted light. In fact, we demonstrate that the ultimate concentration limit (C 0) realized in large-area devices scales linearly with the LSC quality factor and in the case of perfect emitters and devices without back reflectors is approximately equal to Q LSC. To test the predictions of this model, we conduct experimental studies of LSCs basedmore » on visible-light emitting II–VI core/shell quantum dots with two distinct LSC quality factors. We also investigate devices based on near-infrared emitting CuInSe xS 2–x quantum dots for which the large emission bandwidth allows us to assess the impact of varied Q LSC on the concentration factor by simply varying the detection wavelength. In all cases, we find an excellent agreement between the model and the experimental observations, suggesting that the developed formalism can be utilized for express evaluation of prospective LSC performance based on the optical spectra of LSC fluorophores, which should facilitate future efforts on the development of high-performance devices based on quantum dots as well as other types of emitters.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. UbiQD, LLC, Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-23207
Journal ID: ISSN 2330-4022
Grant/Contract Number:
AC52-06NA25396
Type:
Published Article
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2330-4022
Publisher:
American Chemical Society (ACS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; material science; concentration factor; LSC; LSC quality factor; luminescent solar concentrator; optical efficiency; quantum dot
OSTI Identifier:
1413787
Alternate Identifier(s):
OSTI ID: 1340973

Klimov, Victor I., Baker, Thomas A., Lim, Jaehoon, Velizhanin, Kirill A., and McDaniel, Hunter. Quality factor of luminescent solar concentrators and practical concentration limits attainable with semiconductor quantum dots. United States: N. p., Web. doi:10.1021/acsphotonics.6b00307.
Klimov, Victor I., Baker, Thomas A., Lim, Jaehoon, Velizhanin, Kirill A., & McDaniel, Hunter. Quality factor of luminescent solar concentrators and practical concentration limits attainable with semiconductor quantum dots. United States. doi:10.1021/acsphotonics.6b00307.
Klimov, Victor I., Baker, Thomas A., Lim, Jaehoon, Velizhanin, Kirill A., and McDaniel, Hunter. 2016. "Quality factor of luminescent solar concentrators and practical concentration limits attainable with semiconductor quantum dots". United States. doi:10.1021/acsphotonics.6b00307.
@article{osti_1413787,
title = {Quality factor of luminescent solar concentrators and practical concentration limits attainable with semiconductor quantum dots},
author = {Klimov, Victor I. and Baker, Thomas A. and Lim, Jaehoon and Velizhanin, Kirill A. and McDaniel, Hunter},
abstractNote = {In this study, luminescent solar concentrators (LSCs) can be utilized as both large-area collectors of solar radiation supplementing traditional photovoltaic cells as well as semitransparent “solar windows” that provide a desired degree of shading and simultaneously serve as power-generation units. An important characteristic of an LSC is a concentration factor (C) that can be thought of as a coefficient of effective enlargement (or contraction) of the area of a solar cell when it is coupled to the LSC. Here we use analytical and numerical Monte Carlo modeling in addition to experimental studies of quantum-dot-based LSCs to analyze the factors that influence optical concentration in practical devices. Our theoretical model indicates that the maximum value of C achievable with a given fluorophore is directly linked to the LSC quality factor (QLSC) defined as the ratio of absorption coefficients at the wavelengths of incident and reemitted light. In fact, we demonstrate that the ultimate concentration limit (C0) realized in large-area devices scales linearly with the LSC quality factor and in the case of perfect emitters and devices without back reflectors is approximately equal to QLSC. To test the predictions of this model, we conduct experimental studies of LSCs based on visible-light emitting II–VI core/shell quantum dots with two distinct LSC quality factors. We also investigate devices based on near-infrared emitting CuInSexS2–x quantum dots for which the large emission bandwidth allows us to assess the impact of varied QLSC on the concentration factor by simply varying the detection wavelength. In all cases, we find an excellent agreement between the model and the experimental observations, suggesting that the developed formalism can be utilized for express evaluation of prospective LSC performance based on the optical spectra of LSC fluorophores, which should facilitate future efforts on the development of high-performance devices based on quantum dots as well as other types of emitters.},
doi = {10.1021/acsphotonics.6b00307},
journal = {ACS Photonics},
number = 6,
volume = 3,
place = {United States},
year = {2016},
month = {5}
}