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Title: Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots

Authors:
; ; ; ; ORCiD logo; ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388304
DOE Contract Number:
AC52-06NA25396
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Photonics; Journal Volume: 11; Journal Issue: 3; Related Information: CASP partners with Los Alamos National Laboratory (lead); University of California, Irvine; University of Colorado; Colorado School of Mines; George Mason University; Los Alamos National Laboratory; University of Minnesota; National Renewable Energy Laboratory
Country of Publication:
United States
Language:
English
Subject:
solar (photovoltaic), solar (fuels), solid state lighting, bio-inspired, electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (scalable processing)

Citation Formats

Meinardi, Francesco, Ehrenberg, Samantha, Dhamo, Lorena, Carulli, Francesco, Mauri, Michele, Bruni, Francesco, Simonutti, Roberto, Kortshagen, Uwe, and Brovelli, Sergio. Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots. United States: N. p., 2017. Web. doi:10.1038/nphoton.2017.5.
Meinardi, Francesco, Ehrenberg, Samantha, Dhamo, Lorena, Carulli, Francesco, Mauri, Michele, Bruni, Francesco, Simonutti, Roberto, Kortshagen, Uwe, & Brovelli, Sergio. Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots. United States. doi:10.1038/nphoton.2017.5.
Meinardi, Francesco, Ehrenberg, Samantha, Dhamo, Lorena, Carulli, Francesco, Mauri, Michele, Bruni, Francesco, Simonutti, Roberto, Kortshagen, Uwe, and Brovelli, Sergio. Mon . "Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots". United States. doi:10.1038/nphoton.2017.5.
@article{osti_1388304,
title = {Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots},
author = {Meinardi, Francesco and Ehrenberg, Samantha and Dhamo, Lorena and Carulli, Francesco and Mauri, Michele and Bruni, Francesco and Simonutti, Roberto and Kortshagen, Uwe and Brovelli, Sergio},
abstractNote = {},
doi = {10.1038/nphoton.2017.5},
journal = {Nature Photonics},
number = 3,
volume = 11,
place = {United States},
year = {Mon Feb 20 00:00:00 EST 2017},
month = {Mon Feb 20 00:00:00 EST 2017}
}
  • Luminescent solar concentrators serving as semitransparent photovoltaic windows could become an important element in net zero energy consumption buildings of the future. Colloidal quantum dots are promising materials for luminescent solar concentrators as they can be engineered to provide the large Stokes shift necessary for suppressing reabsorption losses in large-area devices. Existing Stokes-shift-engineered quantum dots allow for only partial coverage of the solar spectrum, which limits their light-harvesting ability and leads to colouring of the luminescent solar concentrators, complicating their use in architecture. Here, we use quantum dots of ternary I–III–VI2 semiconductors to realize the first large-area quantum dot–luminescent solarmore » concentrators free of toxic elements, with reduced reabsorption and extended coverage of the solar spectrum. By incorporating CuInSexS2–x quantum dots into photo-polymerized poly(lauryl methacrylate), we obtain freestanding, colourless slabs that introduce no distortion to perceived colours and are thus well suited for the realization of photovoltaic windows. Thanks to the suppressed reabsorption and high emission efficiencies of the quantum dots, we achieve an optical power efficiency of 3.2%. Ultrafast spectroscopy studies suggest that the Stokes-shifted emission involves a conduction-band electron and a hole residing in an intragap state associated with a native defect.« less
  • 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 thatmore » 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 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 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