Spectrum shifting of sunlight by luminescent sheets: Performance evaluation of photovoltaic applications

Galluzzi, F.; Scafè, E.

doi:10.1016/0038-092x(84)90004-5

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…We obtained a theoretical value of η LDS =0.72 for the LDS efficiency of polyvinyl butyral (PVB) based layers. For that we assumed the refractive index of PVB to be n =1.52 at λ =600 nm, layer thicknesses 300–450 μm, and PLQY of the dyes in the layer of approximately 90 % ,. This value is marked with a star in Figure .…”

Section: Resultssupporting

confidence: 82%

“…Optical losses owing to the integration of an LDS filled polymer layer onto solar modules were calculated by Galuzzi et al. back in 1984 . The efficiency increase of any solar cell type resulting from the application of an LDS layer can be immediately estimated simply by using the absorbance and emission spectra of the luminescent material and the spectrally resolved external quantum efficiency (EQE) of the cell.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Solution‐Processed Luminescent Down‐Shifting Layers for Photovoltaics by Customizing Organic Dye Based Thick Films

et al. 2016

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We theoretically and experimentally determined the optimized film properties of luminescent down‐shifting (LDS) layers for thin film solar cells. Based on the predictions from an adapted optical model, we coated thick (300–500 μm) and efficient luminescent down‐shifting layers from environmentally friendly solvents and industrially scalable inks. LDS layers consisted of polyvinyl butyral (PVB) as binder and organic luminescent dyes as UV‐converters. The luminescence quantum yields of the dyes were studied in solution (benzyl alcohol) and for solid thick films. Our data shows that the studied dyes retain luminescent efficiencies of approximately 90 % in the solid state when processed from solution. We further apply the produced layers onto copper indium gallium diselenide (CIGS) solar cells to verify the theoretical predictions for enhancing the external quantum efficiency (EQE) in the UV region. For the best converters a remarkable enhancement of the EQE from 9 % to 52 % was recorded at 380 nm. These findings underline that printed LDS layers indeed have the potential to enhance the efficiency and the light harvesting capabilities of industrially relevant photovoltaic modules.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Optimization of Solution‐Processed Luminescent Down‐Shifting Layers for Photovoltaics by Customizing Organic Dye Based Thick Films

et al. 2016

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“…The concept of luminescent solar concentrators (LSCs) has existed for over 30 years, and with recent advances in phosphorescent and fluorescent luminophores efficiencies, the power conversion efficiency for LSC modules have increased to 7.1% using multi‐dye systems with GaAs photovoltaics 1. Although optical funneling limits the overall system conversion efficiency of LSCs to less than 10% (without LSC stacking),2 it can dramatically reduce the area of expensive solar cells needed, driving down the overall module cost 3–8. Recently, there has been refocused interest in applying LSCs as architectural windows and skins 9–11.…”

mentioning

confidence: 99%

Transparent Luminescent Solar Concentrators for Large‐Area Solar Windows Enabled by Massive Stokes‐Shift Nanocluster Phosphors

Zhao

Lunt

2013

Advanced Energy Materials

204

183

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Integrating solar-harvesting systems into the building envelope is a transformative route to improving building effi ciency, capturing large areas of solar energy, and lowering effective solar cell installation costs by piggybacking on the installation, framing, and maintenance of the existing building envelope. However, the widespread adoption of such a pathway is typically hampered by diffi culties associated with mounting traditional photovoltaic (PV) modules in non-standard confi gurations on and around buildings due to added structural cost, architectural impedance, and most importantly, aesthetics. To overcome these hurdles we have developed a luminescent solar concentrator (LSC) employing novel nanocrystal-polymer blends that allow for selective ultraviolet light harvesting that results in a high degree of visible light transmittance. These transparent LSCs offer a different route to large area scaling with high defect tolerances compared to other transparent photovoltaic devices. These systems have signifi cant potential in 1) energy scavenging electronics displays, 2) autonomous electrochromicwindows, 3) visible-blind detectors, and 4) coatings for improved UV response and protection of traditional solar installations.The concept of luminescent solar concentrators (LSCs) has existed for over 30 years, and with recent advances in phosphorescent and fl uorescent luminophores effi ciencies, the power conversion effi ciency for LSC modules have increased to 7.1% using multi-dye systems with GaAs photovoltaics. [ 1 ] Although optical funneling limits the overall system conversion effi ciency of LSCs to less than 10% (without LSC stacking), [ 2 ] it can dramatically reduce the area of expensive solar cells needed, driving down the overall module cost. [3][4][5][6][7][8] Recently, there has been refocused interest in applying LSCs as architectural windows and skins. [9][10][11] However, the limited aesthetic appeal and coloration from chromophore absorption and emission (glow) in the visible spectrum of these systems has hindered widespread adoption of such devices in window applications (see Figure 1 ).In general, windows are installed to provide natural lighting with a view; that is, most people prefer not to work behind strongly colored or glowing glass. A high level of untinted-transparency is therefore necessary for ubiquitous adoption.Previous efforts in constructing transparent or semitransparent power-producing surface have focused on 1) optically-thin photovoltaics that have signifi cant tinting or limited transmission, [ 9 , 12 ] 2) LSCs incorporating colored chromophores that have either absorption or emission in the visible spectrum, again creating signifi cant tinting, [ 13 , 14 ] or 3) focusing-optics systems using direct-light only that requires bulky solar tracking or optics. [ 15 , 16 ] Recently, selectively absorbing near-infrared photovoltaics (PV) have been fabricated by exploiting the excitonic character of molecular and organic semiconductors with efficiencies in the range of 2-4% over ...

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“…11,12 Therefore, although a large number of organic fluorophores has been tried for LDS application, few of them result in the performance improvement of the solar cell. [13][14][15] Structurally modified perylene derivatives from commercial sources (BASF Lumogen F dyes) such as Y083, Y170, O240 and R300 were first used as LDS materials to enhance the output short circuit current density ( J sc ) of the CdTe solar cell or CIGS solar cell. [16][17][18][19] Recently, several tetraphenylethylene (TPE)based organic fluorophores with both intramolecular charge transfer (ICT) and aggregation-induced emission (AIE) characteristics have been synthesized as LDS materials for the CdTe solar cell.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the output current of a CdTe solar cell via a CN-free hydrocarbon luminescent down-shifting fluorophore with intramolecular energy transfer and restricted internal rotation characteristics

Olsen

Dong

2015

Photochem Photobiol Sci

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A CN-free hydrocarbon fluorophore (Perylene-TPE) was synthesized as a new luminescent down-shifting (LDS) material. Its photophysical properties in both the solution state and the solid state were studied. The unity fluorescence quantum yield of Perylene-TPE observed in its solid state is considered to be from the characteristics of intramolecular energy transfer (IET) and restricted internal rotation (RIR). This is supported by the results from theoretical calculations and spectroscopic measurements. For the photovoltaic application of Perylene-TPE, a theoretical modeling study suggests that using the LDS film of Perylene-TPE may increase the output short circuit current density (Jsc) of a CdTe solar cell by 2.95%, enhance the spectral response of a CdTe solar cell at 400 nm by 41%, and shift the incident solar photon distribution from short-wavelength (<500 nm) to long-wavelength (>500 nm). Experimentally, placing a LDS film of Perylene-TPE on a CdTe solar cell can enhance its output Jsc by as high as 3.30 ± 0.31%, which is comparable to the current commercially available LDS material – Y083 (3.28% ± 0.37%).

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Spectrum shifting of sunlight by luminescent sheets: Performance evaluation of photovoltaic applications

Cited by 16 publications

References 9 publications

Optimization of Solution‐Processed Luminescent Down‐Shifting Layers for Photovoltaics by Customizing Organic Dye Based Thick Films

Optimization of Solution‐Processed Luminescent Down‐Shifting Layers for Photovoltaics by Customizing Organic Dye Based Thick Films

Transparent Luminescent Solar Concentrators for Large‐Area Solar Windows Enabled by Massive Stokes‐Shift Nanocluster Phosphors

Enhancing the output current of a CdTe solar cell via a CN-free hydrocarbon luminescent down-shifting fluorophore with intramolecular energy transfer and restricted internal rotation characteristics

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