PL and PLE studies of KMgF3:Sm crystal and the effect of its wavelength conversion on CdS/CdTe solar cell

Hong, Byung‐Chul; Kawano, Katsuyasu

doi:10.1016/j.solmat.2003.06.013

Cited by 66 publications

(51 citation statements)

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“…P m is proportional to J sc from the relationship P m = J sc V oc FF and so, FF and V oc to be nearly uninfluenced under the operation of the spectral downconverter. 40 It can be seen that the inclusion of a spectral downconverter based on Pr 3+ -Yb 3+ codoped fluoride glass allows for a better use of the solar spectrum. Since the simulated sc-Si solar cell Eff is improved after incorporating enhancement mechanism of sc-Si solar cells employing spectral DC, the potential benefits for actual sc-Si solar cells are expected.…”

Section: F the Simulated Performance Of A Sc-si Solar Cellmentioning

confidence: 99%

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Song

Jiang

2012

AIP Advances

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Quantum cutting via a two-step resonant energy transfer in a spectral downconverter of Pr3+-Yb3+ codoped fluoride glass is investigated numerically by proposing up and solving the theoretical model of rate equations and power propagation equations. Based on the optimal Pr3+-Yb3+ concentration and the thickness of the spectral downconverter, the total power conversion efficiency of 175% and total quantum conversion efficiency of 186% are obtained. The performance of a sc-Si solar cell covered with a spectral downconverter is evaluated with the photovoltaic simulation programme PC1D. For sc-Si solar cells, the energy conversion efficiency of 14.90% for the modified AM1.5G compared to a 12.25% energy conversion efficiency for the standard AM1.5G has been obtained, and the simulated relative energy conversion efficiency for the sc-Si solar cell approaches up to 1.21. Our results show that the use of a spectral downconverter yields better sc-Si solar cell performance compared to the standard AM1.5G irradiation. The paper also provides a framework for investigating and optimizing the rare-earth doped spectral downconverter, potentially enabling a sc-Si solar cell with an efficiency improvement

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Section: F the Simulated Performance Of A Sc-si Solar Cellmentioning

confidence: 99%

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Song

Jiang

2012

AIP Advances

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“…From this data the gain or loss at each wavelength l can be quantified, and furthermore, the change in the module's short-circuit current density DJ SC can be calculated for any incident spectrum. LDS layers have been assessed by EQE measurements on encapsulated cells manufactured from amorphous silicon (a-Si), 2 cadmium sulphide (CdS) heterojunctions with copper sulfide (Cu 2 S) 2 and cadmium telluride (CdTe), [3][4][5][6] and copper indium gallium diselenide (CIGS) 7 substrates. But to our knowledge, an EQE measurement on LDS-encapsulated crystalline silicon (c-Si) cells has not been reported since 1981 8 and has never been converted to DJ SC for terrestrial solar spectra.…”

Section: Introductionmentioning

confidence: 99%

Increase in external quantum efficiency of encapsulated silicon solar cells from a luminescent down‐shifting layer

McIntosh

Cotsell

Hanton

et al. 2008

Progress in Photovoltaics

137

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This paper reports the external quantum efficiency (EQE) of encapsulated screen-printed crystalline silicon solar cells, where the encapsulation includes a layer of luminescent down-shifting (LDS) molecules. At wavelengths less than 400 nm, the inclusion of the LDS molecules increases the EQE from near zero to, at most, 40%. The increase in EQE corresponds to a rise in short-circuit current density of 0Á37 W 0Á13 mA/cm 2 under the AM1-5g spectrum.

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“…Here the configuration is quite different since the light converter is placed on the rear face of the solar cell, the used formalism, very close to that proposed in [23], is developed in Appendix A. The calculation of the short circuit current generated by upconverted emission was performed in a first step using equations (A.1−A.9) and, in a second step, using equations (A.10−A.13) which include internal reflections in the upconverter.…”

Section: Modelling the Experimental Resultsmentioning

confidence: 85%

“…A first model has been proposed by Byung-Chul Hong and Katsuyayasu Kawano, concerning the short circuit current generated by KMgF 3 :Sm layer placed at a top of a CdS/CdTe solar cell [23]. Here the configuration is quite different since the light converter is placed on the rear face of the solar cell, the used formalism, very close to that proposed in [23], is developed in Appendix A.…”

Section: Modelling the Experimental Resultsmentioning

confidence: 99%

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Upconversion of 1.54μm radiation in Er³⁺doped fluoride-based materials for c-Si solar cell with improved efficiency

2011

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Upconverted emission from erbium ions in fluoride materials (glass and disordered crystal of the system CaF2-YF3) are observed in a wide spectral range (from the visible to the near infrared) under infrared excitation at 1.54 μm. In both cases, the upconverted emission in the near infrared (∼1 μm) dominates the spectrum. Absolute UC efficiency defined as the ratio between the UC luminescence power and the absorbed pump power has been experimentally measured. The NIR (∼1 μm) luminescence energy yield for the glass and the disordered crystal varies from 2.4 to 11.5% for the glass and from 7.7 to 16% for the crystal for an infrared excitation power density ranging from 2 W/cm 2 to 100 W/cm 2 . This is of a particular interest for their use as upconverter to improve the c-Si cells quantum efficiency since the energy of the excitation lies below the c-Si absorption edge (1.12 eV at 300 K) and is well located compared to the AM1.5G solar spectrum, outside of the absorption lines due to different atmospheric gases. Furthermore, the most efficient upconverted emission recorded in the investigated materials occurs at an energy just above the gap. A current generated in a bifacial c-Si solar cell is observed when the Er 3+ doped material (1.55 mA and 2.15 mA for the glass and the crystal respectively), placed at the rear face of the cell, is excited at 1.54 μm. The current dependence as a function of the sub-bandgap excitation power has been measured and modelled. Finally the EQE of the complete device is deduced from the measured shortcircuit current and the incident photon flux on the cell. An increase of the cell quantum efficiency of 2.4% and 1.7% is obtained at 1.54 μm with adding the glass and the crystal respectively at the rear face of the c-Si cell. The results are compared to those already obtained with Er: NaYF4 known as the most efficient upconverter. IntrodutionResearches on sustainable energy sources underwent a strong impulse these last years. Among different opportunities, solar energy offers the most abundant sustainable source but, up to now, its use still remains low compared to other sustainable energy sources such as hydraulic, biomass, wind. The main hindrance to a wide development of solar energy has several causes such as the cost of the kWh produced (20−40 cts/kWh), that is in part limited by the efficiency of commercially available solar cells (5−20%) [1]. Important technological breakthroughs only will allow overcoming these difficulties and investigations in this field are directed toward researches on third generation solar cells. Hot carriers, solar concentrators, nanostructured silicon, tandem cells represent the most popular orientations to achieve third generation solar cells. a e-mail: fabienne-pelle@chimie-paristech.frIn these cases, predicted efficiency is drastically improved and may lead to devices with a much higher cost. In this frame, a possibility based on down-(photon cutting) and up-conversion (photon addition) has been proposed. The efficiency increase is provided by a...

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PL and PLE studies of KMgF3:Sm crystal and the effect of its wavelength conversion on CdS/CdTe solar cell

Cited by 66 publications

References 20 publications

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Increase in external quantum efficiency of encapsulated silicon solar cells from a luminescent down‐shifting layer

Upconversion of 1.54μm radiation in Er³⁺doped fluoride-based materials for c-Si solar cell with improved efficiency

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PL and PLE studies of KMgF3:Sm crystal and the effect of its wavelength conversion on CdS/CdTe solar cell

Cited by 66 publications

References 20 publications

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Modeling of downconverter based on Pr3+-Yb3+ codoped fluoride glasses to improve sc-Si solar cells efficiency

Increase in external quantum efficiency of encapsulated silicon solar cells from a luminescent down‐shifting layer

Upconversion of 1.54μm radiation in Er3+doped fluoride-based materials for c-Si solar cell with improved efficiency

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Upconversion of 1.54μm radiation in Er³⁺doped fluoride-based materials for c-Si solar cell with improved efficiency