Highly transmissive luminescent down-shifting layers filled with phosphor particles for photovoltaics

Solodovnyk, Anastasiia; Forberich, Karen; Stern, Edda; Krč, Janez; Topič, Marko; Batentschuk, Miroslaw; Lipovšek, Benjamin; Brabec, Christoph J.

doi:10.1364/ome.5.001296

Cited by 20 publications

(12 citation statements)

References 22 publications

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“…For the purpose of k determination, thick layers with phosphor particles were prepared as described elsewhere [16]. As a transparent binder we used QSil 218 (Batch Nr.…”

Section: Experimental Procedures Related To K Determinationmentioning

confidence: 99%

“…As a transparent binder we used QSil 218 (Batch Nr. #130824, ACC Silicones Ltd., UK) two-part (A + B) addition cure silicone elastomer with n = 1.457 at λ = 600 nm [16]. Particle volume concentration in the dried layers was kept to 6 vol.…”

Section: Experimental Procedures Related To K Determinationmentioning

confidence: 99%

“…We demonstrated that the properties of phosphor particles (complex refractive index, particles size distribution, PL characteristics), including irregular non-spherical geometry, as well as the properties of complete layers (thickness, particle volume concentration, multiple scattering and re-absorption events) are all accurately taken into account by the model. Please see [16] for further details about the implementation of the optical model, including the complete list of input parameters.…”

Section: Step 2 Determination Of the Extinction Coefficient K And mentioning

confidence: 99%

“…The thickness of the particle-filled layers was measured with an error of ± 5-8 µm, so the particle volume concentration has deviations of less than 0.5%. The (complex) refractive indices of all the supporting materials (polymer binder, glass substrate) were determined earlier [16]. Another input parameter is n, which was measured in the first step, and the particle size distribution.…”

Section: Step 2 Determination Of the Extinction Coefficient K And mentioning

confidence: 99%

“…Indeed, complex refractive index (n -ik) [3] of phosphor particles and its wavelength dependency is essential for any accurate simulation of phosphor-filled optical systems: LEDs [4][5][6][7][8][9][10], screens [11,12], light conversion layers for medical [13], biological [14] and solar energy applications [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Determination of the complex refractive index of powder phosphors

Solodovnyk¹,

Riedel²,

Lipovšek³

et al. 2017

Opt. Mater. Express

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Abstract:We demonstrate a novel 2-step method to precisely determine both n and k of phosphors, luminescent inorganic particles, in the visible spectrum. To measure n we modified the Becke Line immersion method and verified its applicability in the absorption/ emission regions of phosphor particles (step 1). Particles were then embedded into a transparent binder and coated in thick layers (100-500 µm) on glass. Absorptance of the layers was measured with a novel approach: spectral angular resolved measurements. This method delivers accurate results by avoiding any errors from intense scattering inside the layers. A computational model was employed to extract k of particles from the measured absorptance data taking into account luminescence, scattering and re-absorption (step 2). The entire method was verified on reference materials. Finally, based on the proposed method, we determined in a broad wavelength range the n and k parameters for a variety of commonly used phosphors with few or no earlier reports on their n and k values (the complete set of numerical data is fully disclosed in the supplementary materials). 10. S. Pimputkar, J. S. Speck, S. P. DenBaars, and S. Nakamura, "Prospects for LED lighting," Nat. Photonics 3(4), 180-182 (2009 4502-4514 (2006). 13. J.-P. Moy, "Recent developments in X-ray imaging detectors," Nucl. Instrum. Methods Phys. Res. 442(1-3), 26-37 (2000). 14. L. Wondraczek, M. Batentschuk, M. A. Schmidt, R. Borchardt, S. Scheiner, B. Seemann, P. Schweizer, and C. J.Brabec, "Solar spectral conversion for improving the photosynthetic activity in algae reactors," Nat. Commun. 4, 2047Commun. 4, (2013 based on a demonstrated cross-relaxation process," Sci. Rep. 6(1), 22545 (2016).

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“…For the purpose of k determination, thick layers with phosphor particles were prepared as described elsewhere [16]. As a transparent binder we used QSil 218 (Batch Nr.…”

Section: Experimental Procedures Related To K Determinationmentioning

confidence: 99%

Section: Experimental Procedures Related To K Determinationmentioning

confidence: 99%

Section: Step 2 Determination Of the Extinction Coefficient K And mentioning

confidence: 99%

Section: Step 2 Determination Of the Extinction Coefficient K And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of the complex refractive index of powder phosphors

Solodovnyk¹,

Riedel²,

Lipovšek³

et al. 2017

Opt. Mater. Express

Self Cite

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Guideline for Efficiency Enhancement in Semi‐Transparent Thin‐Film Organic Photovoltaics with Dielectric Mirrors

Bronnbauer

Gasparini

Brabec

et al. 2016

Advanced Optical Materials

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Semi‐transparent organic solar cells (ST‐OSCs) show a unique potential to be integrated in windows due to their outstanding characteristics such as high transparency and color‐adjustability. In order to achieve both, high transparency and high efficiency, the use of dielectric mirrors is an excellent concept. However, such a mirror will not only improve the photocurrent generated by a solar cell but also cause losses in transparency. In this work, a theoretical model is developed that predicts the effect of the dielectric mirror on the balance between photocurrent enhancement and transparency loss depending on the spectral shape of the ST‐OSC absorption. Experimental investigations with three fully printed ST‐OSCs showing different absorption characteristics underline the validity of these studies. It is concluded that ST‐OSCs with broad absorption spectra ranging from the short wavelength region over the visible to at least 950 nm are most suitable for the implementation of a dielectric mirror. A narrower absorption spectrum or a shift of the spectrum toward longer wavelengths makes an increase in photoactive layer thickness more beneficial than the attachment of a dielectric mirror. Moreover, the dielectric mirror approach is an excellent strategy to obtain high photocurrents for materials which cannot be processed at high active layer thicknesses.

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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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Highly transmissive luminescent down-shifting layers filled with phosphor particles for photovoltaics

Cited by 20 publications

References 22 publications

Determination of the complex refractive index of powder phosphors

Determination of the complex refractive index of powder phosphors

Guideline for Efficiency Enhancement in Semi‐Transparent Thin‐Film Organic Photovoltaics with Dielectric Mirrors

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

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