External quantum efficiency analysis of Si solar cells with II-VI nanocrystal luminescent down-shifting layers

Rothemund, Ralph; Kreuzer, Susanne; Umundum, Thomas; Meinhardt, G.; Fromherz, T.; Jantsch, W.

doi:10.1016/j.egypro.2011.10.157

Cited by 32 publications

(14 citation statements)

References 4 publications

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“…There are two main parameters that affect the EQE of the solar module, including the down-shifting layers on the front surface of the device: one is luminescence down-shifting efficiency, and the other is the absorbance scaling factor [26]. The absorbance scaling factor of the ZnSe QDs thin film is directly influenced by the transmittance related to the thickness and morphology (e.g., roughness, porosity).…”

Section: Resultsmentioning

confidence: 99%

Improved efficiency of ZnSe QDs—Si hybrid solar cell system by down shifting process

et al. 2014

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Traditional Si solar cells have a narrow active absorption cross section among the short wavelength range (200-400 nm). The down-shifting process can efficiently improve the spectral response of Si solar cells by converting shorter wavelengths (i.e., ultraviolet, UV) to longer wavelengths (i.e., the visible range). Here, ZnSe quantum dots (QDs), prepared by an aqueous solution method and employed as a luminescent down-shifting layer, were spin coated onto the upper surface of manufactured Si solar cells. Measurements under standard test conditions (AM1.5, 100 mW/cm 2 ) show that the efficiency of the ZnSe QDs-Si hybrid solar cell is increased from 11.48% to12%. The improvement of the ZnSe QDs-Si hybrid solar cell is ascribed to the efficient down-shifting process of ZnSe QDs, which enhances spectra response in the UV region for Si solar cells. The mechanism of this optical coupling and efficiency enhancement is investigated in detail. These results support the case that low-cost ZnSe QDs can be employed as efficient downshifting material on large-area solar cells.PACS Nos.: 81.07Ta, 77.84Bw, 88.40hj. Résumé : Les cellules solaires Si traditionnelles ont une section efficace d'absorption faible dans le domaine des ondes courtes (200-400 nm). Un mécanisme de décalage vers le bas (downshifting) peut améliorer l'efficacité des cellules solaires Si en convertissant les courtes longueurs d'onde (ultraviolet, UV) vers les longueurs d'onde du visible. Nous employons ici des points quantiques (QD) deZnSe, préparés en solution aqueuse, comme couche de convertisseur vers le bas et les appliquons par enduction centrifuge sur la surface de la cellule solaire Si manufacturée. Des mesures faites sous des conditions standardisées (AM1.5, 100 mW/cm 2 ) montrent que l'efficacité de la cellule solaire hybride ZnSe QD-Si voit son efficacité passer de 11.48% à 12%. Nous attribuons l'amélioration du cas hybride ZnSe QD-Si à une conversion efficace par les QD de ZnSe, qui augmente la réponse spectrale de la cellule Si dans l'UV. Nous étudions ici en détail le mécanisme de ce couplage optique et l'amélioration qu'il apporte. Ces résultats supportent l'utilisation des QD ZnSe peu chers comme convertisseurs efficaces pour les cellules solaires. [Traduit par Rédaction]

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Section: Resultsmentioning

confidence: 99%

Improved efficiency of ZnSe QDs—Si hybrid solar cell system by down shifting process

et al. 2014

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“…The aim of this analysis was to validate the experimental results obtained and to gain an insight into LDS processes. This particular model was chosen because it is simple to implement and it has shown an excellent agreement with simulated EQE and measured EQE spectra in a number of studies [5,8,18,19]. In this model, the incoming photon flux density was separated into two fractions, the absorbed fraction (Abs ) and the transmitted The number of photons absorbed by the LDS layer compared to the incoming photons flux can be calculated for each wavelength using the Lambert-Beer law as follows:…”

Section: Analyzing Eqe Spectra Using Rothemund Optical Modelmentioning

confidence: 99%

“…For an efficient LDS layer, absorbed photons must be reemitted at wavelengths where the EQE of the solar cell is high so they can be readily converted into electricity. Therefore, emission spectral matching (ESM), which is defined as the fraction of the emission that overlaps with the EQE [5,17], is used in the model to calculate LDS efficiency. ESM is given as follows:…”

Section: Analyzing Eqe Spectra Using Rothemund Optical Modelmentioning

confidence: 99%

“…Luminescent downshifting (LDS) is an optical approach to increase a solar cell's spectral response by using luminescent materials to convert high energy photons to lower energy before the interaction with the solar cells occurs [1][2][3][4][5][6][7]. The downshifted photons have wavelength which may better match the photosensitivity spectral response of the solar cell as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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External Quantum Efficiency Improvement with Luminescent Downshifting Layers: Experimental and Modelling

Ahmed

McCormack

Doran³

2016

International Journal of Spectroscopy

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Core-shell quantum dots CdSe/ZnS and lumogen yellow organic dye are characterized by their inclusion in luminescent downshifting (LDS) layers. Layers were deposited on top of crystalline silicon cell (c-Si), dye synthesized solar cell (DSSC), and cadmium telluride (CdTe) minimodules. External quantum efficiency measurements for the solar cell/LDS devices are discussed. Experimental results were compared with an optical model developed by Rothemund, 2014.

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“…In addition, ultraviolet light is few to be utilized in various solar cells, but it makes damage to the surface of the solar cells. At present, anti-reflective [5][6][7] and wavelength conversion [8][9][10][11][12] are two predominant solutions to solve the problem. However, technology of anti-reflective so mature that it has little promotion space, while the wavelength conversion layer exists the problem of low transmission [10].…”

Section: Introductionmentioning

confidence: 99%

Y2O3: Eu3+, Tb3+ spherical particles based anti-reflection and wavelength conversion bi-functional films: Synthesis and application to solar cells

Miao

et al. 2015

Journal of Alloys and Compounds

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External quantum efficiency analysis of Si solar cells with II-VI nanocrystal luminescent down-shifting layers

Cited by 32 publications

References 4 publications

Improved efficiency of ZnSe QDs—Si hybrid solar cell system by down shifting process

Improved efficiency of ZnSe QDs—Si hybrid solar cell system by down shifting process

External Quantum Efficiency Improvement with Luminescent Downshifting Layers: Experimental and Modelling

Y2O3: Eu3+, Tb3+ spherical particles based anti-reflection and wavelength conversion bi-functional films: Synthesis and application to solar cells

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