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  • 1.
    Adsten, M
    et al.
    Univ Uppsala, Angstrom Lab, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Joerger, R
    Univ Uppsala, Angstrom Lab, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Järrendahl, Kenneth
    Linköping University, The Institute of Technology.
    Wackelgard, E
    Univ Uppsala, Angstrom Lab, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Optical characterization of industrially sputtered nickel-nickel oxide solar selective surface2000In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 68, no 4, p. 325-328Article in journal (Refereed)
    Abstract [en]

    Tandem absorbers are often used in the design of solar absorbers for photo thermal conversion. They consist of a thin coating, selectively absorbing in the wavelength range of the solar spectrum, on a metal substrate. The optical performance of a tandem absorber depends on the optical constants and thickness of the absorbing coating and also on the reflectivity of the underlying metal. A very high solar absorptance is achieved when the coating has a non-uniform composition in the sense that the refractive index is highest closest to the metal substrate and then gradually decreases towards the front surface. This type of composition suppresses coating interference and gives a low front surface reflection if the refractive index at the front surface is low. We report on optical analysis of a, Solar absorber with a graded index coating of sputtered nickel-nickel oxide deposited on aluminium. The optical constants have been determined from reflectance, transmittance and ellipsometry data by fitting the data to a two-layer model of the coating. The optical constants of the two layers can be regarded as effective optical constants for the lower and upper part of the graded index coating respectively. It is found that the effective refractive index of the top layer is somewhat tower than for the base layer. The extinction coefficient is higher in the lower part of the coating. Both effective refractive index and extinction coefficient of the base layer increase monotonically with increasing wavelength as for metallic materials. (C) 2000 Elsevier Science Ltd. All rights reserved.

  • 2.
    Andersson, Viktor
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Wuerfel, Uli
    Fraunhofer Institute Solar Energy Syst.
    Inganäs, Olle
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
    Full day modelling of V-shaped organic solar cell2011In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 85, no 6, p. 1257-1263Article in journal (Refereed)
    Abstract [en]

    Folded and planar solar cells are examined with optical simulations, with the finite element method. The maximum photocurrent densities during the full day are compared between cells of different geometries and tilting angles. The change of incident angle and spectrum over time are handled in this analysis. The results show that the light trapping effect of the folded cell makes these cells show higher maximum photocurrent densities than the planar cells during all hours of the day. This is the case for both single and tandem cells. The results also indicate that balancing the currents in the tandem cells by adjusting the active layer thickness may be more cumbersome with the folded tandem cells than the stacked planar cells.

  • 3.
    Vicente, Antonio T.
    et al.
    University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    Wojcik, Pawel
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    Mendes, Manuel J.
    University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    Aguas, Hugo
    University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    Fortunato, Elvira
    University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    Martins, Rodrigo
    University of Nova Lisboa, Portugal; CEMOP UNINOVA, Portugal.
    A statistics modeling approach for the optimization of thin film photovoltaic devices2017In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 144, p. 232-243Article in journal (Refereed)
    Abstract [en]

    The growing interest in exploring thin film technologies to produce low cost devices such as n-i-p silicon solar cells, with outstanding performances and capability to address the highly relevant energy market, turns the optimization of their fabrication process a key area of development. The usual one-dimensional analysis of the involved parameters makes it difficult and time consuming to find the optimal set of conditions. To overcome these difficulties, the combination of experimental design and statistical analysis provides the tools to explore in a multidimensional fashion the interactions between fabrication parameters and expected experimental outputs. Design of Experiment and Multivariate Analysis are demonstrated here for the optimization of: (1) the low temperature deposition (150 degrees C) of high quality intrinsic amorphous silicon (i-a-Si:H); and (2) the matching of the n-, i-, and p-silicon layers thickness to maximize the efficiency of thin film solar cells. The multiple regression method applied, validated through analysis of variance and evaluated against exact numerical simulations, is shown to predict the overall intrinsic layer properties and the devices performance. The results confirm that experimental design and statistical data analysis are effective approaches to improve, within a minimum time frame and high certainty, the properties of silicon thin films, and subsequently the layer structure of solar cells.(C) 2017 Published by Elsevier Ltd.

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