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Ichtershausen, Germany

A method for mounting photovoltaic modules includes calculating a structural load of at least one photovoltaic module based on an expected mechanical load so as to determine optimal attachment locations on the at least one photovoltaic module for attachment elements. The attachment elements are disposed at the determined attachment locations so that the attachment elements extend partially over a section of the at least one photovoltaic module. The at least one photovoltaic module is attached to the substructure via the attachment elements.

Melkonyan H.,Masdar Institute of Science and Technology | Saylan S.,Masdar Institute of Science and Technology | Heidelberg A.,Masdar PV GmbH | Bloess H.,Masdar PV GmbH | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering

Surface texturing in thin-film solar cells provides a promising way of addressing the loss components due to reflection and poor light absorption inside the cells. In this work, we study the reflection suppression performance of different submicron-scale periodic surface texturing morphologies through two dimensional (2D) finite-difference time-domain (FDTD) computations. The broadband reflection response is investigated at two interfaces, air/glass and glass/TCO (transparent conductive oxide), for a spectral range of 300-2500 nm. A Drude-Lorentz model is used to account for material dispersion and absorption within the wavelengths of interest. In order to optimize the light trapping performance, numerical simulations of various surface texture structures are compared with those of flat interfaces. Numerical results show a reduction in reflection at the air/glass interface to values below 0.2% for some of the triangular gratings, compared to up to 4% for the non-textured interface. For the glass/TCO interface, reflection decreases to less than half when compared to the non-textured interface, also for triangular gratings. Further structures that replicate perfect multi-layer anti-reflection coatings are also studied. These structures are tuned to cancel specific wavelengths and can create an arbitrary effective index, overcoming the constraint of the limited number of refractive index values available. The best structures obtained for the air/glass and glass/TCO interfaces are combined in one stack, achieving reflectance values at least one order of magnitude below the non-textured air/glass/TCO stack. © 2013 SPIE. Source

A method of installing a photovoltaic module includes providing a stationary substructure configured as a supporting and affixing structure and affixing the photovoltaic module to the substructure with an adhesive bond. A photovoltaic array includes a stationary substructure configured as a supporting and affixing structure and at least one photovoltaic module affixed to the substructure by an adhesive bond.

Gabriel O.,Helmholtz Center Berlin | Frijnts T.,Masdar PV GmbH | Calnan S.,Helmholtz Center Berlin | Ring S.,Helmholtz Center Berlin | And 15 more authors.
IEEE Journal of Photovoltaics

Liquid-phase crystallized silicon absorber layers have been applied in heterojunction solar cells on glass substrates with 10.8% conversion efficiency and an open-circuit voltage of 600 mV. Intermediate layers of SiOx, SiNx , and SiOxNy, as well as the a-Si:H precursor layer, were deposited on 30 cm × 30 cm glass substrates using industrial-type plasma-enhanced chemical vapor deposition equipment. After crystallization on 3 cm × 5 cm area using a continuous-wave infrared laser line, the resulting polysilicon material showed high material quality with large grain sizes. © 2014 IEEE. Source

Gabriel O.,Helmholtz Center Berlin | Kirner S.,Helmholtz Center Berlin | Leendertz C.,Helmholtz Center Berlin | Gerhardt M.,Masdar PV GmbH | And 4 more authors.
Physica Status Solidi (C) Current Topics in Solid State Physics

We report on recent developments of a-Si:H/a-Si:H based thin film solar cells on Gen8.5 module area. The initial efficiency of 5.7 m2 modules and 1.4 m2 sub-modules has been increased from 5% to 8% using standard floatline, low-cost glass substrates coated with SnO2:F front TCO. The improvements based on optimizations of the n1/p2 tunnel recombination junction and of the p/i interfaces. The device simulation software AFORS-HET has been extended with an improved model for the n/p junction to describe measured module properties. Model input parameters are taken from measured properties of single thin films. The presented progress indicates the high potential of thin-film silicon based solar cells produced on large area. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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