Electrical and Mechanical Properties of Plated Ni/Cu Contacts for Si Solar Cells
Synthesis and Characterization of N-alkyl-N′-glucosylhexanediamine Surfactant
Published in Tenside Surfactants Detergents
The synthesis and structural analysis of glucosamide surfactants of the general formula CnH2n+1NH(CH2)6NHCO(CHOH)4CH2OH (n = 8, 10, 12) were described, and the surface activity properties of the surfactants were studied, and the interfacial tensions between n-octane and the aqueous surfactant solution were measured. N-alkylhexanediamines were synth...
Verfestigungs- und Schädigungsverhalten von Blechwerkstoffen im ebenen Torsionsversuch
The in-plane torsion test is a sheet metal test method for the characterization of plastic behavior under shear loadings. This test has the ability to achieve high strains for the flow curve determination. Furthermore, the specimen is loaded without unwanted edge effects, which is another advantage of this test. However, the in-plane torsion test i...
Surface recombination parameters of interdigitated-back-contact silicon solar cells obtained by modeling luminescence im...
Current losses at surfaces play a crucial role in the optimization of high-efficiency silicon solar cells. We present a new approach to characterize the surface recombination activity of interdigitated-back-contact (IBC) silicon solar cells by comparing experimental and simulated photoluminescence images (PL). The different recombination properties...
Nanoscale Investigation of the Interface Situation of Plated Nickel and Thermally Formed Nickel Silicide for Silicon Sol...
In the context of nickel silicide formation from plated nickel layers for solar cell metallization, there are several open questions regarding contact adhesion and electrical properties. Nanoscale characterization by transmission electron microscopy has been employed to support these investigations. Interfacial oxides and silicide phases were inves...
Solar cell efficiency losses due to impurities from the crucible in multicrystalline silicon
The electrical material quality of multicrystalline (mc) silicon for photovoltaic applications suffers from crystal defects as well as from impurities that originate from the feedstock, the quartz crucible, and its coating. In this study, we investigate the influence of impurities from the crucible on efficiency losses in mc silicon solar cells, fo...
Investigation of Salicide Process from Sputtered Nickel on Structured SiNx ARC for Mono-Crystalline Si Solar Cells
Short-circuit current density mapping for solar cells
A map of local short-circuit current density (JSC) of a solar cell at standard irradiance spectra is a desirable source of information for current-loss analysis and device optimization. In this work, we present a new and easily implementable method to obtain such JSC maps as well as local external quantum efficiency graphs with a spatial resolution...
Entscheidungskriterium für Luftkollektoren zur BAFA-Förderung
Efficiency-limiting recombination in multicrystalline silicon solar cells
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This work presents recent advances in the characterisation of carrier recombination and impurities at Fraunhofer ISE. The role of iron contamination during crystallisation is analysed in more detail. Numerical simulations and comparisons to experimental data are presented which demonstrate the impact of iron from the crucible and crucible coating a...
