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Browsing by Subject "Crystalline materials"

Now showing items 1-20 of 36

Ag+, Fe3+ and Zn2+-intercalated cadmium(II)-metal-organic frameworks for enhanced daylight photocatalysis

Surib, Nur Atiqah; Sim, Lan Ching; Leong, Kah Hon; Kuila, Aneek; Saravanan, Pichiah; Lo, Kong Mun; Ibrahim, Shaliza; Bahnemann, Detlef W.; Jang, Min (Cambridge : Royal Society of Chemistry, 2017)

Design and synthesis of multi-dimensional metal-organic frameworks are fascinating because MOFs possess intriguing structures and unique properties and exhibit potential applications in photocatalysis. In the present study, ...
Analysis of local Al-doped back surface fields for high efficiency screen-printed solar cells

Gatz, Sebastian; Bothe, Karsten; Müller, Jens; Dullweber, Thorsten; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

In this paper, we investigate the surface recombination of local screen-printed aluminum contacts applied to rear passivated solar cells. We measure the surface recombination velocity by microwave-detected photoconductance ...
Atmospheric components and dopant carry-over influence during laser ablation

Schütz, Viktor; Haupt, Oliver; Stute, Uwe (London : Elsevier Ltd., 2011)

In order to improve the efficiency of multi-crystalline (mc)-silicon solar cells, laser ablation as a non-contact tool is highly suitable for various processes. Apart from the laser and scanning parameters frequently ...
Comparison of the thermal stability of single Al2O3 layers and Al2O3/SiNx stacks for the surface passiviation of silicon

Veith, Boris; Werner, Florian; Zielke, Dimitri; Brendel, Rolf; Schmidt, Jan (Amsterdam : Elsevier BV, 2011)

We measure surface recombination velocities (SRVs) below 10 cm/s on low-resistivity (1.4 Ωcm) p-type crystalline silicon wafers passivated with plasma-assisted and thermal atomic layer deposited (ALD) aluminium oxide (Al2O3) ...
Demonstrating the high Voc potential of PEDOT:PSS/c-Si heterojunctions on solar cells

Gogolin, Ralf; Zielke, D.; Descoeudres, A.; Despeisse, M.; Ballif, C.; Schmidt, J. (London : Elsevier Ltd., 2017)

In this study, we demonstrate the high surface passivation quality of PEDOT:PSS/c-Si junctions for the first time on solar cell level, reaching a record high Voc value of 688 mV after full-area metallization of the PEDOT:PSS. ...
Determination of the collection diffusion length by electroluminescence imaging

Schinke, Carsten; Hinken, David; Bothe, Karsten; Ulzhöfer, Christian; Milsted, Ashley; Schmidt, Jan; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

The electroluminescence emission of crystalline silicon solar cells at near-bandgap wavelengths is investigated. We show that the intensity of the emitted luminescence at near-bandgap wavelengths is directly proportional ...
Determination of the Contact Resistivity of Screen-printed Al Contacts Formed by Laser Contact Opening

Kranz, Christopher; Lim, Bianca; Baumann, Ulrike; Dullweber, Thorsten (London : Elsevier Ltd., 2015)

Next-generation industrial PERC solar cells typically include local laser contact opening (LCO) of a dielectric passivation layer stack at the rear side and subsequent full-area aluminum screen printing and firing. In this ...
Effective passivation of crystalline silicon surfaces by ultrathin atomic-layer-deposited TiOx layers

Titova, V.; Veith-Wolf, B.; Startsev, D.; Schmidt, J. (London : Elsevier Ltd., 2017)

We characterize the surface passivation properties of ultrathin titanium oxide (TiOx) films deposited by atomic layer deposition (ALD) on crystalline silicon by means of carrier lifetime measurements. We compare different ...
Experimental Determination of the Uncertainty of the Absorption Coefficient of Crystalline Silicon

Schinke, Carsten; Peest, Peter Christian; Bothe, Karsten; Schmidt, Jan; Brendel, Rolf; Vogt, Malte R.; Kröger, Ingo; Winter, Stefan; Schirmacher, Alfred; Lim, Siew; Nguyen, Hieu T.; MacDonald, Daniel (Amsterdam : Elsevier, 2015)

Based on a combined analysis of spectroscopic ellipsometry, reflectance and transmittance measurements as well as spectrally resolved luminescence measurements and spectral responsivity measurements, we present data of the ...
Formation of locally aluminum-doped p-type silicon regions by in-line high-rate evaporation

Mader, Christoph; Bock, Robert; Müller, Jens; Schmidt, Jan; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

Locally aluminum-doped p-type silicon regions are formed by in-line high-rate evaporation of aluminum. We deposit aluminum layers of 28 μm thickness at dynamic deposition rates of 20 μm×m/min on locally laser-ablated Al2O3 ...
Graphene-like metal-organic frameworks: Morphology control, optimization of thin film electrical conductivity and fast sensing applications

Hoppe, Bastian; Hindricks, Karen D.J.; Warwas, Dawid P.; Schulze, Hendrik A.; Mohmeyer, Alexander; Pinkvos, Tim J.; Zailskas, Saskia; Krey, Marc R.; Belke, Christopher; König, Sandra; Fröba, Michael; Haug, Rolf J.; Behrens, Peter (Cambridge : Royal Society of Chemistry, 2018)

The metal-organic framework Cu-2,3,6,7,10,11-hexahydroxytriphenylene (Cu3hhtp2-MOF), a copper-based graphene-like framework, is one of the few MOFs featuring inherent electrical conductivity. Here, we investigate the ...
Ground-state properties of few dipolar bosons in a quasi-one-dimensional harmonic trap

Deuretzbacher, Frank; Cremon, J.C.; Reimann, S.M. (College Park, MD : American Physical Society, 2010)

We study the ground state of few bosons with repulsive dipole-dipole interaction in a quasi-one-dimensional harmonic trap by means of the exact diagonalization method. Up to three interaction regimes are found, depending ...
High-rate atomic layer deposition of Al2O3 for the surface passivation of Si solar cells

Werner, Florian; Stals, Walter; Görtzen, Roger; Veith, Boris; Brendel, Rolf; Schmidt, Jan (Amsterdam : Elsevier BV, 2011)

High-rate spatial atomic layer deposition (ALD) enables an industrially relevant deposition of high-quality aluminum oxide (Al2O3) films for the surface passivation of silicon solar cells. We demonstrate a homogeneous ...
Impact of Ag Pads on the Series Resistance of PERC Solar Cells

Schulte-Huxel, Henning; Witteck, Robert; van Laak, Paula; Brendemühl, Till; Hinken, David; Bothe, Karsten; Brendel, Rolf (London : Elsevier Ltd., 2016)

Screen-printed passivated emitter and rear cells (PERC) require Ag pads on the rear side to enable solderable connections for module integration. These Ag pads are separated from the silicon by a dielectric layer to avoid ...
Increased Light Harvesting by Structured Cell Interconnection Ribbons: An Optical Ray Tracing Study Using a Realistic Daylight Model

Holst, Hendrik; Schulte-Huxel, Henning; Winter, Matthias; Blankemeyer, Susanne; Witteck, Robert; Vogt, Malte R.; Booz, Thomas; Distelrath, Fabian; Köntges, Marc; Bothe, Karsten; Brendel, Rolf (London : Elsevier Ltd., 2016)

A key for increasing the module efficiency is improved light harvesting. The structuring of solar cell interconnection ribbons (CIR) is a promising option for improved light harvesting as it can easily be integrated into ...
Kerfless exfoliated thin crystalline Si wafers with Al metallization layers for solar cells

Niepelt, Raphael; Hensen, Jan; Steckenreiter, Verena; Brendel, Rolf; Kajari-Schröder, Sarah (Cambridge : Cambridge University Press, 2015)

We report on a kerfless exfoliation approach to further reduce the costs of crystalline silicon photovoltaics making use of evaporated Al as a double functional layer. The Al serves as the stress inducing element to drive ...
Layer selective laser ablation for local contacts to thin emitters

Haase, Felix; Rojas, Enrique Garralaga; Bothe, Karsten; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

High efficiency solar cells require high generation and low recombination rates. High bulk lifetime, well passivated surfaces, and lowly doped thin emitters allow for low recombination rates. Thin passivated emitters should ...
Lifetime Analysis for Defect Characterization in Kerfless Epitaxial Silicon from the Porous Silicon Process

Gemmel, Catherin; Hensen, Jan; Kajari-Schröder, Sarah; Brendel, Rolf (London : Elsevier Ltd., 2016)

Kerfless epitaxial silicon from the porous silicon (PSI) process is a promising alternative for standard wafers. They allow the reduction of PV costs by combining high material quality at reduced production costs. We ...
Loss analysis and improvements of industrially fabricated Cz-Si solar cells by means of process and device simulations

Steingrube, S.; Wagner, Hannes; Hannebauer, Helge; Gatz, Sebastian; Chen, R.; Dunham, S.T.; Dullweber, Thorsten; Altermatt, Pietro P.; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

We model currently fabricated industrial-type screen-printed boron-doped Cz silicon solar cells using a combination of process and device simulations. The model reproduces the experimental results precisely and allows us ...
Optical Constants of UV Transparent EVA and the Impact on the PV Module Output Power under Realistic Irradiation

Vogt, Malte R.; Holst, Hendrik; Schulte-Huxel, Henning; Blankemeyer, Susanne; Witteck, Robert; Hinken, David; Winter, Matthias; Min, Byungsul; Schinke, Carsten; Ahrens, Ingo; Köntges, Marc; Bothe, Karsten; Brendel, Rolf (London : Elsevier Ltd., 2016)

We measure and discuss the complex refractive index of conventional ethylene vinyl acetate (EVA) and an EVA with enhanced UV-transmission based on spectroscopic ellipsometry, transmission and reflection measurements over ...

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