Florian Ruske

Scopus Publications

Early Onset Degradation Mechanism in All Solid-State Batteries Revealed by Operando Photoelectron Spectroscopy
Katherine A. Mazzio, Elmar Kataev, Francesco Piccolo, Florian Ruske, Raul Garcia-Diez, Regan Wilks, Marcus Bär, Philipp Adelhelm
ACS Energy Letters, 2026
High Resolution Image Download MS PowerPoint Slide Solid-state batteries (SSBs) promise enhanced safety and energy density, yet their long-term stability is limited by poorly understood interfacial degradation. Here, we perform operando hard X-ray photoelectron spectroscopy (HAXPES) on device-relevant structures, enabling depth-resolved probing of electrodes during cycling to follow lithiation and interfacial degradation processes in TiS 2 |Li 3 YCl 6 half cells. We identify a reduction process for Li 3 YCl 6 . Concurrently, oxygen-containing species are found to migrate toward the cathode current collector, where they react with TiS 2 to form an amorphous TiO x layer that contributes to capacity fade during extended cycling. Depth-dependent measurements confirm that oxygen enrichment is localized near the surface, establishing a kinetically driven degradation pathway linked to electron injection during discharge. These insights reveal how electrochemically induced migration of oxygen-containing species and interfacial redox can drive degradation in SSBs, providing a mechanistic basis for strategies to improve interfacial stability and cycling performance.
The effect of non-stoichiometry in Sb2Se3 films on their phonon and electronic properties in the infrared range
Bohdan Andriyevsky, Leszek Bychto, Aleksy Patryn, Takhir Razykov, Bobur Ergashev, Kudratulia Kouchkarov, Ramozan Khurramov, Diyorbek Isakov, Mukhammad Pirimmatov, Ulrich Schade, Florian Ruske, Alexander Steigert, Rene Schwiddessen, Ljiljana Puskar, Alexander Veber, Andrii I. Kashuba, Michał Piasecki
Scientific Reports, 2025
Due to the noticeable part of Sb 2 Se 3 films in solar cell technology, the deposition of Sb 2 Se 3 films with the desirable content and improved crystalline perfection is of crucial importance. Therefore, extensive experimental and theoretical studies of the electronic and phonon properties of these materials are of interest. In this work, the stoichiometry and morphology of antimony selenide films are correlated to their optical properties in the far-infrared regime and compared to theoretically calculated properties for an ideal crystal. For this study, the reflectance of a series of 1.4–1.7 μm thick Sb x Se y layers, produced on soda-lime glass substrates by molecular beam chemical deposition, was measured in the spectral range of 25–5000 cm⁻¹ using an FT-IR spectrometer and synchrotron radiation. The near-surface and bulk crystallographic structure and phase composition were previously determined using grazing incidence X-ray diffraction (GIXRD) under varying incident angles. The chemical composition and morphology were investigated using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). It was shown that the spectral positions of numerous maxima of the reflectance of Sb x Se y layers for various x/y indices in the phonon excitation range of 25–230 cm⁻¹ are consistent with the positions of the maxima of the imaginary part of the dielectric function of Sb 2 Se 3 crystals, calculated within the framework of density functional theory. A significant increase in the reflectance values was observed for Sb x Se y layers containing the largest relative amount of antimony x / y , which may be due to the increased content of the metallic form of antimony compared to the amount of the pure Sb 2 Se 3 semiconducting phase. A correlation was found between the technological parameters of production (temperature) and the final chemical composition and morphology of the Sb x Se y layers. To explain the observed relationships, calculations of the cohesive energy of Sb 2 Se 3 and Sb crystals and the binding energy of the residual antimony atom inside and on the surface of the antimony selenide supercell were performed. The main conclusions of the theoretical calculations are consistent with the results of EDX and XRD measurements of the Sb x Se y layers.
Ammonia tolerant alkaline oxygen reduction reaction on bimetallic cobalt spinels
Karuppasamy Dharmaraj, Rania Hanna, Florian Ruske, Danielle Douglas-Henry, Iver Lauermann, Sateesh Prathapani, Pablo Reyes-Figueroa, Yael Rodriguez-Ayllon, Yan Lu, Valeria Nicolosi, Rutger Schlatmann, Michelle P. Browne, Prashanth W. Menezes, Sonya Calnan
Chemical Engineering Journal, 2025
Ammonia, supported by its well-established transportation and distribution infrastructure, is considered as a promising carbon-free hydrogen carrier and emerging as an energy source via low-temperature anion exchange membrane direct ammonia fuel cells (AEM-DAFC). However, ammonia crossover from the anode can poison cathode catalysts, reducing oxygen reduction reaction (ORR) efficiency and cell voltage. Herein, to substitute the state-of-the-art catalyst, Pt/C, and to develop stable, ammonia-tolerant ORR catalysts, monometallic oxides of Co, Fe, Ni, Mn, and bimetallic M-CoO x (M = Fe, Ni, Mn) were synthesized on gas diffusion electrode (GDE) with microporous layer and tested for ORR activity. Among these, MnCoO x -1 (Mn:Co 1:2) demonstrated high NH 3 tolerance and ORR activity comparable to benchmark fuel cell catalyst, Pt/C under GDE conditions. In-situ Raman spectroscopy performed under GDE conditions revealed that the structure of MnCoO x -1 remains stable, with no detectable changes, even at current densities as high as −25 mA cm −2 . During the accelerated stress test conducted at 80 °C with 3.0 M NH 3 in 3.0 M KOH and compressed air at 1.0 bar back pressure feed, MnCoO x -1 showed an overpotential increase of less than 50 mV at −500 mA cm −2 in a 1.0 cm 2 membrane electrode assembly type GDE half-cell. Post-mortem X-ray analysis revealed a slight change in the relative atomic composition of MnCoO x -1 after the AST. This comprehensive study reveals that MnCoO x -1 is a stable NH 3 tolerant ORR catalyst, making it a promising cathode candidate for low temperature AEM-DAFC applications. Schematic illustration of the oxygen reduction reaction (ORR) in a gas diffusion electrode (GDE) environment. • Bimetallic Co based spinels are fabricated by facile electrodeposition route on gas diffusion electrode. • MnCoO x demonstrates promising oxygen reduction reaction activity, comparable to that of Pt/C. • In-situ Raman measurements confirm that the MnCoO x spinel structure is maintained at high current densities. • Excellent NH 3 tolerant ORR activity is observed at 80 °C, with only a 46 mV overpotential shift in the AST.
Tailored Crystallization Dynamics for Efficient and Stable DMSO-Free Tin Perovskite Solar Cells
Shengnan Zuo, Alexander Tarasov, Lennart Frohloff, Karunanantharajah Prashanthan, Florian Ruske, Mailis Lounasvuori, Chiara Frasca, André Dallmann, Fengshuo Zu, Florian Mathies, Florian Scheler, Noor Titan Putri Hartono, Guixiang Li, Jinzhao Li, Maxim Simmonds, Wenhui Li, Norbert Koch, Steve Albrecht, Meng Li, Eva Unger, Mahmoud Hussein Aldanmasy, Artem Musiienko, Antonio Abate
Advanced Science, 2025
Tin perovskite solar cells are emerging as a sustainable lead‐free alternative in thin film photovoltaics. DMSO‐free processed tin perovskites are gaining interest due to the detrimental effects of DMSO on tin oxidation. However, replacing DMSO with other solvents remains challenging due to the accelerated crystallization dynamics in non‐DMSO systems. In this study, the crystallization process in a DMSO‐free solvent system is regulated by managing the transition from the sol‐gel phase to the solid film. Specifically, piperazine dihydriodide (PDAI) and 4‐tert‐butylpyridine (tBP) are utilized to coordinately tune the colloidal chemistry through forming large pre‐nucleation clusters in perovskite ink, further, facilitating the film formation process. By combining tBP and PDAI, a controllable crystallization rate is achieved as evidenced by in situ photoluminescence (PL) measurement during spin‐coating. As a result, tin perovskite films show high crystallinity and improved microstructure. Devices treated with tBP+PDAI exhibit a champion power conversion efficiency of 7.8% and excellent stability without observable degradation for over 3000 h stored in the N2 glovebox. These findings advance understanding and managing crystallization in DMSO‐free solvents processed tin perovskite solar cells.
Phenothiazine-Based Self-Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells
Valerio Stacchini, Madineh Rastgoo, Mantas Marčinskas, Chiara Frasca, Kazuki Morita, Lennart Frohloff, Antonella Treglia, Thomas W. Gries, Orestis Karalis, Vytautas Getautis, Florian Ruske, Annamaria Petrozza, Norbert Koch, Hannes Hempel, Tadas Malinauskas, Antonio Abate, Artem Musiienko
Advanced Energy Materials, 2025
Self‐assembled monolayers (SAMs) have revolutionized the fabrication of lead‐based perovskite solar cells, but they still remain underexplored in tin perovskite systems. To date, PEDOT remains the most effective hole‐selective layer in tin perovskite solar cells (TPSCs), yet it presents challenges for both performance and stability. MeO‐2PACz, the only SAM reported for tin perovskites consistently underperforms when compared to PEDOT. In this work, it is identified that MeO‐2PACz's limitations stem from excessively strong interactions with the perovskite surface and poor lattice matching, which leads to inferior interface quality. To address these issues, a novel SAM‐forming molecule called Th‐2EPT is designed, synthesized, and characterized. Density functional theory (DFT) is used to evaluate coordination strength and lattice compatibility, complemented by electro‐optical characterisation techniques that show significantly reduced interfacial recombination and improve material crystallinity in Th‐2EPT/Perovskite films. With Th‐2EPT, the first SAM‐based tin perovskite solar cells that outperform PEDOT‐based devices, delivering a power conversion efficiency (PCE) of 8.2% with a DMSO‐free solvent system, are demonstrated.
In-situ temperature calibration for high temperature XRD experiments in vacuum demonstrated on pristine and Nb doped TiO2−x thin films
David Stock, G. A. Gruber, René Schwiddessen, Florian Ruske, Nikolaus Weinberger
Journal of Alloys and Compounds, 2025
We present an in-situ temperature calibration technique for high temperature grazing incident X-ray diffraction experiments conducted in high-vacuum. Thermal lattice extension of a crystalline platinum thin film is used to calibrate the temperature in the sample to the control-temperature measured by a thermocouple. This enables a precise thermal analysis of thin film crystal structures with an uncertainty of less than 10 K. Using this technique, we examine the crystallization behavior of pristine and niobium-doped titanium dioxide thin films, deposited by direct current magnetron sputtering from metal–ceramic composite targets. Crystallization onset temperatures and structural evolution were assessed for various target compositions and process conditions, revealing that increased metal content in the composite target tends to promote rutile phase formation during vacuum annealing. For the target containing 10 wt % niobium – identified as the most promising for a transparent conductive oxide application – an oxygen flow variation is evaluated. Results reveal significant differences in the crystal lattice depending on the oxygen flow during deposition. Introducing 0.2 % oxygen to the argon process gas is sufficient to induce the formation of pure anatase phase during heat treatment, yielding a minimum resistivity of 1.2 m Ω cm. Our findings highlight the crucial role of oxygen content in tailoring both the structural and opto-electrical properties of titanium dioxide based thin films, providing essential insights for the definition of optimal process windows. • In-situ temperature calibration achieves <10K uncertainty in high-vacuum XRD. • Metal–ceramic composite sputter targets used for titanium dioxide (TiO 2 ) thin films. • Nb-doped TiO 2 crystallization depends on metal content and oxygen flow. • Crystallization onset temperatures for various niobium percentage in TiO 2 thin films. • 0.2% O 2 in Ar gas induces pure anatase phase with 1.2 m Ω cm resistivity.
Texture-Enhanced Mechanical Stability of Transparent Electrodes for Flexible Optoelectronics with Near-Infrared Response
Simon Rieckhoff, Florian Riesebeck, Marcos Soldera, Katja Mayer‐Stillrich, Qiong Wang, Florian Ruske, Andrés Fabián Lasagni, Christiane Becker
Advanced Materials Interfaces, 2025
Transparent electrodes with high conductivity and mechanical robustness are essential for flexible opto‐electronic applications. Indium tin oxide (ITO) single layers have long been considered as unsuitable for flexible applications due to their brittleness. Here, it is shown that their mechanical stability can be substantially enhanced by texturing the flexible substrate. First, the opto‐electronic performance of single ITO layers and ITO/Ag/ITO stacks on polyethylene terephthalate (PET) foils is evaluated numerically by means of Haacke's figure‐of‐merit. Single ITO layers are found to be the electrode of choice for applications with a near‐infrared response due to their superior transparency. Following this, the sheet resistance of ITO layers is experimentally investigated on textured PET upon deformation parallel and perpendicular to a 1D texture grating. An “accordion‐like” deformation perpendicular to the grating and high texture aspect ratios are shown to avoid crack formation and loss of conductivity in the ITO. Simulations prove the considerably reduced occurrence of mechanical stress in this case. It is further experimentally demonstrated that texturing foils increase transmittance and haze. The enhanced mechanical robustness and optical performance by using textured foils make single ITO layers promising candidates for flexible opto‐electronic applications with a near‐infrared response, such as all‐perovskite tandem solar cells, thermal sensors, and photodetectors.
Description of excitonic absorption using the Sommerfeld enhancement factor and band-fluctuations
K Lizárraga, E Serquen, P Llontop, L A Enrique, M Piñeiro, E Perez, A Tejada, F Ruske, L Korte, J A Guerra
Journal of Physics D Applied Physics, 2025
One of the challenges of excitonic materials is the accurate determination of the exciton binding energy and bandgap from optical measurements. The difficulty arises from the overlap of the discrete and continuous excitonic absorption at the band edge. Many researches have modeled the shape of the absorption edge of such materials on the seminal formulation proposed by Elliott in 1957 (Phys. Rev. 108 1384–9) and its several modifications such as non-parabolic bands, magnetic potentials and electron–hole-polaron interactions. However, exciton binding energies obtained from optical absorption often vary strongly depending on the chosen ‘Elliott formula’. Here, we propose an alternative and rather simple approach, which has previously been successful in the determination of the optical bandgap of amorphous, direct and indirect semiconductors, based on the band-fluctuations (BFs) model. In this model, the fluctuations due to disorder, temperature or lattice vibrations give rise to the well known exponential shape of band tail states. The formulation results in an analytic equation for the fundamental absorption with 6 parameters only. To test it, the binding energy and optical bandgap of GaAs and the family of tri-halide perovskites ( MAPbX 3 ), X = Br , I , Cl , over a wide range of temperatures, are obtained by fitting the modified Elliott model. The results for the bandgap, linewidth and exciton binding energy are in good agreement with reports based on non-optical measurements. Moreover, due to the polar nature of perovskites, the retrieved binding energies can be compared with those computed with a model proposed by Kane (1978 Phys. Rev. B 18 6849). In the latter model, the exciton is surrounded by a cloud of virtual phonons interacting via the Frölich interaction. As a consequence, the upper bound for the binding energy of the exciton-polaron system can be estimated. These results are in good agreement with the optical parameters obtained with the proposed Elliott equation including BFs.
Seed Layers for Wide-Band Gap Coevaporated Perovskite Solar Cells: CsCl Regulates Band Gap and Reduces Process Variability
Viktor Škorjanc, Aleksandra Miaskiewicz, Marcel Roß, Suresh Maniyarasu, Stefanie Severin, Matthew R. Leyden, Philippe Holzhey, Florian Ruske, Lars Korte, Steve Albrecht
ACS Energy Letters, 2024
High Resolution Image Download MS PowerPoint Slide Coevaporation, an up-scalable deposition technique that allows for conformal coverage of textured industrial silicon bottom cells, is particularly suited for application in perovskite-silicon tandem solar cells (PSTs). However, research on coevaporated perovskites with an appropriate band gap for PSTs remains limited, with lower efficiency and reproducibility than solution-processed films. Here, we present a simple approach using a thin layer of a precursor material, namely, PbI 2, PbCl 2, CsI, or CsCl, as a seed layer on the hole-transporting layer/perovskite interface. We find CsCl to be the optimal seed layer for our system. Perovskite single junction cells prepared with CsCl seed layer exhibit 19.6% power conversion efficiency with a band gap of 1.69 eV and improved long-term stability. We attribute the observed enhancements to the more precise and consistent incorporation of the organic precursor into the perovskite lattice during the film growth. This work demonstrates that engineering the substrate surface is crucial for achieving well-controlled growth of efficient and stable coevaporated wide-band gap perovskite solar cells.
Transient grating spectroscopy on a DyCo5 thin film with femtosecond extreme ultraviolet pulses
Victor Ukleev, Ludmila Leroy, Riccardo Mincigrucci, Dario De Angelis, Danny Fainozzi, Nupur Ninad Khatu, Ettore Paltanin, Laura Foglia, Filippo Bencivenga, Chen Luo, Florian Ruske, Florin Radu, Cristian Svetina, Urs Staub
Structural Dynamics, 2024
Surface acoustic waves (SAWs) are excited by femtosecond extreme ultraviolet (EUV) transient gratings (TGs) in a room-temperature ferrimagnetic DyCo5 alloy. TGs are generated by crossing a pair of EUV pulses from a free electron laser with the wavelength of 20.8 nm matching the Co M-edge, resulting in a SAW wavelength of Λ = 44 nm. Using the pump-probe transient grating scheme in reflection geometry, the excited SAWs could be followed in the time range of −10 to 100 ps in the thin film. Coherent generation of TGs by ultrafast EUV pulses allows to excite SAW in any material and to investigate their couplings to other dynamics, such as spin waves and orbital dynamics. In contrast, we encountered challenges in detecting electronic and magnetic signals, potentially due to the dominance of the larger SAW signal and the weakened reflection signal from underlying layers. A potential solution for the latter challenge involves employing soft x-ray probes, albeit introducing additional complexities associated with the required grazing incidence geometry.
Development of direct current magnetron sputtered TiO2−x thin films as buffer layers for copper indium gallium diselenide based solar cells
David Stock, Nikolaus Weinberger, Florian Ruske, Leander Haug, Martina Harnisch, Roman Lackner
Thin Solid Films, 2023
Reducing sputter damage-induced recombination losses during deposition of the transparent front-electrode for monolithic perovskite/silicon tandem solar cells
Marlene Härtel, Bor Li, Silvia Mariotti, Philipp Wagner, Florian Ruske, Steve Albrecht, Bernd Szyszka
Solar Energy Materials and Solar Cells, 2023
Disentangling the effect of the hole-transporting layer, the bottom, and the top device on the fill factor in monolithic CIGSe-perovskite tandem solar cells by using spectroscopic and imaging tools
I Kafedjiska, G Farias Basulto, F Ruske, N Maticiuc, T Bertram, C A Kaufmann, R Schlatmann, I Lauermann
Jphys Energy, 2023
Slot-Die Coated Triple-Halide Perovskites for Efficient and Scalable Perovskite/Silicon Tandem Solar Cells
Ke Xu, Amran Al-Ashouri, Zih-Wei Peng, Eike Köhnen, Hannes Hempel, Fatima Akhundova, Jose A. Marquez, Philipp Tockhorn, Oleksandra Shargaieva, Florian Ruske, Jiahuan Zhang, Janardan Dagar, Bernd Stannowski, Thomas Unold, Daniel Abou-Ras, Eva Unger, Lars Korte, Steve Albrecht
ACS Energy Letters, 2022
Optimization of Silicon Heterojunction Interface Passivation on p- and n-Type Wafers Using Optical Emission Spectroscopy
Engin Özkol, Philipp Wagner, Florian Ruske, Bernd Stannowski, Lars Korte
Physica Status Solidi A Applications and Materials Science, 2022
Optoelectrical analysis of TCO+Silicon oxide double layers at the front and rear side of silicon heterojunction solar cells
Alexandros Cruz, Darja Erfurt, Philipp Wagner, Anna B. Morales-Vilches, Florian Ruske, Rutger Schlatmann, Bernd Stannowski
Solar Energy Materials and Solar Cells, 2022
Hybrid Perovskite Degradation from an Optical Perspective: A Spectroscopic Ellipsometry Study from the Deep Ultraviolet to the Middle Infrared
Alvaro Tejada, Sven Peters, Amran Al‐Ashouri, Silver Hamill Turren‐Cruz, Antonio Abate, Steve Albrecht, Florian Ruske, Bernd Rech, Jorge Andrés Guerra, Lars Korte
Advanced Optical Materials, 2022
Elucidating the effect of the different buffer layers on the thermal stability of CIGSe solar cells
Hasan A. Yetkin, Tim Kodalle, Tobias Bertram, Alejandra Villanueva Tovar, Reiner Klenk, Marin Rusu, Josefa Ibaceta-Jana, Florian Ruske, Ibrahim Simsek, Ruslan Muydinov, Bernd Szyszka, Rutger Schlatmann, Christian A. Kaufmann
IEEE Journal of Photovoltaics, 2021
Energy-level alignment tuning at tetracene/c-Si interfaces
Jens Niederhausen, Rowan W. MacQueen, Engin Özkol, Clemens Gersmann, Moritz H. Futscher, Martin Liebhaber, Dennis Friedrich, Mario Borgwardt, Katherine A. Mazzio, Patrick Amsalem, Minh Hai Nguyen, Benjamin Daiber, Mathias Mews, Jörg Rappich, Florian Ruske, Rainer Eichberger, Bruno Ehrler, Klaus Lips
Journal of Physical Chemistry C, 2020
Influence of Silicon Layers on the Growth of ITO and AZO in Silicon Heterojunction Solar Cells
Alexandros Cruz, Florian Ruske, Alberto Eljarrat, Pawel P. Michalowski, Anna B. Morales-Vilches, Sebastian Neubert, Er-Chien Wang, Christoph T. Koch, Bernd Szyszka, Rutger Schlatmann, Bernd Stannowski
IEEE Journal of Photovoltaics, 2020
Advantageous light management in Cu(In,Ga)Se2 superstrate solar cells
M.D. Heinemann, F. Ruske, D. Greiner, A.R. Jeong, M. Rusu, B. Rech, R. Schlatmann, C.A. Kaufmann
Solar Energy Materials and Solar Cells, 2016
High mobility In2O3:H as contact layer for a-Si:H/c-Si heterojunction and μc-Si:H thin film solar cells
H. Scherg-Kurmes, S. Körner, S. Ring, M. Klaus, L. Korte, F. Ruske, R. Schlatmann, B. Rech, B. Szyszka
Thin Solid Films, 2015
Water-assisted nitrogen mediated crystallisation of ZnO films
R. Muydinov, A. Steigert, S. Schönau, F. Ruske, R. Kraehnert, B. Eckhardt, I. Lauermann, B. Szyszka
Thin Solid Films, 2015
Combination of nitrogen mediated crystallisation with post-deposition annealing - Towards ultra-thin ZnO:Al contacts
R. Muydinov, F. Ruske, S. Neubert, A. Steigert, M. Klaus, S. Selve, G. Köppel, B. Szyszka
Thin Solid Films, 2015
Light trapping for a-Si: H/μc-Si: H tandem solar cells using direct pulsed laser interference texturing
Sven Ring, Sebastian Neubert, Christof Schultz, Sebastian S. Schmidt, Florian Ruske, Bernd Stannowski, Frank Fink, Rutger Schlatmann
Physica Status Solidi Rapid Research Letters, 2015
Improved conversion efficiency of a-Si:H/μc-Si:H thin-film solar cells by using annealed Al-doped zinc oxide as front electrode material
Sebastian Neubert, Mark Wimmer, Florian Ruske, Sonya Calnan, Onno Gabriel, Bernd Stannowski, Rutger Schlatmann, Bernd Rech
Progress in Photovoltaics Research and Applications, 2014
The complex interface chemistry of thin-film silicon/zinc oxide solar cell structures
D. Gerlach, M. Wimmer, R. G. Wilks, R. Félix, F. Kronast, F. Ruske, M. Bär
Physical Chemistry Chemical Physics, 2014
Annealing related changes in near-edge absorption and structural properties of Al-doped ZnO thin films
S. Schönau, F. Ruske, S. Neubert, B. Rech
Physica Status Solidi C Current Topics in Solid State Physics, 2014
Crack formation and Zn diffusion in high-temperature processed poly-Si/ZnO:Al stacks
Carolin Zachäus, Christiane Becker, Florian Ruske, Bernd Rech
Thin Solid Films, 2014
Solution-Processed Crystalline Silicon Thin-Film Solar Cells
Tobias Sontheimer, Daniel Amkreutz, Katharina Schulz, Paul H. Wöbkenberg, Christian Guenther, Vadym Bakumov, Joachim Erz, Christoph Mader, Stephan Traut, Florian Ruske, Moshe Weizman, Alexander Schnegg, Matthias Patz, Martin Trocha, Odo Wunnicke, Bernd Rech
Advanced Materials Interfaces, 2014
Conversion efficiency and process stability improvement of electron beam crystallized thin film silicon solar cells on glass
D. Amkreutz, J. Haschke, T. Häring, F. Ruske, B. Rech
Solar Energy Materials and Solar Cells, 2014
Damp heat stable doped zinc oxide films
J. Hüpkes, J.I. Owen, M. Wimmer, F. Ruske, D. Greiner, R. Klenk, U. Zastrow, J. Hotovy
Thin Solid Films, 2014
Potential of high-mobility sputtered zinc oxide as front contact for high efficiency thin film silicon solar cells
B. Stannowski, F. Ruske, S. Neubert, S. Schönau, S. Ring, S. Calnan, M. Wimmer, O. Gabriel, B. Szyszka, B. Rech, R. Schlatmann
Thin Solid Films, 2014
Investigation of band tailing in sputtered ZnO:Al thin films regarding structural properties and impurities
Steffi Schönau, Florian Ruske, Sebastian Neubert, Bernd Rech
Materials Research Society Symposium Proceedings, 2014
Towards wafer quality crystalline silicon thin-film solar cells on glass
Jan Haschke, Daniel Amkreutz, Lars Korte, Florian Ruske, Bernd Rech
Solar Energy Materials and Solar Cells, 2014
Direct pulsed laser interference texturing for light trapping in a-Si:H/μc-Si:H tandem solar cells
S. Ring, S. Neubert, F. Ruske, B. Stannowski, F. Fink, R. Schlatmann
Proceedings of SPIE the International Society for Optical Engineering, 2014
A comparison of scattering and non-scattering anti-reflection designs for back contacted polycrystalline thin film silicon solar cells in superstrate configuration
Daniel Lockau, M. Hammerschmidt, Jan Haschke, M. Blome, F. Ruske, F. Schmidt, B. Rech
Proceedings of SPIE the International Society for Optical Engineering, 2014
Material properties of high-mobility TCOs and application to solar cells
Florian Ruske, Steffi Schönau, Sven Ring, Sebastian Neubert, Bernd Stannowski, Volker Sittinger, Stefan Götzendörfer, Bernd Rech
Proceedings of SPIE the International Society for Optical Engineering, 2014
Advanced microhole arrays for light trapping in thin film silicon solar cells
Daniel Lockau, Tobias Sontheimer, Veit Preidel, Florian Ruske, Martin Hammerschmidt, Christiane Becker, Frank Schmidt, Bernd Rech
Solar Energy Materials and Solar Cells, 2014
Very thin, highly-conductive ZnO: Al front electrode on textured glass as substrate for thin-film silicon solar cells
Sebastian Neubert, Sven Ring, Florian Welker, Stefan Götzendörfer, Florian Ruske, Bernd Stannowski, Rutger Schlatmann, Bernd Rech
Physica Status Solidi Rapid Research Letters, 2014
Optical properties and limits of a large-area periodic nanophotonic light trapping design for polycrystalline silicon thin film solar cells
Daniel Lockau, Tobias Sontheimer, Veit Preidel, Christiane Becker, Florian Ruske, Frank Schmidt, Bernd Rech
Materials Research Society Symposium Proceedings, 2013
Analysis of Urbach-like absorption tails in thermally treated ZnO:Al thin films
S. Schönau, F. Ruske, S. Neubert, B. Rech
Applied Physics Letters, 2013
Identification of intra-grain and grain boundary defects in polycrystalline si thin films by electron paramagnetic resonance
Tobias Sontheimer, Alexander Schnegg, Simon Steffens, Florian Ruske, Daniel Amkreutz, Klaus Lips, Bernd Rech
Physica Status Solidi Rapid Research Letters, 2013
Chemical interaction at the buried silicon/zinc oxide thin-film solar cell interface as revealed by hard X-ray photoelectron spectroscopy
M. Wimmer, D. Gerlach, R.G. Wilks, S. Scherf, R. Félix, C. Lupulescu, F. Ruske, G. Schondelmaier, K. Lips, J. Hüpkes, M. Gorgoi, W. Eberhardt, B. Rech, M. Bär
Journal of Electron Spectroscopy and Related Phenomena, 2013
Structural properties of Si/SiO2 nanostructures grown by decomposition of substoichiometric SiOxNy layers for photovoltaic applications
Maurizio Roczen, Abdelazize Laades, Martin Schade, Thomas Barthel, Jose Ordeñez, Jan Amaru Töfflinger, Enno Malguth, Florian Ruske, Caspar Leendertz, Lars Korte, Hartmut S. Leipner, Bernd Rech
Physica Status Solidi A Applications and Materials Science, 2013
Light trapping in polycrystalline silicon thin-film solar cells based on liquid phase crystallization on textured substrates
Daniel Amkreutz, Jan Haschke, Steffi Schonau, Florian Ruske, Bernd Rech
Conference Record of the IEEE Photovoltaic Specialists Conference, 2013
ZnO:Al with tuned properties for photovoltaic applications: Thin layers and high mobility material
Florian Ruske, Robert Rößler, Mark Wimmer, Steffi Schönau, Stefan Kämpfer, Max Hendrichs, Sebastian Neubert, Lars Korte, Bernd Rech
Proceedings of SPIE the International Society for Optical Engineering, 2013
On the influence of sub-wavelength Al/Si interface roughness on the efficiency of crystalline Si-solar cells
Frank Fenske, Florian Ruske, Benjamin M. George
Thin Solid Films, 2012
Structural investigations of silicon nanostructures grown by self-organized island formation for photovoltaic applications
Maurizio Roczen, Martin Schade, Enno Malguth, Gordon Callsen, Thomas Barthel, Orman Gref, Jan A. Töfflinger, Andreas Schöpke, Manfred Schmidt, Hartmut S. Leipner, Florian Ruske, Matthew R. Phillips, Axel Hoffmann, Lars Korte, Bernd Rech
Applied Physics A Materials Science and Processing, 2012
High mobility annealing of transparent conductive oxides
M Warzecha, J I Owen, M Wimmer, F Ruske, J Hotovy, J Hüpkes
Iop Conference Series Materials Science and Engineering, 2012
Improving the electrical and optical properties of DC-sputtered ZnO:Al by thermal post deposition treatments
Mark Wimmer, Florian Ruske, Simone Scherf, Bernd Rech
Thin Solid Films, 2012
As-grown textured zinc oxide films by ion beam treatment and magnetron sputtering
Wendi Zhang, Eerke Bunte, Florian Ruske, Dominik Köhl, Astrid Besmehn, Janine Worbs, Hilde Siekmann, Joachim Kirchhoff, Aad Gordijn, Jürgen Hüpkes
Thin Solid Films, 2012
Optical characterization of high mobility polycrystalline ZnO:Al films
Florian Ruske, Mark Wimmer, Grit Köppel, Andreas Pflug, Bernd Rech
Proceedings of SPIE the International Society for Optical Engineering, 2012
Deposition and Properties of TCOs
Florian Ruske
Engineering Materials, 2012
Reactive sputtering of ZnO/ZnO:Al contacts for chalcopyrite solar modules
Ch. Köble, R. Caballero, D. Greiner, J. Klaer, R. Klenk, F. Ruske
Thin Solid Films, 2011
Detailed comparison of transparent front contacts for thin film silicon solar cells
S. Calnan, S. Neubert, C. Nock, O. Gabriel, M. Rohde, F. Ruske, B. Stannowski, R. Schlatmann
Conference Record of the IEEE Photovoltaic Specialists Conference, 2011
Hard x-ray photoelectron spectroscopy study of the buried Si/ZnO thin-film solar cell interface: Direct evidence for the formation of Si-O at the expense of Zn-O bonds
M. Wimmer, M. Bär, D. Gerlach, R. G. Wilks, S. Scherf, C. Lupulescu, F. Ruske, R. Félix, J. Hüpkes, G. Gavrila, M. Gorgoi, K. Lips, W. Eberhardt, B. Rech
Applied Physics Letters, 2011
Pretreatment of glass substrates by Ar/O2 ion beams for the as-sputtered rough Al doped zinc oxide thin films
Wendi Zhang, Eerke Bunte, Martina Luysberg, Philipp Spiekermann, Florian Ruske, Jürgen Hüpkes
Surface and Coatings Technology, 2011
Rigorous optical simulation of light management in crystalline silicon thin film solar cells with rough interface textures
Daniel Lockau, Lin Zschiedrich, Sven Burger, Frank Schmidt, Florian Ruske, Bernd Rech
Proceedings of SPIE the International Society for Optical Engineering, 2011
Band lineup in amorphous/crystalline silicon heterojunctions and the impact of hydrogen microstructure and topological disorder
T. F. Schulze, L. Korte, F. Ruske, B. Rech
Physical Review B Condensed Matter and Materials Physics, 2011
Challenges and opportunities of electron beam evaporation in the preparation of poly-Si thin film solar cells
T. Sontheimer, C. Becker, F. Ruske, C. Klimm, U. Bloeck, S. Gall, O. Kunz, T. Young, R. Egan, J. Hüpkes, B. Rech
Conference Record of the IEEE Photovoltaic Specialists Conference, 2010
A survey of the use and application of transparent conducting oxides (TCOs)
Galvanotechnik, 2010
Impact of solid-phase crystallization of amorphous silicon on the chemical structure of the buried Si/ZnO thin film solar cell interface
M. Bär, M. Wimmer, R. G. Wilks, M. Roczen, D. Gerlach, F. Ruske, K. Lips, B. Rech, L. Weinhardt, M. Blum, S. Pookpanratana, S. Krause, Y. Zhang, C. Heske, W. Yang, J. D. Denlinger
Applied Physics Letters, 2010
Optical on-line monitoring for the long-term stabilization of a reactive mid-frequency sputtering process of Al-doped zinc oxide films
V. Sittinger, F. Ruske, A. Pflug, W. Dewald, B. Szyszka, G. Dittmar
Thin Solid Films, 2010
Improved electrical transport in Al-doped zinc oxide by thermal treatment
F. Ruske, M. Roczen, K. Lee, M. Wimmer, S. Gall, J. Hüpkes, D. Hrunski, B. Rech
Journal of Applied Physics, 2010
DC reactive sputtering of aluminium doped zinc oxide films for solar modules controlled by target voltage
Ch. Köble, D. Greiner, J. Klaer, R. Klenk, A. Meeder, F. Ruske
Thin Solid Films, 2009
Optical modeling of free electron behavior in highly doped ZnO films
F. Ruske, A. Pflug, V. Sittinger, B. Szyszka, D. Greiner, B. Rech
Thin Solid Films, 2009
Polycrystalline silicon thin-film solar cells on ZnO:AI-coated glass substrates
S. Gall, C. Becker, K.Y. Lee, B. Rau, F. Ruske, B. Rech
Conference Record of the IEEE Photovoltaic Specialists Conference, 2009
Influence of hydrogen plasma on the defect passivation of polycrystalline Si thin film solar cells
Benjamin Gorka, Björn Rau, Pinar Dogan, Christiane Becker, Florian Ruske, Stefan Gall, Bernd Rech
Plasma Processes and Polymers, 2009
Microstructure and photovoltaic performance of polycrystalline silicon thin films on temperature-stable ZnO:Al layers
C. Becker, F. Ruske, T. Sontheimer, B. Gorka, U. Bloeck, S. Gall, B. Rech
Journal of Applied Physics, 2009
Polycrystalline silicon thin-film solar cells on glass
S. Gall, C. Becker, E. Conrad, P. Dogan, F. Fenske, B. Gorka, K.Y. Lee, B. Rau, F. Ruske, B. Rech
Solar Energy Materials and Solar Cells, 2009
Solid-phase crystallization of amorphous silicon on ZnO:Al for thin-film solar cells
C. Becker, E. Conrad, P. Dogan, F. Fenske, B. Gorka, T. Hänel, K.Y. Lee, B. Rau, F. Ruske, T. Weber
Solar Energy Materials and Solar Cells, 2009
Influence of damp heat on the optical and electrical properties of Al-doped zinc oxide
D. Greiner, N. Papathanasiou, A. Pflug, F. Ruske, R. Klenk
Thin Solid Films, 2009
High power pulsed magnetron sputtering of transparent conducting oxides
V. Sittinger, F. Ruske, W. Werner, C. Jacobs, B. Szyszka, D.J. Christie
Thin Solid Films, 2008
Reactive deposition of aluminium-doped zinc oxide thin films using high power pulsed magnetron sputtering
F. Ruske, A. Pflug, V. Sittinger, W. Werner, B. Szyszka, D.J. Christie
Thin Solid Films, 2008
Polycrystalline silicon thin-film solar cells on ZnO:Al coated glass
Christiane Becker, Pinar Dogan, Benjamin Gorka, Florian Ruske, Tobias Hänel, Jan Behrends, Frank Fenske, Klaus Lips, Stefan Gall, Bernd Rech
Materials Research Society Symposium Proceedings, 2008
Temperature stability of ZnO:Al film properties for poly-Si thin-film devices
K. Y. Lee, C. Becker, M. Muske, F. Ruske, S. Gall, B. Rech, M. Berginski, J. Hüpkes
Applied Physics Letters, 2007
Flux of positive ions and film growth in reactive sputtering of Al-doped ZnO thin films
Florian Ruske, Volker Sittinger, Wolfgang Werner, Bernd Szyszka, Ruben Wiese
Plasma Processes and Polymers, 2007
Determination of plasma parameters during deposition of ZnO films by ceramic and metallic targets and correlation withfilm properties
Ruben Wiese, Holger Kersten, Mario Hannemann, Volker Sittinger, Florian Ruske, Richard Menner
Plasma Processes and Polymers, 2007
Large area ZnO:Al films with tailored light scattering properties for photovoltaic applications
F. Ruske, C. Jacobs, V. Sittinger, B. Szyszka, W. Werner
Thin Solid Films, 2007
Process stabilisation for large area reactive MF-sputtering of Al-doped ZnO
F. Ruske, A. Pflug, V. Sittinger, W. Werner, B. Szyszka
Thin Solid Films, 2006
ZnO:Al films deposited by in-line reactive AC magnetron sputtering for a-Si:H thin film solar cells
V. Sittinger, F. Ruske, W. Werner, B. Szyszka, B. Rech, J. Hüpkes, G. Schöpe, H. Stiebig
Thin Solid Films, 2006
ZnO:Al films for a-Si:H thin film solar cells
Proceedings Annual Technical Conference Society of Vacuum Coaters, 2005
Hydrogen doping of ZnO:Al films deposited by pulsed DC-sputtering of ceramic targets
Proceedings Annual Technical Conference Society of Vacuum Coaters, 2005
Model prediction and emprical confirmation of rate scaling with peak power for high power pulse magnetron sputtering (HPPMS) deposition of thin Ag films
Proceedings Annual Technical Conference Society of Vacuum Coaters, 2005
Hydrogen doping of DC sputtered ZnO:Al films from novel target material
F. Ruske, V. Sittinger, W. Werner, B. Szyszka, K.-U. van Osten, K. Dietrich, R. Rix
Surface and Coatings Technology, 2005
Optical characterization of aluminum-doped zinc oxide films by advanced dispersion theories
Andreas Pflug, Volker Sittinger, Florian Ruske, Bernd Szyszka, Georg Dittmar
Thin Solid Films, 2004

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