Current Projects
Synergistically application of electronic structure engineering and microstructure engineering for development of cobalt-free high voltage cathodes for Na-ion batteries
Brief description:
The market of Li-ion batteries is currently the most dynamically growing field of electrical energy storage. Since resources of lithium and cobalt are limited, Co-free and Li-free Na-ion batteries have been recognized as potential candidates for next-generation rechargeable batteries. The project presents a unique approach called “electronic and microstructure engineering” in the development of high voltage Na2M2(SO4)3 (M = Fe, Mn, Ni…) cathode material for Na-ion batteries. Thereby, a green method of synthesis of Na2M2(SO4)3 will be used leading to a significantly reduced impurity level (3 wt.%) and a high Fe3+/Fe2+ redox potential. Such high potential combined with large capacity for sodium intercalation leads to a high theoretical energy density that is competitive with Li-ion analogues.
The project combines interdisciplinary research areas of chemistry, physics, solid state electrochemistry, and DFT computer modeling to elucidate the role of the cathode material or the nanoscale Na2M2(SO4)3/carbon composite to optimize its chemical composition, morphology, structural and transport properties as well as synthesis processes, and control the electrochemical battery processes.
Understanding the relationship between crystal and electronic structure, valence states, transport properties and reactivity with respect to sodium will be an important tool for designing a high efficiency of the sodium intercalation process and consequently high battery performance and reliability.
The materials’ morphology is a crucial factor in designing high-performance electrochemical systems. A tailored 3D microstructure development of the cathode requires a quantitative determination of 3D parameters such as permeability, tortuosity (interconnectivity of pores) and fluid-dynamic behavior, which are major parameters for batteries that have to be optimized. A novel transmission X-ray microscope for a wide range of photon energies combined with a chamber for electrochemical processes will enable non-destructive high-resolution operando imaging of kinetic processes to correlate battery performance with the microstructure of composite cathode materials.
Cooperation Partner:
- Prof. Dr.-Ing. habil. Janina Maria Molenda
AGH University of Science and Technology
Faculty of Energy and Fuels
al. A. Mickiewicza 30,
30-059 Kraków, małopolskie, Poland
Project manager:
Honorarprofessor Dr. rer. nat. habil. Ehrenfried Zschech
Duration:
15.10.2023-14.10.2026
Index of advancement:
ZS 12/23-1
Project number:
504885810 (GEPRIS)
Promotional institution:
German Research Foundation (DFG)
Keywords:
polyanion compounds, cathode material, Na-ion batteries, intercalation process
MOVPE growth and characterization of (AlxGa1-x)2O3 thin films for high power devices
Brief description:
Beta-type gallium oxide (β-Ga2O3) provides promising perspectives for high-power applications outperforming current key technology because for β-Ga2O3 a considerably stronger electrical breakdown field is predicted. In addition, it offers potentially low cost and large substrate size preparation from bulk crystals with controllable n-type doping in comparison to other promising materials. The performance of high-power devices directly depends on the breakdown field to the power of three as well as on the mobility of the charge carriers. The incorporation of aluminum into β-Ga2O3 allows tuning the band gap and consequently the breakdown field. Therefore, a suitable material growth method is required resulting in high-quality binary oxide thin films with optimized band gap and uncompromised materials properties.
Hence, in this project we propose to develop a novel approach based on metal-organic vapor phase epitaxy (MOVPE) of β-(AlxGa1-x)2O3 (AlGaO) thin films on lattice-matched (100)-oriented β-Ga2O3 enabling the growth at temperatures above 800°C with an enhanced solubility of aluminum in β-Ga2O3. For this purpose, we will initially grow bulk aluminum-doped β-Ga2O3 single crystals exhibiting a minimal lattice mismatch with the targeted AlGaO films. Subsequently, the quasi-homoepitaxial growth of high-quality AlGaO thin films on these substrates by MOVPE will be engineered and optimized thanks to the detailed insights from sophisticated materials characterization. Our concerted, systematic use of atomic force, electron, and photoemission microscopy, in situ x-ray and electron diffraction, spectroscopic ellipsometry as well as photoelectron spectroscopy techniques will facilitate to unravel the growth mode, morphology, composition as well as the structural, electronic, electrical, and optical properties of the AlGaO thin films.
Specifically, we will determine the limiting factors for Al distribution and its maximally possible incorporation into β-Ga2O3 without phase separation. Then, we will explore the possibilities for band gap and strain engineering in the AlGaO system, investigate the surface morphology as well as the interface of the AlGaO on β-Ga2O3 system, and perform electrical and structural analysis to understand the process of defect formation and the role of impurities.
Our strategy is threefold: (1) preparation of epitaxy-ready aluminum-doped (up to 15%) bulk β-Ga2O3 crystals (2 cm to 2 inches in diameter) as substrates for the subsequent quasi-homoepitaxial growth of AlGaO thin layers and characterization of the obtained films to (2) optimize the growth and to (3) evaluate the application-relevant properties. Particularly, the project focuses on the preparation and characterization of epitaxial AlGaO with maximum aluminum incorporation resulting in the highest possible increase of the band gap and the breakdown field.
Cooperation Partner:
- Dr. Andreas Popp and Dr. Zbigniew Galazka
Leibniz-Institut für Kristallzüchtung (IKZ)
Abteilung Schichten und Nanostrukturen
Max-Born-Straße 2
12489 Berlin
- Dr. Vedran Vonk
Deutsches Elektronen-Synchrotron (DESY) Standort Hamburg DESY
Research Group X-ray Physics and Nanoscience
DESY Nanolaboratory
Notkestr. 85
D-22607 Hamburg
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Duration:
01.01.2023-31.12.2025
Index of advancement:
FL 548/13-1
Project number:
491040331 (GEPRIS)
Promotional institution:
German Research Foundation (DFG)
Keywords:
gallium oxide, metal-organic vapor phase epitaxy, materials characterization, photoelectron spectroscopy, X-ray diffraction
Innovation campus electronics and microsensing Cottbus - iCampus2Topic: »Environmental Sensors«; Subproject: »Sensor technology for fluid fuels«
Brief description
In the context of the energy transition, Lusatia as a traditional energy region is structurally changing from a coal-mining region to a model region for the hydrogen strategy, with (carbon) hydrocarbons (synthetic fuels) as important energy carriers of the future for stationary and mobile applications. This creates an enormous demand for powerful sensors for safety-related monitoring during transport and storage of the fluid fuels as well as their use by the end customer.
The goal of this subproject is a combined sensor array based on the merging of two technologies (IHP, IPMS) for the future synchronous detection of hydrogen and hydrocarbons, which is self-calibrating and can be coupled to existing sensor networks.
To this end, the sensor concepts for resistive and optical silicon-based sensors developed in the first phase of iCampµs will initially be consolidated in the second phase through design and material optimization steps. In parallel, the technological approaches for the realization of matrix arrangements will first be created, which in perspective will form the basis on the one hand for the connection of several sensors (e.g. electronic noses) and on the other hand for intelligent signal processing. Subsequently, the two sensor principles are to be merged into a CMOS-compatible platform, including a digital interface with generic functionality. In the process, a configurable multi-purpose platform for signal and data processing with the ability to interface to standard wired and wireless industrial networks and to a 5G standard platform will be developed.
Cooperation Partner:
- Chair of Experimental Physics and functional Materials
Brandenburg University of Technology Cottbus - Senftenberg
Prof. Dr. rer. nat. habil. Inga Fischer
Erich-Weinert-Straße 1
03046 Cottbus
Chair of Micro and nano systems
Brandenburg University of Technology Cottbus - Senftenberg
Prof. Dr.-Ing. Dr. rer. nat. habil. Harald Schenk
Konrad-Zuse-Straße 1
D-03046 Cottbus- IHP GmbH – Leibniz Institut für innovative Mikroelektronik
Prof. Dr. rer. nat. habil. Christian Wenger
Im Technologiepark 25
15236 Frankfurt (Oder)
- Fraunhofer Institute for Photonic Microsystems (IPMS)
Institute section »Integrated Silicon Systems«
Dr. Sebastian Meyer
Konrad-Zuse-Straße 1
03046 Cottbus
- Chair of Computer Engineering
Brandenburg University of Technology Cottbus - Senftenberg
Prof. Dr.-Ing. Michael Hübner
(Dr.-Ing. Marc Reichenbach, Substitute Professor)
Konrad-Wachsmann-Allee 5
03046 Cottbus
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Duration:
01.01.2022 – 31.12.2026
Index of advancement:
16ME0420K
Promotional institution:
Federal Ministry of Education and Research (BMBF)
within the German Federal Government’s Framework Programme for Research and Innovation 2021–2024
»Microelectronics. Trustworthy and sustainable. For Germany and Europe.«
Keywords:
gas sensors, micro-structering, atomic layer deposition, sensor platform, intelligent signal processing
Further information:
- iCampus hompage
- Kick-Off Meeting iCampμs Cottbus Phase II (Stream)
(Copyright: loewn|logulago GmbH)
Joint project EIZ: Energy Innovation Center of the Brandenburg University of Technology Cottbus-SenftenbergEnergy Storage and Conversion Facility ("ES&EW" Lab)
Brief description (only in German)
Im »ES&EW«-Labor sollen die drei Ebenen für Sektor-gekoppelte Energiesysteme – Wärme, Strom und Mobilität – in einem CO2 neutralen Kreislaufansatz, basierend auf Wasserstoff, abgebildet werden.
Auf allen Ebenen werden dafür die entsprechenden Elemente des Kreislaufansatzes entwickelt und optimiert, beginnend mit der Wasserstoffproduktion in unterschiedlichen Druckstufen und Verfahrenstechniken entsprechend des gewünschten Einsatzes (Hochdruck → Mobilität, Niederdruck → weitere Synthese).
Darauf aufbauend geht es um die Weiterverarbeitung des Wasserstoffs zu den synthetischen Kohlenwasserstoffen Methan und Methanol, sowie deren Rückverstromung im Oxyfuel-Prozess für eine emissionsfreie Rückführung der Abgase, in Form von hochkonzentriertem und reinem CO2, in den Stoffkreislauf.
Dabei wird jede der drei Ebenen in einem verständnisbasierten und simulationsgestützten Entwicklungsprozess im engen Austausch mit den EIZ-Einrichtungen EECON, DIVERSY, Scale-Up Lab, MoWes und SCL, für den Einsatz im Kreislaufsystem optimiert und weiterentwickelt.
In dem neu aufzubauenden »ES&EW«-Labor wird mit fortschrittlicher Messtechnik eine detaillierte Charakterisierung der Materialien, Komponenten und Prozessführung sowie die Optimierung ihres Zusammenspiels angestrebt.
Dazu wird aufbauend auf detaillierten experimentellen Analysen eine neuartige modellbasierte Simulations- und Optimierungsplattform entwickelt, die eine umfangreiche Prototypenvalidierung im frühen Entwicklungszeitraum ermöglicht.
Cooperation Partner:
- Chair of Thermal Energy Technology
Brandenburg University of Technology
Prof. Dr. rer. nat. Lars Röntzsch
Siemens-Halske-Ring 13
03046 Cottbus
Chair of Ccombustion Engines and Flight Propulsion
Brandenburg University of Technology
Prof. Dr.-Ing. Heinz Peter Berg
Siemens-Halske-Ring 14
03046 Cottbus- Chair of Thermodynamics/Thermal Process Engineering
Brandenburg University of Technology
Prof. Dr.-Ing. Fabian Mauß
Siemens-Halske-Ring 8
03046 Cottbus
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Fabian Rachow
Duration:
01.08.2022 – 31.07.2026
Index of advancement:
03SF0693A
Promotional institution:
Federal Ministry of Education and Research (BMBF)
Funds of BMBF and funds for measures to strenghten the coal region
Keywords:
Sector coupling, CO2-free circular economy, synthetic fuels
Lab infrastructure for the Energy Innovation Center of the Brandenburg University of Technology Cottbus-SenftenbergEnergy Storage and Conversion Facility (»ES&EW« Lab)
Brief description
Within the framework of this project, the infrastructural requirements for the »ES&EW« laboratory are being created.
Cooperation Partner:
- Chair of Thermal Energy Technology
Brandenburg University of Technology
Prof. Dr. rer. nat. Lars Röntzsch
Siemens-Halske-Ring 13
03046 Cottbus
Chair of Ccombustion Engines and Flight Propulsion
Brandenburg University of Technology
Prof. Dr.-Ing. Heinz Peter Berg
Siemens-Halske-Ring 14
03046 Cottbus- Chair of Thermodynamics/Thermal Process Engineering
Brandenburg University of Technology
Prof. Dr.-Ing. Fabian Mauß
Siemens-Halske-Ring 8
03046 Cottbus
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Fabian Rachow
Duration:
29.09.2022 – 30.06.2026
Index of advancement:
85056897
Promotional institution:
This project is supported by the federal government with funds from the Coal Regions Investment Act and co-financed with funds from the state of Brandenburg.
Further information:
BTU-BAM Graduate School »Trustworthy Hydrogen«PhD Topic 2 »Novel materials and coatings for the detection of hydrogen and hydrocarbons«
Investigation of key properties of thin film oxide semiconductors for gas sensing applications
Brief description:
The fundamental objective of the project is to consolidate bilateral cooperation between the Brandenburg Technical University Cottbus-Senftenberg (Chair of Applied Physics and Semiconductor Spectroscopy) and Wroclaw University of Science and Technology (Chair of Microelectronics and Nanotechnology) and to improve skills and competences of young researchers of both cooperating teams in the field of fabrication and diagnostics of advanced structures based on semiconducting oxides, designed for sensor applications. In particular, the focus lies on the optimization of key parameters in the fabrication of innovative thin film oxide nanomaterials for resistive, electrochemical, and optical (gasochromic) sensors , designed for the detection of various gases (including nitric oxides, ammonia, methane, hydrogen) and vapours of volatile organic compounds (e.g., ethanol). A mass spread of hydrogen utilization in renewable energy technologies requires the ongoing development of sensors and detectors to enable the safe and sustainable hydrogen use, transport, and storage. In this sense, several metal oxides (e.g., CeOx, SnOx, In2O3, VO3, WOx, etc.) exhibit a strong chemical reactivity towards reducible gases (e.g., H2 and hydrocarbons), concomitant with a significant change in materials properties such as electrical conductivity. The reducibility of these oxides can be selectively modified by alloying them with additional elements, which allows the targeting of parameters such as sensitivity, selectivity, and cross-sensitivity for specific gases and making these materials promising candidates for its use as active layers in chemical sensors. Moreover, the combination of rare-earth and transition metal oxides with different principles such as doping and use of multilayers or colored surfaces, has become an exciting route toward achieving relatively low operating temperatures (<100 °C) for metal oxide-based sensors.
Cooperation Partner:
- Chair of Microelectronics and Nanotechnology
Wrocław University of Science and Technology
Prof. DSc. PhD. Eng. Jarosław Domaradzki
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Project assistance:
Dr. Małgorzata Kot
Duration:
01.01.2023 - 31.12.2024
Project number:
57656558
Promotional institution:
German Academic Exchange Service (DAAD)
Programme for Project-Related Personal Echange (PPP) with Poland 2023-2025
Keywords:
metal oxide sensors for hydrogen and hydrocarbon detection
Al2O3-ALD on hybride perovskite layers Sub-project: Preparation of the perovskite layers and spectrosocopic characterization of the ALD and perovskite layers
Brief description
The overall objective of the project is to further develop an atomic layer deposition (ALD) process of high quality ultrathin alumina films for their low temperature (~80°C) deposition on large area organic-inorganic perovskite layers. The synthesis and deposition of the perovskite layers will also be developed within the project. The ALD process on perovskite layers will primarily be applied for passivation layers in perovskite solar cells (PSCs), but it is also highly relevant for other optoelectronic devices and e.g. sensors and batteries. PSCs have experienced an immense increase in efficiency within a very short time, but their low long-term stability is the main obstacle to market introduction. To increase the long-term stability, an ultra-thin ALD passivation layer is used, which is produced at low process temperatures and in a very controlled manner preventing the thermally sensitive perovskite layers from degradation and ensuring the necessary transport of the charge carriers generated by the photoelectric conversion through the passivation layer to the electrode.
Cooperation partner:
SENTECH Instruments GmbH
Schwarzschildstraße 2
12489 Berlin
Project manager:
Prof. Dr. rer. nat. habil. Jan Ingo Flege
Dr. rer. nat. Małgorzata Kot
Duration:
01.07.2021 – 31.03.2024
Index of advancement:
KK508760BR1
Promotional institution:
Federal Ministry for Economic Affairs and Climate Action (BMWK) in the framework of Central Innovation Programme for SMEs (ZIM)
Keywords:
Atomic layer deposition, perovskite solar cells