Research interest
- Melt and flux growth of oxides and fluorides for optical, piezoelectric and laser crystals, and as substrates for novel electronic devices.
- Growth and characterization of wide-bandgap semiconductor bulk crystals. These crystals are used as substrate material in semiconductor technology.
- Growth and characterization technologies, correlation between preparation and properties of bulk single crystals in a general sense.

Initiativgemeinschaft außeruniversitärer Forschungsinstitute in Adlershof
Member of the board since 2015

Workshop on Oxide, Dielectric, and Laser Crystals
IRIS Berlin, Sep 21-22, 2023

Periodic Low-Dimensional Defect Structures in Polar Oxides
Summer school on polar oxides, IKZ Berlin, Sep 6-8, 2023

Int. Workshop on UV Materials and Devices, June 5-8, 2023
Program committee member

International Conference on Crystal Growth and Epitaxy
Naples, July 30-Aug 4, 2023
Program committee member

Read my Book chapter on AlN bulk crystal growth in
III-Nitride Ultraviolet Emitters, Springer Verlag 2016

Read my book chapter on bulk crystal growth of SiC and AlN in the Elsevier Handbook of Crystal Growth, 2nd Ed., Vol. 2A

Last changes on this homepage: May 18, 2023
Co-authored submissions and recent publications:
- Solid Solutions of Lithium Niobate and Lithium Tantalate: Crystal Growth and the Ferroelectric Transition
Ferroelectrics (2023) in press - Bulk Single Crystals and Physical Properties of ß-(AlxGa1-x)2O3 (x = 0- 0.35) Grown by the Czochralski Method J. Appl. Phys. 133 (2023) 035702
- Dislocation Climb in AlN Crystals Grown at Low Temperature Gradients Revealed by 3D X-Ray Imaging Crystal Growth Des. 23 (2023) 1538-1546
- The Thermal Conductivity Tensor of β-Ga2O3 from 300 to 1275 K Cryst. Res. Technol. 58 (2023) 2200204
- Fingerprints of Carbon Defects in Vibrational Spectra of GaN Considering the Isotope Effect Phys. Rev. B 106 (2022) 184110
- Wüstite (Fe1-xO) - Thermodynamics and Crystal Growth Z. Naturforsch. B 77 [6] (2022) 463-468
Recent abstracts and presentations:
- Gallium Oxide Bulk Crystals Prepared by the Czochralski Method, (100) Substrates, and Homoepitaxy Results (Vortrag auf dem 6. Internationalen Workshop über UV-Materialien und Bauelemente 2023 (IWUMD 2023), Metz, France on Jun 5-8, 2023)
- Crystals, Substrates, and Technologies for Ga2O3 and Functional Oxides (Eingeladener Vortrag auf der 50. Jahrestagung der Niederländischen Kristallzüchtungs-Gesellschaft (DACG50), Amsterdam, The Netherlands on Mar 20-22, 2023)
- Melt growth of Bulk β-Ga2O3 Bulk Crystals (Vortrag im Halbleiter-Kolloquium des Clusters Leistungselektronik am Fraunhofer IISB (online) on Nov 21, 2022)
- Research Topics at IKZ Berlin - Targeting Innovations in & by Crystalline Materials for Society (Presentation at the SiMAP Colloquium, Université Grenoble-Alpes, Grenoble, France on Oct 27, 2022.
- Bulk β-Ga2O3 Single Crystals Grown by the Czochralski Method (Invited talk at the DGKK workshop on "Bulk Semiconductor Crystals", Freiberg/Saxony on Oct 5-6, 2022)
- Favorable Growth Conditions and Diameter Enlargement of Bulk AlN Single Crystals Grown by Physical Vapor Transport (Presentation at the DGKK workshop on "Bulk Semiconductor Crystals", Freiberg/Saxony on Oct 5-6, 2022)
- Bulk Single Crystals of Transparent Semiconducting Oxides (Oral talk at the 11. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2022), online (Lyon, France) on Sep 15-16, 2022)
- Preparation of Perovskite, Pyrochlore and Magnetoplumbite Crystals for Advanced Functional Oxides (Presentation at the 7. European Conference on Crystal Growth (ECCG-7), Paris, France on Jul 25-27, 2022)
- Favorable Growth Conditions and Diameter Enlargement of Bulk AlN Single Crystals Grown by Physical Vapor Transport (Presentation at the 7. European Conference on Crystal Growth (ECCG-7), Paris, France on Jul 25-27, 2022)
Conference organisation:
- 10. International Conference on Nitride Semiconductors (ICNS-14), Nov 14-19, 2023 in Fukuoka, Japan
(Member of the program committee) - 12. Workshop on Oxide, Dielectric, and Laser Crystals, Sep 21-22, 2023 in Berlin
(Main Organizer) - Summer school on "Periodic Low-Dimensional Defect Structures in Polar Oxides", Sep 6-8, 2023 in Berlin
(Local Organizer) - 20. International Conference on Crystal Growth (ICCGE-20), Jul 30-Aug 4, 2023 in Naples, Italy
(Member of the program committee) - 6. International Workshop on UV Materials and Devices (IWUMD 2023), May 5-8, 2023 in Metz, France
(Member of the materials program comittee)