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.
(Overview on granted projects)
former member of the material science review board 2020-2024
Member since 2010Co-chair of the focus group "oxide crystals" since 2023
Initiativgemeinschaft außeruniversitärer Forschungsinstitute in AdlershofMember of the board since 2015
Algiers, 26.-28. Nov. 2024Eingeladener Vortrag (online)
German-French Annual Crystal Growth Meeting (DKT 2025), Frankfurt/Main, March 5-7, 2025
Co-founder and Associate Member of Berlin Research 50
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
IKZ is member of the Leibniz association
JCG Editor since 2020
PCGCM Assoc. Editor since 2014
Last changes on this homepage: November 23, 2024
Co-authored submissions and recent publications:
- Prediction of Impurity Concentrations by Absorption Spectra in AlN Single Crystals Using Random Forest Regression CrystEngComm 27 (2025) 184-190
- Bulk Single Crystals and Physical Properties of Rutile-GeO2 for High Power Electronics and DUV Optoelectronics Phys. Status Solidi B (2025) Early View, DOI: 10.1002/pssb.202400326
- Solid-Solution Limits and Thorough Characterization of Bulk β-(AlxGa1-x)2O3 Single Crystals Grown by the Czochralski Method Adv. Mater. Interfaces 12 (2025) 2400122
- Thermal Conductivity in Solid Solutions of Lithium Niobate Tantalate Single Crystals from 300K up to 1300K J. Alloys Compounds 1008 (2024) 176549
- Evaluation and Thermodynamic Optimization of Phase Diagram of Lithium Niobate Tantalate Solid Solutions J. Mater. Sci. 59 (2024) 12305-12316
- Efficient Diameter Enlargement of Bulk AlN Single Crystals with High Structural Quality Appl. Phys. Express 16 (2023) 075502
- Fanout Periodic Poling of BaMgF4 Crystals Opt. Mater. Express 13 [8] (2023) 2158-2164
- Solid Solutions of Lithium Niobate and Lithium Tantalate: Crystal Growth and the Ferroelectric Transition Ferroelectrics 613 (2023) 250-262
- Bulk Single Crystals and Physical Properties of β-(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
Recent abstracts and presentations:
- Growth of Bulk Single Crystals of Novel Semiconductor Materials (AlN, Ga2O3, etc.) for Next Generation Efficient Power Electronics
Invited talk at the 2. International Conference on Materials for Energy & Environmental Engineering (ICM3E 2024)
Algiers, Algeria on Nov 26-28, 2024 - Bulk Crystals for Novel Semiconductors Prepared at IKZ: Gallium Oxide and Beyond
Presentation at the DGKK workshop on "Bulk Semiconductor Crystals"
Berlin-Adlershof on Oct 9-10, 2024 - Growth and Investigation of Hexagallate Substrate Crystals for Strain-engineered Functional Oxide layers
Poster at the 8. European Conference on Crystal Growth (ECCG-8)
Warsaw, Poland on Jul 21-25, 2024 - Co-doping Effects on Anti-Stokes Fluorescence Cooling in Yb:YLF
Poster at the Annual conference of the DGKK (DKT 2024)
Erlangen on Mar 6-8, 2024
and at the 8. European Conference on Crystal Growth (ECCG-8)
Warsaw, Poland on Jul 21-25, 2024 - AlN Substrates for UV and Power Applications
Lecture at the 5. IKZ Winter School (IKZ-School 2024)
IKZ Berlin on Feb 28-Mar 1, 2024
Conference organisation:
- Annual conference of the DGKK (DKT 2025), Mar 5-7, 2025 in Frankfurt
(Member of the Program Committee) - International Workshop on Nitride Semiconductors 2024 (IWN 2024), Nov 3-8, 2024 in Oahu, Hawaii, USA
(Member of the Topical Program Committee Bulk Growth Sessions) - DGKK workshop on "Bulk Semiconductor Crystals", Oct 9-10, 2024 in Berlin
(Conference chair and chief organizer) - 8. European Conference on Crystal Growth (ECCG-8), Jul 21-25, 2024 in Warsaw, Poland
(Member of the International Advisory Committee)