'Own contributions' link to presentations and posters, additional data is provided when I participated in conference organisation.

• Annual conference of the DGKK (DKT 2025)
  Frankfurt, Mar 5-7, 2025
  Own contribution: Oral presentation about "Crystals and Substrates for Next-Generation Oxide Semiconductor Devices"
  Member of the Program Committee
• 2. International Conference on Materials for Energy & Environmental Engineering (ICM3E 2024)
  Algiers, Algeria (online contribution), Nov 26-28, 2024
  Own contribution: Oral presentation about "Growth of Bulk Single Crystals of Novel Semiconductor Materials (AlN, Ga₂O₃, etc.) for Next Generation Efficient Power Electronics"
• DGKK workshop on "Bulk Semiconductor Crystals"
  Berlin-Adlershof, Oct 9-10, 2024
  Conference chair and chief organizer
  Own contribution: Oral presentation about "Bulk Crystals for Novel Semiconductors Prepared at IKZ: Gallium Oxide and Beyond"
• 13. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2024)
  Grenoble, France, Sep 18-19, 2024
  (no own contribution)
• 8. European Conference on Crystal Growth (ECCG-8)
  Warsaw, Poland, Jul 21-25, 2024
  Own contribution: Poster about "Co-doping Effects on Anti-Stokes Fluorescence Cooling in Yb:YLF"
  Own contribution: Poster about "Growth and Investigation of Hexagallate Substrate Crystals for Strain-engineered Functional Oxide layers"
  Member of the International Advisory Committee
• Annual conference of the DGKK (DKT 2024)
  Erlangen, Mar 6-8, 2024
  Own contribution: Poster about "Co-doping Effects on Anti-Stokes Fluorescence Cooling in Yb:YLF"
• DGKK workshop on "Bulk Semiconductor Crystals"
  Erlangen, Oct 4-5, 2023
  (no own contribution)
• 12. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2023)
  HU Berlin, Sep 21-22, 2023
  Conference chair and chief organizer
• DFG Research Group FOR 5044 Summer School
  IKZ Berlin, Sep 6-8, 2023
  Own contribution: Oral presentation about "Leibniz-Institut für Kristallzüchtung - Innovations in & by Crystalline Materials"
  Head of the Local Organization Comittee
• 6. International Workshop on UV Materials and Devices 2023 (IWUMD 2023)
  Metz, France, Jun 5-8, 2023
  Own contribution: Oral presentation about "Gallium Oxide Bulk Crystals Prepared by the Czochralski Method, (100) Substrates, and Homoepitaxy Results"
  Member of the Program Committee and Session chair
• 50th Anniversary Symposium of the Dutch Association for Crystal Growth (DACG50)
  Amsterdam, The Netherlands, Mar 20-22, 2023
  Own contribution: Invited talk about "Crystals, Substrates, and Technologies for Ga₂O₃ and Functional Oxides"
• DGKK workshop on "Materials with Correlated Electrons"
  IFW Dresden, Oct 6-7, 2022
  (no own contribution)
• DGKK workshop on "Bulk Semiconductor Crystals"
  Freiberg/Saxony, Oct 5-6, 2022
  Own contribution: Invited talk about "Bulk β-Ga₂O₃ Single Crystals Grown by the Czochralski Method"
  Own contribution: Oral presentation about "Favorable Growth Conditions and Diameter Enlargement of Bulk AlN Single Crystals Grown by Physical Vapor Transport"
• 11. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2022)
  online (Lyon, France), Sep 15-16, 2022
  Own contribution: Oral presentation about "Bulk Single Crystals of Transparent Semiconducting Oxides"
• 7. European Conference on Crystal Growth (ECCG-7)
  Paris, France, Jul 25-27, 2022
  Own contribution: Oral presentation about "Preparation of Perovskite, Pyrochlore and Magnetoplumbite Crystals for Advanced Functional Oxides"
  Own contribution: Oral presentation about "Favorable Growth Conditions and Diameter Enlargement of Bulk AlN Single Crystals Grown by Physical Vapor Transport"
  Session Chair "Semiconductors"
• 8. International Workshop on Crystal Growth Technology (IWCGT-8)
  Berlin, May 29-Jun 2, 2022
  Conference chair and chief organizer
• Annual conference of the DGKK (DKT 2021)
  IKZ Berlin, Oct 6-8, 2021
  Conference chair and chief organizer
• 10. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2021)
  Idar-Oberstein, Sep 16-17, 2021
  Own contribution: Oral presentation about "Substrate Crystals for Advanced Functional Oxides"
• Advanced Solid State Lasers Conference of the OSA (ASSL 2021)
  online (planned for Toronto, Canada), Sep 13-16, 2021
  Member of the Materials Program Committee
• Advanced Solid State Lasers Conference of the OSA (ASSL 2020)
  online (planned for Quebec, Kanada), Oct 12-16, 2020
  Member of the Materials Program Committee
• 9. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2020)
  IKZ Berlin, Sep 17-18, 2020
  Conference chair and chief organizer
  Own contribution: Poster about "Oxides and Fluorides at IKZ"
• Annual conference of the DGKK "50 years of DGKK" (DKT 2020)
  Munich-Garching, Mar 11-13, 2020
  Own contribution: Oral presentation about "Crystal Growth of Oxides and Fluorides at the IKZ"
• IEEE Milestone Event in Memorandum of Jan Czochralski at the HTW
  Berlin, Nov 15, 2019
  Own contribution: Invited talk about "Jan Czochralski and the Decisive Impact of his Invention on Modern Technology"
• DGKK workshop on "Bulk Semiconductor Crystals"
  IKZ Berlin, Oct 9-10, 2019
  Conference chair and chief organizer
  Own contribution: Oral presentation about "Crystals and Substrates for Semiconducting Oxide Applications"
• 8. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2019)
  Lyon, France, Sep 19-20, 2019
  (no own contribution)
• 18. Conference on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP-18)
  Berlin, Sep 8-12, 2019
  Conference chair and chief organizer (together with Anna Mogilatenko)
• 1st International Workshop on AlGaN based UV-Laserdiodes (IWUVLD 2019)
  Berlin, Aug 26-30, 2019
  Own contribution: Invited talk about "Native AlN substrates"
• Joint annual conference of the DGKK and the PTWK (DKT 2019)
  Poznan, Poland, Mar 17-21, 2019
  (no own contribution)
  Organizer of the session "Dielectrics and intermetallics" (with Andreas Erb)
• International Workshop on Nitride Semiconductors 2018 (IWN 2018)
  Kanazawa, Japan, Nov 11-16, 2018
  Own contribution: Invited talk about "On the preparation of AlN single crystals and substrates for AlGaN devices"
  Member of the Program Committee, of the Topical Committee for Session A (Bulk Growth), and Session Chair
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Erlangen, Oct 10-11, 2018
  (no own contribution)
• European Materials Research Society Fall Meeting 2018 (Symposium P) (EMRS Fall 2018)
  Warsaw, Poland, Sep 17-20, 2018
  Conference chair and chief organizer Symposium P: Epitaxial Oxide Films for Electronic Applications
• 7. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2018)
  FEE Idar-Oberstein, Sep 13-14, 2018
  Own contribution: Oral presentation about "Crystals and Substrates for Semiconducting Oxide Applications"
• ICULTA 2018 - IUVA-AUVL Joint International Conference UV LED Technologies & Applications (ICULTA 2018)
  Berlin, Apr 22-25, 2018
  (no own contribution)
• 2. International Workshop on UV Materials and Devices 2017 (IWUMD 2017)
  Fukuoka, Japan, Nov 14-18, 2017
  Own contribution: Invited talk about "Status and Challenges of AlN Bulk Crystal Growth for Use as Substrates in Deep-UV Applications"
  Member of the Program Committee
• 17. Conference on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP-17)
  Valladolid, Spain, Oct 8-12, 2017
  Own contribution: Invited talk about "Defects in AlN Bulk Crystal Substrates for UV LEDs and Lasers"
• 6. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2017)
  Bordeaux, France, Sep 14-15, 2017
  (no own contribution)
• 7. International Workshop on Crystal Growth Technology (IWCGT-7)
  Potsdam, Jul 2-6, 2017
  Conference chair and chief organizer
• Compound Semiconductor Week 2017 (CSW 2017)
  Berlin, May 14-18, 2017
  Own contribution: Oral presentation about "Status of AlN Bulk Crystal Growth for Use as Substrates in Deep-UV Applications"
• 92. Annual Meeting of the German Ceramic Society (DKG 2017)
  TU Berlin, Jul 19-22, 2017
  Own contribution: Oral presentation about "Oxide and Nitride Single Crystals for Novel Optical and Electronic Applications"
• Joint Annual Conference of the DGKK and the SSC (DKT 2017)
  University of Freiburg, Mar 8-10, 2017
  Own contribution: Oral presentation about "Status of AlN Bulk Crystal Growth for Use as Substrates in Deep-UV Applications"
• International Workshop on Nitride Semiconductors 2016 (IWN 2016)
  Orlando, Florida, USA, Oct 2-7, 2016
  Own contribution: Oral presentation about "Epitaxial Growth and Characterization of Deep UV AlGaN Devices on Bulk AlN Substrates"
  Own contribution: Poster about "Strongly Enhanced Deep UV Transparency of AlN Bulk Crystals Grown by Physical Vapor Transport"
  Member of the Program Committee, of the Topical Committee for Session A (Bulk Growth), and Session Chair
• European Materials Research Society Fall Meeting 2016 (Symposium F) (EMRS Fall 2016)
  Warsaw, Poland, Sep 19-22, 2016
  Conference chair and chief organizer Symposium F: AlN and AlGaN Materials and Devices
• 5. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2016)
  IKZ Berlin, Sep 15-16, 2016
  Conference chair and chief organizer
• German-Japanese Gallium Oxide Technology Meeting 2016 (GAO 2016)
  IKZ Berlin, Sep 7-9, 2016
  Conference chair and chief organizer
• Annual conference of the DGKK (DKT 2016)
  University of Dresden, Mar 16-18, 2016
  (no own contribution)
• DGKK workshop on "Epitaxy of III-V Semiconductors"
  Göttingen, Dec 10-11, 2015
  Own contribution: Oral presentation about "Bulk AlN Substrates for Deep-UV Optoelectronic Applications"
• 6. International Symposium on the Growth of Nitrides (ISGN-6)
  Hamamatsu, Japan, Nov 8-12, 2015
  Own contribution: Invited talk about "Deep UV Transparent AlN Substrates with High Crystalline Perfection for Optoelectronic Devices"
  Own contribution: Poster about "Preparation of Semi-insulating and Weak n-type Conducting AlN Substrates"
  Member of the Program Committee and Session chair
• 9. International Workshop on Bulk Nitride Semiconductors (IWBNS-IX)
  Oak Valley, Wonju, South Korea, Nov 2-6, 2015
  Own contribution: Invited talk about "Tailoring Electrical and Optical Properties of AlN During Seeded AlN Bulk Growth"
  Member of the Program Committee and Session chair
• DGKK workshop on "Bulk Semiconductor Crystals"
  IKZ Berlin, Oct 7-8, 2015
  Conference chair and chief organizer
• European Materials Research Society Fall Meeting 2015 (Symposium H) (EMRS Fall 2015)
  Warsaw, Poland, Sep 15-18, 2015
  Own contribution: Invited talk about "Bulk Aluminium Nitride Substrates Tailored for Electronic Applications"
• 4. German-French Workshop on Oxide, Dielectrics and Laser Crystals (WODIL 2015)
  ISL Saint-Louis, France, Sep 10-11, 2015
  Own contribution: Oral presentation about "Preparation of Oxide, Dielectric, and Laser Crystals at the Leibniz-Institute for Crystal Growth (IKZ) Berlin"
• Annual Conference of the DGKK (DKT 2015)
  University of Frankfurt, Mar 4-6, 2015
  (no own contribution)
• 39. International Conference and Expo on Advanced Ceramics and Composites (Focus Session FS 5) (ICACC 2015)
  Daytona Beach, Florida, USA, Jan 25-30, 2015
  Own contribution: Invited talk about "Preparation and Properties of Bulk Aluminum Nitride (AlN) Crystals and Substrates"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Oct 8-9, 2014
  Own contribution: Oral presentation about "Vom AlN-Kristall zum UV-C-Laser: Erste Ergebnisse zu Wafering, Epitaxie und Bauelementherstellung auf AlN-Substraten des IKZ"
• 3. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2014)
  FEE Idar-Oberstein, Sep 11-12, 2014
  (no own contribution)
• International Workshop on Nitride Semiconductors 2014 (IWN 2014)
  Wroclaw, Poland, Aug 24-29, 2014
  Own contribution: Invited talk about "Seeded Bulk AlN Growth by the Physical Vapor Transport Method"
• 6. International Workshop on Crystal Growth Technology (IWCGT-6)
  Berlin, June 15-19, 2014
  Conference chair and chief organizer
• European Materials Research Society Spring Meeting 2014 (Symposium W) (EMRS Spring 2014)
  Lille, France, May 26-30, 2014
  Own contribution: Invited talk about "Growth of AlN Bulk Crystals for AlGaN-based Devices"
• Annual Conference of the DGKK (DKT 2014)
  Fraunhofer CSP, Halle, Mar 12-14, 2014
  (no own contribution)
• 8. International Workshop on Bulk Nitride Semiconductors (IWBNS-VIII)
  Kloster Seeon, Sep 30-Oct 5, 2013
  Own contribution: Oral presentation about "Technological Considerations for Seeded AlN Bulk Growth"
• "Berlin WideBaSe" Consortium Application Workshop
  Berlin, Sep 19-20, 2013
  Own contribution: Oral presentation about "AlN Substrates for Optoelectronic Devices"
• 10. International Conference on Nitride Semiconductors (ICNS-10)
  Washington, D.C., USA, Aug 25-30, 2013
  Own contribution: Oral presentation about "Influence of Seed Orientation on Structural and Optical Properties of Homoepitaxial Grown Bulk AlN Single Crystals"
• 19. American Conference on Crystal Growth and Epitaxy (ACCGE-19)
  Keystone, Colorado, USA, Jul 21-26, 2013
  Own contribution: Oral presentation about "Current Topics in Sublimation Growth of Bulk Aluminum Nitride (AlN)"
• Annual Conference of the DGKK (DKT 2013)
  University of Erlangen, Mar 6-8, 2013
  (no own contribution)
• DGKK workshop on "Epitaxy of III-V Semiconductors"
  Fraunhofer IISB, Erlangen, Dec 5-6, 2012
  Own contribution: Invited talk about "AlN Volumenkristallzüchtung und Verunreinigungsproblematik"
• International Workshop on Nitride Semiconductors 2012 (IWN 2012)
  Sapporo, Japan, Oct 15-19, 2012
  (no own contribution)
  Member of the Program Committee and Session chair
• 6. European Space Agency - MOD Round Table Workshop on Wide Bandgap Semiconductors and Components
  ESA/ESTEC Noordwijk, The Netherlands, Oct 8-9, 2012
  Own contribution: Poster about "Sublimation Growth of Bulk Aluminium Nitride Single Crystals With High Structural Perfection"
• 9th International Romanian Conference on Advanced Materials (ROCAM 2012)
  Brasov, Romania, Aug 27-31, 2012
  Own contribution: Invited talk about "AlN Single Crystals as Substrates for Deep-UV Optoelectronics"
• International Summer School on Crystal Growth and Photovoltaics (ISSCG 2012)
  Brasov, Romania, Aug 27-31, 2012
  Own contribution: Lecture about "Sublimation Growth of Wide Band-Gap Materials (SiC and AlN)"
• DPG Spring Meeting on Condensed Matter 2012 (DPG 2012)
  TU Berlin, Mar 26-30, 2012
  (no own contribution)
  Co-Organisator of Session HL 46: AlGaN materials for ultraviolet light emitters
• Annual Conference of the DGKK (DKT 2012)
  University of Freiberg/Saxony, Mar 7-9, 2012
  (no own contribution)
• Materials Research Society Fall Meeting 2011 (MRS Fall 2011)
  Boston, Massachusetts, USA, Nov 28-Dec 2, 2011
  (no own contribution)
• DGKK workshop on "Bulk Semiconductor Crystals"
  Fraunhofer IISB, Erlangen, Oct 5-6, 2011
  Own contribution: Oral presentation about "Herstellung und Eigenschaften von Aluminumnitrid (AlN)-Volumenkristallen und Substraten"
• 9. International Conference on Nitride Semiconductors (ICNS-9)
  Glasgow, Great Britain, July 10-15, 2011
  Own contribution: Oral presentation about "Faceting in AlN Bulk Crystal Growth and its Impact on Optical Properties"
• 5. International Workshop on Crystal Growth Technology (IWCGT-5)
  Berlin-Köpenick, Jun 26-30, 2011
  (no own contribution)
• Joint annual conference of the DGKK and the PTWK (DKT 2011)
  Slubice, Poland, Mar 14-18, 2011
  Own contribution: Oral presentation about "Faceting in AlN Bulk Crystal Growth and its Impact on Optical Properties"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Oct 6-7, 2010
  Own contribution: Oral presentation about "Punktdefekte und chemische Analyse von AlN- und AlN-SiC-Einkristallen"
• International Workshop on Nitride Seminconductors 2010 (IWN 2010)
  Tampa, Florida, USA, Sep 19-24, 2010
  Own contribution: Oral presentation about "Bulk Growth of AlN-SiC Mixed Crystals with Homogeneous Composition on Aluminum Nitride Substrates"
  Own contribution: Oral presentation about "Structural Defects in Aluminum Nitride Bulk Crystals Visualized by Cathodoluminescence Maps"
  Own contribution: Poster about "Thermally Stimulated Luminescence in Aluminium Nitride Crystals"
• Gordon Research Conference (GRC) on Defects in Semiconductors
  New London, New Hampshire, USA, Aug 8-10, 2010
  Own contribution: Invited talk about "Growth Related Defects in Bulk AlN"
• Annual Conference of the DGKK (DKT 2010)
  University of Freiburg, Mar 3-5, 2010
  (no own contribution)
• DGKK workshop on "Epitaxy of III-V Semiconductors"
  Berlin, Dec 10-11, 2009
  (no own contribution)
• 8. International Conference about Nitride Semiconductors (ICNS-8)
  Jeju, Korea, Oct 18-23, 2009
  Own contribution: Oral presentation about "Deep-UV Transparent Bulk Single-crystalline AlN Substrates"
  Own contribution: Oral presentation about "Sublimation Growth of Bulk Crystals of AlN-Rich (AlN)_x(SiC)_1-x Solid Solutions"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Oct 7-8, 2009
  (no own contribution)
• European Materials Research Society Spring Meeting 2009 (Symposium J) (EMRS Spring 2009)
  Strasbourg, France, Jun 8-12, 2009
  Own contribution: Oral presentation about "UV Transparent Single-crystalline Bulk AlN Substrates"
• Annual Conference of the DGKK (DKT 2009)
  IFW Dresden, Mar 4-6, 2009
  Own contribution: Oral presentation about "Optische Eigenschaften und Punktdefekthaushalt in einkristallinen Substraten aus Aluminiumnitrid"
• International Workshop on Nitride Seminconductors 2008 (IWN 2008)
  Montreux, Switzerland, Oct 5-10, 2008
  Own contribution: Oral presentation about "Point Defect Content and Optical Transitions in Bulk Aluminum Nitride Crystals"
  Own contribution: Oral presentation about "Self-Compensation of Shallow Donors in AlN: High-Frequency EPR and ENDOR Studies"
• International Materials Forum 2008 - Frontiers in Materials Science and Technology
  Bayreuth, Aug 4-5, 2008
  (no own contribution)
• Annual Conference of the DGKK (DKT 2008)
  University of Munich, Mar 5-7, 2008
  (no own contribution)
• 7. International Conference on Nitride Semiconductors (ICNS-7)
  Las Vegas, Nevada, USA, Sep 16-21, 2007
  Own contribution: Poster about "Structural Properties of Aluminum Nitride Bulk Single Crystals Grown by PVT"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Sep 12-13, 2007
  Own contribution: Oral presentation about "Aktueller Stand der AlN-Kristallzüchtung in Erlangen und Strukturelle Eigenschaften der AlN-Volumeneinkristalle"
• European Materials Research Society Spring Meeting 2007 (Symposium G) (EMRS Spring 2007)
  Strasbourg, France, May 27-Jun 1, 2007
  Own contribution: Oral presentation about "Structural Properties and Defect-Selective Etching of Aluminum Nitride Substrates"
• International Workshop on Nitride Seminconductors 2006 (IWN 2006)
  Kyoto, Japan, Oct 22-27, 2006
  Own contribution: Poster about "Defect-Selective Etching of Aluminum Nitride Single Crystals"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Oct 11-12, 2006
  (no own contribution)
• European Materials Research Society Spring Meeting 2006 (Symposium S) (EMRS Spring 2006)
  Nice, France, May 28-Jun 2, 2006
  Own contribution: Oral presentation about "Properties of Al-Polar PVT Grown Single-crystalline Aluminum Nitride"
• DGKK workshop on "Bulk Semiconductor Crystals"
  University of Freiberg/Saxony, Oct 5-6, 2005
  Own contribution: Oral presentation about "AlN-Volumenkristallzüchtung - Aktueller Stand und offene Fragen"
• 6. International Conference on Nitride Semiconductors (ICNS-6)
  Bremen, Aug 28-Sep 2, 2005
  Own contribution: Poster about "Orientation-dependent Properties of Aluminum Nitride Single Crystals"
• DGKK workshop on "Bulk Semiconductor Crystals"
  Fraunhofer IISB, Erlangen, Apr 6-7, 2005
  Own contribution: Oral presentation about "Charakterisierung von freistehenden AlN-Einkristallen"
• DGKK workshop on "III-V Semiconductors and SiC"
  University of Freiberg/Saxony, Oct 6-7, 2004
  Own contribution: Oral presentation about "Aktueller Stand bei der Herstellung von AlN-Volumeneinkristallen"
• 14. International Conference on Crystal Growth (ICCG-14)
  Grenoble, France, Aug 9-13, 2004
  Own contribution: Oral presentation about "Structural Properties of AlN Crystals Grown by Physical Vapor Transport"
• International Workshop on Nitride Seminconductors 2004 (IWN 2004)
  Pittsburgh, Pennsylvania, USA, Jul 19-23, 2004
  Own contribution: Oral presentation about "Comparative Study of the Initial Growth Stage in PVT Growth of AlN on SiC and on Native AlN Substrates"
  Own contribution: Poster about "Structural Properties of AlN Crystals Grown by Physical Vapor Transport"
• 7. Expert Evaluation and Control of Compound Semiconductor Materials and Technologies (EXMATEC 2004)
  Montpellier, France, Jun 2-5, 2004
  Own contribution: Oral presentation about "Growth and Characterization of Bulk AlN Substrates Grown by PVT"
• Joint Annual Conference of the DGKK and the DGK (DKT 2004)
  Jena, Mar 15-19, 2004
  Own contribution: Oral presentation about "Strukturelle Eigenschaften von sublimationsgezüchteten AlN-Kristallen"
• DGKK workshop on "III-V Semiconductors and SiC"
  University of Freiberg/Saxony, Oct 16-17, 2003
  Own contribution: Oral presentation about "Strukturelle, elektrische und optische Eigenschaften von AlN-Volumenkristallen"
• 10. International Conference on Silicon Carbide and Related Materials 2003 (ICSCRM 2003)
  Lyon, France, Oct 5-10, 2003
  Own contribution: Poster about "Structural, Optical, and Electrical Properties of Bulk AlN Crystals Grown by PVT"
  Own contribution: Poster about "Analysis of Different Vanadium Charge States in Vanadium Doped 6H-SiC by Low Temperature Optical Absorption and Electron Paramagnetic Resonance"
• 15. American Conference on Crystal Growth and Epitaxy (ACCGE-15)
  Keystone, Colorado, USA, Jul 20-24, 2003
  Own contribution: Oral presentation about "Oxygen in PVT Growth of Bulk AlN: Influence on Growth Process and Crystal Properties"
• 5. International Conference on Nitride Semiconductors (ICNS-5)
  Nara, Japan, May 25-30, 2003
  Own contribution: Oral presentation about "PVT Growth of Bulk AlN Crystals with Low Oxygen Contamination"
• 2nd French-German Crystal Growth Meeting (DKT 2003)
  Nancy, France, Mar 10-13, 2003
  Own contribution: Poster about "Oxygen in PVT Growth of Bulk AlN: Influence on Growth Process and Crystal Properties"
• European Conference on Silicon Carbide and Related Materials 2002 (ECSCRM 2002)
  Linköping, Sweden, Sep 1-5, 2002
  Own contribution: Poster about "Electrical and Optical Characterization of p-Type Boron Doped 6H-SiC Bulk Crystals"
  Own contribution: Poster about "Preparation of Semi-Insulating Silicon Carbide by Vanadium Doping During PVT Bulk Crystal Growth"
• International Workshop on Nitride Semiconductors 2002 (IWN 2002)
  Aachen, Jul 22-25, 2002
  (no own contribution)
• 9. International Conference on Silicon Carbide and Related Materials 2001 (ICSCRM 2001)
  Tsukuba, Japan, Oct 28-Nov 2, 2001
  Own contribution: Oral presentation about "Sublimation Growth of Bulk AlN Crystals: Materials Compatibility and Crystal Quality"
  Own contribution: Oral presentation about "On the Preparation of Vanadium-Doped Semi-insulating SiC Bulk Crystals"
  Own contribution: Poster about "Incorporation of Boron and the Role of Nitrogen as a Compensation Source in SiC Bulk Crystal Growth"
• European Materials Research Society Spring Meeting 2001 (Symposium F) (EMRS Spring 2001)
  Strasbourg, France, Jun 5-8, 2001
  Own contribution: Poster about "On the Preparation of Semi-Insulating SiC Bulk Crystals by the PVT Technique"
• DGKK workshop on "III-V Semiconductors and SiC"
  IKZ Berlin, Mar 20-21, 2001
  Own contribution: Oral presentation about "Herstellung von semiisolierenden SiC-Kristallen mit dem PVT-Verfahren"
• European Conference on Silicon Carbide and Related Materials 2000 (ECSCRM 2000)
  Kloster Banz, Sep 3-7, 2000
  Own contribution: Poster about "Study of Boron Incorporation During PVT Growth of p-type SiC Crystals"
• DPG Spring Meeting on Condensed Matter 2000 (DPG 2000)
  University of Regensburg, Mar 27-31, 2000
  (no own contribution)
• 30. Annual Conference of the DGKK (DKT 2000)
  University of Erlangen, Mar 20-22, 2000
  (no own contribution)
  Member of the Local Organization Committee (Chair: Prof. G. Müller)

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