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Meeting MS&T21: Materials Science & Technology
Symposium Late News Poster Session
Presentation Title P1-17: Hydrogen Induced Photodarkening of Cu-doped B-Ga2O3 Czochralski Single Crystals
Author(s) Jani Jesenovec, Christopher Pansegrau, Cassandra Remple, Jesse Huso, Matthew McCluskey, John McCloy
On-Site Speaker (Planned) Jani Jesenovec
Abstract Scope B-Ga2O3 demonstrates insulating properties with Mg, Fe, and Zn doping. Here we investigate Cu doping (0.25 at.%) in bulk Czochralski (CZ) and vertical gradient freeze (VGF) B-Ga2O3, with significant Cu incorporation, even with expected Cu evaporation. Representative crystals were assessed for orientation, purity, and electrical properties. The solubility and electronic behavior of Cu dopants are consistent with measured concentrations 11018 - 11019 atoms/cm3 and electrical measurements show resistivity 109-1010 Ω∙cm, with no p-type conduction. Segregation and precipitation of Cu species in the VGF material were studied with Raman spectroscopy, photoluminescence microscopy, and energy-dispersive X-ray spectroscopy. With sufficient Cu concentration, B-Ga2O3 crystals excited with ultraviolet (UV) light photodarken rapidly and exhibit decreased resistivity. This darkened state remains at room temperature for several days before decaying. The origin of photodarkening was studied with infrared spectroscopy and shown to be related to the appearance of hydrogen-containing vibrations which were not present before darkening.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Extrinsic Size Effects on Fracture Behaviour of Copper
Fabrication of Doped β-tricalcium Phosphate Bioceramics by Robocasting for Bone Repair Applications
Hybrid Additive/Subtractive System of Ceramic Materials: Investigation of Powder, Process and Innovative Post-treatments
LSTM Model to Predict Low-cycle Fatigue in IN718
Microstructural Conditioning to Reveal Prior Austenitic Grain Using the Oxidation Method
Nanoindentation Studies on Friction Stir Processed Dual Phase High Entropy Alloy
P1-17: Hydrogen Induced Photodarkening of Cu-doped B-Ga2O3 Czochralski Single Crystals
P1-27: Polyurea Tensile Tests at High Strain Rates
P1-34: Resilient SiOC/Epoxy Nanocomposites
P1-35: Spectroscopic Studies of Nd3+ Doped KY3F10 Nanoparticles
P1-5: Oxidation Protection of AlN/BN via Al18B4O33
P1-6: Luminescence Thermometry – a Fad or a Challenge?
P1-7: Preparation and Structural Evolution of Si(O)CN Fibers Prepared via Hand Spinning of a Modified Silazane Oligomer
P2-10: Correlation between Shear Strength and PU Foam Density with Respect to Aging Time in District Heating Pipe
P2-29: Porous Metal Micro-pillars by Thermomechanical Molding
P2-9: Computational Fluid Dynamics Modeling of Enhanced Convective Heat Transfer Using Twisted Tape Insert
P3-10: Additively Manufactured 718 Ni Alloys with Oxide Nanoparticles
P3-11: CALPHAD-based Alloy Design and Uncertainty Quantification for Additive Manufacturing
P3-13: Effect of Heat Treatment on Microstructure and Corrosion Behavior of Additively Manufactured 7050 Aluminum Alloy
P3-26: Introducing Heusler Fe2SiTi Intermetallic as a New Strengthening Precipitate for High Strength Low Alloy Steels
P3-27: Understanding the Load Response Behavior of Martensite, Bainite and Accompanied Retained Austenite in a High Carbon Bearing Steel
P3-28: Fatigue Analysis of a Spring Coil Structure under Cyclic Loading Conditions
P3-29: Finite Element Modeling of Sheet Metal Bending Process
P3-30: Grain Size-texture Coupling in Crystal Plasticity Finite Element Modeling : Application to Magnesium Alloys
P3-31: Reactive Phase Formation: Kinetics and Associated Microstructure Evolution
P3-32: Understanding Mechanical Behavior of Basketball Hoops Using Finite Element Modeling
Scanning Strategies Investigation for Powder Bed Selective Laser Processing of Alumina
Texture Evolution during the High Temperature Heat Treatment of Additively Manufactured IN718

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