Ultrawide Bandgap Laser Addressable Photoconductors

Executive Summary

We will develop, synthesize, and characterize custom, ultrawide-bandgap photoconducting materials for use in next-generation, high-power and high-speed devices. The new materials will enable increased fluence and repetition of high-energy laser systems, increased power density and frequencies in radio-frequency generation, and improved performance of power electronics in the electrical grid infrastructure.

Publications, Presentations, and Patents

Jesenovec, J. et al. 2022. "Persistent Room-Temperature Photodarkening in Cu-Doped β-Ga2O3." Phys Rev Lett 128, 077402 (2022).

Wickramaratne, D., Varley, J. B. & Lyons, J. L. 2022. "Donor Doping of Corundum (AlxGa1−x)2O3." Appl Phys Lett 121, 042110 (2022).

Mu, S. et al. 2022. "Role of Carbon and Hydrogen in Limiting n-type Doping of Monoclinic (AlxGa1−x)2O3." Phys Rev B 105, 155201 (2022).

Ratcliff, L. E. et al. 2022. "Tackling Disorder in γ‐Ga2O3." Adv Mater 2204217 (2022).

Mukhopadhyay, P. et al. "Role of Defects in Ultra-High Gain in Fast Planar Tin Gallium Oxide UV-C Photodetector by MBE." Appl Phys Lett 121, 111105 (2022).

Langørgen, A. et al. 2022. "Influence of Heat Treatments in H 2 and Ar on the E1 Center in β-Ga2O3." J Appl Phys 131, 115702 (2022).

Voss, L. "Solid State Switches." Directed Energy Professionals Society. La Jolla, CA. Sep-22, 2022.

Varley, J. "Atomistic Simulations of Point Defects in Semiconductors." Physics Colloquium, Ohio State University. Virtual. February, 2022.

Varley, J. "Assessing the Behavior of Dopants and Impurities in Ga2O3 and Related Alloys Through Atomistic Simulations." Compound Semiconductor Week. Ann Arbor, MI. June 22, 2022.

McCluskey, M. "Photoluminescence Mapping of Light-Emitting Devices and Materials." International Symposium for Luminescent Materials. Virtual. July 22, 2022.

McCluskey, M. "Using Light to Change Hydrogen-Related Defects in Oxide Semiconductors." Gordon Research Conference on Defects in Semiconductors. New London, NH. August 22, 2022.

Varley, J. "Understanding Point Defects and Impurities in Ga2O3 and (Al,Ga)2O3 through Atomistic Simulations." International Workshop on Gallium Oxide and Related Materials (IWGO). Nagano, Japan. October 2022.

Rushford, M. "Twister Oven: Increases Light Absorption." ROI Accepted. September 13, 2022. IL-13787.

Shao, Qinghui. "High Voltage and High Power Diamond JFET Switch with Photo-Controlled Gate." ROI Accepted. August 19, 2022. IL-13772.

Frye, C. "Diffused Beta-Ga2O3 Photoconductive Devices." ROI Accepted August 19, 2022. IL-13771.

Voss, L. "Reliable and Efficient Diamond Photoconductive Switches." ROI Accepted. August 16, 2022. IL-13770.

Voss, L. "Ultra Wide Band Gap Optically Addressable Light Valves." ROI Accepted. September 8, 2021. IL-13698.