Dr. Joel B. Varley Profile

Dr. Joel B. Varley

at Lawrence Livermore National Lab

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 18 December 2024 Presentation + Paper

Photoluminescence mapping of laser-damaged β-Ga2O3

Matthew McCluskey, Jesse Huso, John McCloy, Arkka Bhattacharyya, Sriram Krishnamoorthy, Clint Frye, Joel Varley, Lars Voss

Proceedings Volume 13190, 131900A (2024) https://doi.org/10.1117/12.3032501

KEYWORDS: Raman spectroscopy, Photoluminescence, Silicon, Ultraviolet radiation, Spectroscopy, Visible radiation, Solar energy, Microscopes, Beam diameter, Semiconductors

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Proceedings Article | 16 March 2024 Presentation

First-principles simulations of vacancy-related complexes in Ga2O3 and related alloys

Joel Varley

Proceedings Volume PC12887, PC1288707 (2024) https://doi.org/10.1117/12.3023620

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Proceedings Article | 12 March 2024 Presentation + Paper

Aging mechanisms of broad area high-power ~800nm laser diodes

E. McVay, R. Deri, J. Li, S. Baxamusa, W. Fenwick, M. Boisselle, D. Mittelberger, J. Varley, R. Swertfeger, L. Gilmore, M. Crowley, P. Thiagarajan, J. Song, G. Thaler, C. Schuck, A. Dusty

Proceedings Volume 12867, 128670E (2024) https://doi.org/10.1117/12.2691022

KEYWORDS: Oxygen, Waveguides, Quantum devices, Quantum wells, Semiconductor lasers, Absorption, Quantum simulation, Quantum experiments, Independent component analysis, Quantum emitters

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Proceedings Article | 16 March 2023 Presentation

First-principles simulations of transition metal dopants and impurities in in Ga2O3 and related alloys (Conference Presentation)

Joel Varley

Proceedings Volume PC12422, PC1242206 (2023) https://doi.org/10.1117/12.2660843

KEYWORDS: Transition metals, Electronics, Semiconductors, Iron, Crystals, Renewable energy, Oxides, Manufacturing, Gallium, Energy efficiency

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Proceedings Article | 16 March 2023 Presentation + Paper

Polarization and orientation dependent optical properties in Czochralski-grown transition metal doped β-Ga2O3

Benjamin Dutton, Cassandra Remple, Jani Jesenovec, Soroush Ghandiparsi, Miranda Gottlieb, Joel Varley, Lars Voss, Matthew McCluskey, John McCloy

Proceedings Volume 12422, 1242205 (2023) https://doi.org/10.1117/12.2650406

KEYWORDS: Manganese, Crystals, Transition metals, Absorption, Ions, Polarization, Chromium, Ruby, Light absorption, Polarized light, Gallium oxide

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Proceedings Article | 5 March 2021 Presentation

Band alignments and doping strategies in orthorhombic and monoclinic AlGO alloys

John Lyons, Darshana Wickramaratne, Joel Varley

Proceedings Volume 11687, 116870R (2021) https://doi.org/10.1117/12.2588842

KEYWORDS: Tin, Silicon, Oxygen, Germanium, Doping, Aluminum

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Proceedings Article | 10 March 2020 Presentation

Atomic scale microscopy of point defects and their complexes in beta-Ga2O3 (Conference Presentation)

Jinwoo Hwang, Jared Johnson, Joel Varley, Aaron Arehart, Steven Ringel, Chris Van de Walle

Proceedings Volume 11281, 1128108 (2020) https://doi.org/10.1117/12.2552248

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Proceedings Article | 23 February 2018 Paper

First-principles calculations of optical transitions at native defects and impurities in ZnO

John Lyons, Joel Varley, Anderson Janotti, Chris Van de Walle

Proceedings Volume 10533, 105331O (2018) https://doi.org/10.1117/12.2303687

KEYWORDS: Zinc oxide, Luminescence, Copper, Hydrogen, Materials science

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Proceedings Article | 11 October 2017 Presentation

Crystal growth of CdZnTeSe (CZTS) gamma detectors: a promising alternative to CdZnTe (Conference Presentation)

Utpal Roy, Giuseppe Camarda, Yonggang Cui, Rubi Gul, Ge Yang, Anwar Hossain, Ralph James, Jakub Zazvorka, Václav Dedic, Jan Franc, Vincenzo Lordi, Joel Varley

Proceedings Volume 10392, 103920Y (2017) https://doi.org/10.1117/12.2276955

KEYWORDS: Sensors, Crystals, Selenium, Tellurium, Sensor performance, Semiconductors, Scintillators

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Proceedings Article | 2 November 2016 Presentation

Design of optimal buffer layers for CuInGaSe2 thin-film solar cells (Conference Presentation)

Vincenzo Lordi, Joel Varley, Xiaoqing He, Angus Rockett, Jeff Bailey, Geordie Zapalac, Neil Mackie, Dmitry Poplavskyy, Atiye Bayman

Proceedings Volume 9936, 993609 (2016) https://doi.org/10.1117/12.2237243

KEYWORDS: Interfaces, Copper indium gallium selenide, Crystals, Thin films, Process control, Thin film solar cells, Manufacturing, Thin film manufacturing, Thin film devices, Control systems

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Proceedings Article | 5 October 2015 Presentation

Cd-Zn-O-S alloys for optimal buffer layers in thin-film photovoltaics (Presentation Recording)

Joel Varley, Xiaoqing He, Neil Mackie, Angus Rockett, Vincenzo Lordi

Proceedings Volume 9561, 95610A (2015) https://doi.org/10.1117/12.2188373

KEYWORDS: Cadmium sulfide, Thin films, Thin film solar cells, Photovoltaics, Solar energy, Renewable energy, Solar cells, Cadmium, Zinc, Absorption

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Proceedings Article | 16 September 2013 Paper

Conductivity and transparency of TiO2 from first principles

André Schleife, Joel Varley, Anderson Janotti, Chris Van de Walle

Proceedings Volume 8822, 882205 (2013) https://doi.org/10.1117/12.2024566

KEYWORDS: Absorption, Polarons, Visible radiation, Doping, Chemical species, Reflectivity, Dielectrics, Transparency, Optical properties, Titanium dioxide

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Showing 5 of 12 publications

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