Dr. Christopher E. Valdivia Profile

Dr. Christopher E. Valdivia

Senior Research Scientist at Univ of Ottawa

SPIE Involvement:

Author

Publications (21)

Proceedings Article | 9 March 2024 Presentation

Presentation

Using machine learning to optimize multi-junction photonic power converters

Robert F. H. Hunter, Gavin P. Forcade, Yuri Grinberg, Meghan Beattie, D. Paige Wilson, Christopher Valdivia, Mathieu de Lafontaine, Louis-Philippe St-Arnaud, Henning Helmers, Oliver Höhn, David Lackner, Carmine Pellegrino, Jacob Krich, Alexandre Walker, Karin Hinzer

Proceedings Volume PC12881, PC1288109 (2024) https://doi.org/10.1117/12.3002658

KEYWORDS: Machine learning, Design and modelling, Pattern recognition, Optoelectronic devices, Telecommunications, Standards development, Receivers, Principal component analysis, Photovoltaics, Performance modeling

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Proceedings Article | 20 March 2023 Presentation

Presentation

Investigating the effect of energy level spacing and inhomogeneous broadening on performance of quantum dash ridge-wavelengths lasers at elevated temperatures

Sebastian Schaefer, Ras-Jeevan Obhi, Christopher Valdivia, Philip Poole, Pedro Barrios, Jiaren Liu, Zhenguo Lu, Karin Hinzer

Proceedings Volume PC12415, PC1241502 (2023) https://doi.org/10.1117/12.2650505

KEYWORDS: Optical simulations, Device simulation, Computer simulations, 3D modeling, Photonic integrated circuits, Optoelectronics, Laser development, Integrated optics, Instrument modeling, Electron transport

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Proceedings Article | 10 March 2023 Presentation

Presentation

Strategies for high-performance O-band photonic power converters (Conference Presentation)

Karin Hinzer, Meghan Beattie, Neda Nouri, Henning Helmers, Gavin Forcade, Christopher Valdivia, Oliver Höhn, Jacob Krich

Proceedings Volume PC12416, PC1241609 (2023) https://doi.org/10.1117/12.2653280

KEYWORDS: Reflectors, Telecommunications, Particle swarm optimization, Indium gallium arsenide, Gallium arsenide, Finite-difference time-domain method, Circuit switching

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Proceedings Article | 10 March 2023 Presentation

Presentation

Impact of spectral versus broadband albedo on bifacial silicon heterojunction photovoltaic devices across North America (Conference Presentation)

Erin Tonita, Christopher Valdivia, Annie C. Russell, Karin Hinzer

Proceedings Volume PC12416, PC124160G (2023) https://doi.org/10.1117/12.2650155

KEYWORDS: Photovoltaics, Silicon, Solar energy, Heterojunctions, Solar cells, Tandem solar cells, Crystals, Amorphous silicon

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Proceedings Article | 4 March 2022 Presentation + Paper

Presentation + Paper

Impact of reflective torque tube on rear side irradiance in bifacial photovoltaic modules

Trevor Coathup, Mandy Lewis, Annie C. Russell, Alejandro Conesa, Javier Guerrero-Perez, Christopher Validivia, Karin Hinzer

Proceedings Volume 11996, 119960A (2022) https://doi.org/10.1117/12.2615658

KEYWORDS: Reflectivity, Systems modeling, Solar cells, Solar energy, Photovoltaics, Ray tracing, Performance modeling, Sun, Renewable energy

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Proceedings Article | 5 March 2021 Presentation + Paper

Presentation + Paper

Development of dual junction GaInP/GaAs solar cells for high-performance concentrator photovoltaic quad-junction III-V/IV

A. Poungoué Mbeunmi, A. Turala, R. Arvinte, C. Validiva, K. Hinzer, V. Aimez, R. Arès, A. Boucherif, S. Fafard

Proceedings Volume 11681, 116810C (2021) https://doi.org/10.1117/12.2578808

KEYWORDS: Solar cells, Solar concentrators, Photovoltaics, Heterojunctions, Calibration, Absorption

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Proceedings Article | 5 March 2021 Presentation

Presentation

Impact of Spectral Correction on Bifacial Silicon Heterojunction Module Energy Yield in High Latitude Locations

Mandy Lewis, Annie C. Russell, Christopher Valdivia, Joan Haysom, Mariana Bertoni, Karin Hinzer

Proceedings Volume 11681, 116810R (2021) https://doi.org/10.1117/12.2578783

KEYWORDS: Solar energy, Silicon, Heterojunctions, Solar cells, Ultraviolet radiation, Quantum efficiency, Photovoltaics, Absorption

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Proceedings Article | 5 March 2021 Presentation

Presentation

Ultrathin monochromatic photonic power converters with nanostructured back mirror for light trapping of 1310-nm laser illumination

Neda Nouri, Christopher Valdivia, Meghan Beattie, Marziyeh Zamiri, Jacob Krich, Karin Hinzer

Proceedings Volume 11681, 116810X (2021) https://doi.org/10.1117/12.2584689

KEYWORDS: Nanostructuring, Mirrors, Absorption, Optical simulations, Telecommunications, Target designation, Statistical modeling, Refractive index, Reflectors, Molecular beam epitaxy

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Proceedings Article | 10 March 2020 Presentation

Presentation

Impact of bifacial photovoltaic cell characteristics on module energy yield in high-latitude locations (Conference Presentation)

Mandy Lewis, Annie C. Russell, Erin Tonita, Christopher Valdivia, Joan Haysom, Mariana Bertoni, Karin Hinzer

Proceedings Volume 11275, 112750W (2020) https://doi.org/10.1117/12.2546583

KEYWORDS: Solar energy, Solar cells, MATLAB, Silicon, Heterojunctions, Photovoltaics, Computer simulations, Absorption, Ultraviolet radiation, Reflectivity

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Proceedings Article | 27 February 2019 Presentation + Paper

Presentation + Paper

A porous Ge/Si interface layer for defect-free III-V multi-junction solar cells on silicon

Youcef Bioud, Meghan Beattie, Abderraouf Boucherif, Mourad Jellit, Romain Stricher, Serge Ecoffey, Gilles Patriarche, David Troadec, Ali Soltani, Nadi Braidy, Matthew Wilkins, Christopher Valdivia, Karin Hinzer, Dominique Drouin, Richard Arès

Proceedings Volume 10913, 109130T (2019) https://doi.org/10.1117/12.2511080

KEYWORDS: Silicon, Germanium, Interfaces, Multijunction solar cells, Photovoltaics, Electrochemical etching, Transmission electron microscopy, Chemical mechanical planarization, Solar cells

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Proceedings Article | 19 April 2017 Presentation

Presentation

20-junction photonic power converter performance under non-uniform illumination calculated by 3D distributed circuit model (Conference Presentation)

Sanmeet Chahal, Mathew Wilkins, Denis Masson, Simon Fafard, Christopher Valdivia, Karin Hinzer

Proceedings Volume 10099, 1009908 (2017) https://doi.org/10.1117/12.2252919

KEYWORDS: Mathematical modeling, Resistors, 3D modeling, Circuit switching, Photovoltaics, Instrument modeling, Performance modeling, Computer simulations, Solar cells, Optimization (mathematics)

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SPIE Journal Paper | 7 April 2017

Design of thin InGaAsN(Sb) n-i-p junctions for use in four-junction concentrating photovoltaic devices

Matthew Wilkins, James Gupta, Abdelatif Jaouad, Boussairi Bouzazi, Simon Fafard, Abderraouf Boucherif, Christopher Valdivia, Richard Arès, Vincent Aimez, Henry Schriemer, Karin Hinzer

JPE, Vol. 7, Issue 02, 022502, (April 2017) https://doi.org/10.1117/12.10.1117/1.JPE.7.022502

KEYWORDS: Sun, Gallium arsenide, Doping, Diffusion, Germanium, Resistance, Solar concentrators, Solar cells, Semiconducting wafers, Annealing

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Proceedings Article | 14 March 2016 Paper

Paper

Advances with vertical epitaxial heterostructure architecture (VEHSA) phototransducers for optical to electrical power conversion efficiencies exceeding 50 percent

S. Fafard, F. Proulx, M. C. A. York, M. Wilkins, C. Valdivia, M. Bajcsy, D. Ban, A. Jaouad, B. Bouzazi, R. Arès, V. Aimez, K. Hinzer, D. Masson

Proceedings Volume 9743, 974304 (2016) https://doi.org/10.1117/12.2218486

KEYWORDS: Heterojunctions, Measurement devices, Temperature metrology, Quantum efficiency, Diodes, External quantum efficiency, Gallium arsenide, Absorption, Semiconductor lasers, Platinum

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Proceedings Article | 14 March 2016 Paper

Paper

Performance impact of luminescent coupling on monolithic 12-junction phototransducers for 12 V photonic power systems

Matthew Wilkins, Christopher Valdivia, Sanmeet Chahal, Masanori Ishigaki, Denis Masson, Simon Fafard, Karin Hinzer

Proceedings Volume 9743, 97430W (2016) https://doi.org/10.1117/12.2213727

KEYWORDS: Photovoltaics, Gallium arsenide, Manufacturing, Quantum efficiency, Multijunction solar cells, Heterojunctions, Photonic devices, Indium gallium phosphide, Physics, Silicon carbide, Field effect transistors, Diodes

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Proceedings Article | 16 March 2015 Paper

Paper

Five-volt vertically-stacked, single-cell GaAs photonic power converter

Christopher Valdivia, Matthew Wilkins, Boussairi Bouzazi, Abdelatif Jaouad, Vincent Aimez, Richard Arès, Denis Masson, Simon Fafard, Karin Hinzer

Proceedings Volume 9358, 93580E (2015) https://doi.org/10.1117/12.2079824

KEYWORDS: External quantum efficiency, Gallium arsenide, Sensors, Absorption, Photons, Optical simulations, Image segmentation, Photovoltaics, Device simulation, Quantum efficiency

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Proceedings Article | 23 September 2010 Paper

Paper

High-efficiency commercial grade 1cm2 AlGaInP/GaAs/Ge solar cells with embedded InAs quantum dots for concentrator demonstration system

J. Wheeldon, C. Valdivia, D. Masson, F. Proulx, B. Riel, N. Puetz, E. Desfonds, S. Fafard, B. Rioux, A. SpringThorpe, R. Arès, V. Aimez, M. Armstrong, M. Swinton, J. Cook, F. Shepherd, T. Hall, K. Hinzer

Proceedings Volume 7750, 77502Q (2010) https://doi.org/10.1117/12.872890

KEYWORDS: Solar cells, Solar energy, Solar concentrators, Quantum dots, Quantum efficiency, Reliability, Absorption, Sun, Indium arsenide, Resistance

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Proceedings Article | 23 September 2010 Paper

Paper

Time-dependent analysis of AlGaAs/AlGaAs tunnel junctions for high efficiency multi-junction solar cells

Gitanjali Kolhatkar, Jeffrey Wheeldon, Christopher Valdivia, Alexandre Walker, Simon Fafard, Artur Turala, Abdelatif Jaouad, Richard Arès, Vincent Aimez, Karin Hinzer

Proceedings Volume 7750, 77502S (2010) https://doi.org/10.1117/12.872886

KEYWORDS: Resistance, Solar cells, Oscilloscopes, Multijunction solar cells, Time metrology, Doping, Remote sensing, Power supplies, Calibration, Germanium

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Proceedings Article | 23 September 2010 Paper

Paper

Simulation, modeling, and comparison of III-V tunnel junction designs for high efficiency metamorphic multi-junction solar cells

Alexandre Walker, Jeffrey Wheeldon, Christopher Valdivia, Gitanjali Kolhatkar, Karin Hinzer

Proceedings Volume 7750, 77502X (2010) https://doi.org/10.1117/12.872882

KEYWORDS: Solar cells, Solar energy, Doping, Device simulation, Multijunction solar cells, Resistance, Gallium arsenide, Gallium, Heterojunctions, Aluminum

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Proceedings Article | 23 September 2010 Paper

Paper

Study of InGaAs/GaAs quantum dot saturation level for the design of concentrated multi-junction solar cells

Olivier Thériault, Anthony SpringThorpe, Jeffrey Wheeldon, Christopher Valdivia, Alexandre Walker, Bruno Riel, Karin Hinzer

Proceedings Volume 7750, 77502T (2010) https://doi.org/10.1117/12.872892

KEYWORDS: Quantum dots, Absorption, Gallium arsenide, Solar energy, Sun, Indium arsenide, Luminescence, Multijunction solar cells, Solar cells, Spherical lenses

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Proceedings Article | 23 September 2010 Paper

Paper

Thermal test and simulation of alumina receiver with high efficiency multi-junction solar cell for concentrator systems

Simon Chow, Christopher Valdivia, Jeffrey Wheeldon, Richard Ares, Osvaldo Jesus Arenas, Vincent Aimez, David McMeekin, Simon Fafard, Karin Hinzer

Proceedings Volume 7750, 775035 (2010) https://doi.org/10.1117/12.872894

KEYWORDS: Solar cells, Receivers, Sun, Solar concentrators, Multijunction solar cells, Calibration, Temperature metrology, Computer simulations, Copper, Device simulation

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Proceedings Article | 12 August 2008 Paper

Paper

Optimization of antireflection coating design for multijunction solar cells and concentrator systems

Christopher Valdivia, Eric Desfonds, Denis Masson, Simon Fafard, Andrew Carlson, John Cook, Trevor Hall, Karin Hinzer

Proceedings Volume 7099, 709915 (2008) https://doi.org/10.1117/12.807675

KEYWORDS: Solar cells, Antireflective coatings, Coating, Refractive index, Silicon, Solar concentrators, Absorption, Photovoltaics, Multijunction solar cells, Ultraviolet radiation

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Showing 5 of 21 publications

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