Prof. Yoshitaka Okada Profile

Prof. Yoshitaka Okada

Prof. at Univ of Tokyo

SPIE Involvement:

Author

Publications (28)

Proceedings Article | 9 March 2024 Presentation

Presentation

Bandgap tunable and solution process compatible solar cells for multi-junction photovoltaics

Takaya Kubo, Fumiyasu Awai, Haibin Wang, Yusuke Oteki, Takashi Koida, Maxime Giteau, Stéphane Collin, Jean-François Guillemoles, Yoshitaka Okada, Hiroshi Segawa

Proceedings Volume PC12881, PC1288106 (2024) https://doi.org/10.1117/12.3002344

KEYWORDS: Solar cells, Perovskite, Quantum processes, Infrared radiation, Gallium arsenide, Photovoltaics, Lead, Iodine, Tandem solar cells, Optical simulations

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SPIE Journal Paper | 30 January 2024

Luminescent coupling effect in InGaP/GaAs/InGaAs inverted metamorphic triple-junction solar cell

Vaishnavi Thakur, Bernice Mae Yu Jeco-Espaldon, Yoshitaka Okada

JPE, Vol. 14, Issue 01, 015503, (January 2024) https://doi.org/10.1117/12.10.1117/1.JPE.14.015503

KEYWORDS: Light emitting diodes, Sun, Solar cells, Photocurrent, External quantum efficiency, Photons, Indium gallium arsenide, Gallium arsenide, Diodes, Resistance

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SPIE Journal Paper | 8 August 2022

Collection of photocarriers in intermediate band solar cells: experiments and equivalent circuit analysis

Nazmul Ahsan, Naoya Miyashita, Kin Man Yu, Wladek Walukiewicz, Yoshitaka Okada

JPE, Vol. 12, Issue 03, 032210, (August 2022) https://doi.org/10.1117/12.10.1117/1.JPE.12.032210

KEYWORDS: Solar cells, External quantum efficiency, Antimony, Nitrogen, Gallium, Diodes, Absorption, Gallium arsenide, Indium, Sun

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SPIE Journal Paper | 29 March 2022

Resonant absorption for multilayer quantum well and quantum dot solar cells

Maxime Giteau, Yusuke Oteki, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, Yoshitaka Okada

JPE, Vol. 12, Issue 02, 022203, (March 2022) https://doi.org/10.1117/12.10.1117/1.JPE.12.022203

KEYWORDS: Absorption, Solar cells, Quantum wells, Quantum dots, Gallium arsenide, Resonance enhancement, Mirrors, Silver, Reflection, Indium arsenide

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Proceedings Article | 1 August 2021 Presentation

Presentation

Optimizing the vertical position of quantum dots and wells to maximize light absorption

Maxime Giteau, Yusuke Oteki, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, Yoshitaka Okada

Proceedings Volume 11824, 1182406 (2021) https://doi.org/10.1117/12.2593862

KEYWORDS: Absorption, Quantum dots, Solar cells, Quantum wells, Nanostructures, Photovoltaics, Nanolithography, Indium arsenide, Gallium arsenide, Fabry–Perot interferometers

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Proceedings Article | 5 March 2021 Presentation

Presentation

Understanding the cooling mechanisms of hot carriers in ultrathin GaAs layers

Maxime Giteau, Cyprien Drommi, François Challet, Hassanet Sodabanlu, Hamidreza Esmaielpour, Marc Bescond, Daniel Suchet, Stéphane Collin, Jean-François Guillemoles, Yoshitaka Okada

Proceedings Volume 11681, 116810O (2021) https://doi.org/10.1117/12.2578992

KEYWORDS: Solar cells, Thermal modeling, Temperature metrology, Spectroscopy, Photovoltaics, Phonons, Numerical simulations, Luminescence, Gallium arsenide

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SPIE Journal Paper | 16 October 2020 Open Access

Open Access

Application of perovskite quantum dots in carrier redistribution in III-V multijunction solar cells with luminescent coupling effect

Bernice Mae Yu Jeco-Espaldon, Haibin Wang, Achilles Espaldon, Takaya Kubo, Hiroshi Segawa, Nazmul Ahsan, Yoshitaka Okada

JPE, Vol. 10, Issue 04, 042005, (October 2020) https://doi.org/10.1117/12.10.1117/1.JPE.10.042005

KEYWORDS: Gallium arsenide, Coating, Bromine, Perovskite, Quantum dots, External quantum efficiency, Indium gallium phosphide, Reflectivity, Germanium, Multijunction solar cells

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Proceedings Article | 3 March 2020 Presentation + Paper

Presentation + Paper

Quasi-Fermi level splitting in InAs quantum dot solar cells from photoluminescence measurements

Ryo Tamaki, Yasushi Shoji, Laurent Lombez, Jean-François Guillemoles, Yoshitaka Okada

Proceedings Volume 11275, 112750X (2020) https://doi.org/10.1117/12.2545657

KEYWORDS: Indium arsenide, Solar cells, Calibration, Gallium arsenide, Diodes, Sun, Luminescence, Absorption, Spectral calibration, Spectroscopy

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Proceedings Article | 3 March 2020 Paper

Paper

Fabrication and optical characterization of ultrathin III-V transferred heterostructures for hot-carrier absorbers

Maxime Giteau, Kentaroh Watanabe, Naoya Miyashita, Hassanet Sodabanlu, Fabien Atlan, Daniel Suchet, Stéphane Collin, Jean-François Guillemoles, Yoshitaka Okada

Proceedings Volume 11275, 1127507 (2020) https://doi.org/10.1117/12.2544537

KEYWORDS: Gold, Gallium arsenide, Absorption, Etching, Mirrors, Photons, Ellipsometry, Electrons, Solar cells, Silicon

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Proceedings Article | 3 March 2020 Presentation + Paper

Presentation + Paper

Advanced analysis for hot-carriers photoluminescence spectrum

Hamidreza Esmaielpour, Maxime Giteau, Amaury Delamarre, François Gibelli, Dac-Trung Nguyen, Nicolas Cavassilas, Yoshitaka Okada, Jean-François Guillemoles, Laurent Lombez, Daniel Suchet

Proceedings Volume 11275, 112750A (2020) https://doi.org/10.1117/12.2547244

KEYWORDS: Indium gallium arsenide, Quantum wells, Gallium arsenide, Luminescence, Solar cells, Electrons, Nanostructuring, Solids, Semiconductors, Solar energy

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SPIE Journal Paper | 29 March 2019

Luminescent coupling effect in wafer-bonded III-V on silicon multijunction solar cells

Bernice Mae Yu Jeco, Elias Veinberg-Vidal, Laura Vauche, Katsuhisa Yoshida, Ryo Tamaki, Nazmul Ahsan, Yoshitaka Okada

JPE, Vol. 9, Issue 01, 015504, (March 2019) https://doi.org/10.1117/12.10.1117/1.JPE.9.015504

KEYWORDS: Silicon, Light emitting diodes, Sun, Electro optical modeling, Resistance, External quantum efficiency, Multijunction solar cells, Quantum efficiency, Gallium arsenide, Solar cells

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SPIE Journal Paper | 21 March 2019

Temperature dependence of wafer-bonded III-V on silicon multijunction solar cells with luminescent coupling effect

Bernice Mae Yu Jeco, Elias Veinberg-Vidal, Laura Vauche, Nazmul Ahsan, Yoshitaka Okada

JPE, Vol. 9, Issue 01, 015503, (March 2019) https://doi.org/10.1117/12.10.1117/1.JPE.9.015503

KEYWORDS: Silicon, External quantum efficiency, Light emitting diodes, Indium gallium phosphide, Solar energy, Temperature metrology, Sun, Absorption, Pulsed laser operation, Multijunction solar cells

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Proceedings Article | 27 February 2019 Paper

Paper

Light absorption enhancement in ultra-thin layers for hot-carrier solar cells: first developments towards the experimental demonstration of an enhanced hot-carrier effect with light trapping

Maxime Giteau, Kentaroh Watanabe, Naoya Miyashita, Hassanet Sodabanlu, Julie Goffard, Amaury Delamarre, Daniel Suchet, Ryo Tamaki, Zacharie Jehl, Laurent Lombez, Masakazu Sugiyama, Andrea Cattoni, Stéphane Collin, Jean-François Guillemoles, Yoshitaka Okada

Proceedings Volume 10913, 109130D (2019) https://doi.org/10.1117/12.2505908

KEYWORDS: Gallium arsenide, Epitaxial lateral overgrowth, Solar cells, Absorption, Etching, Mirrors, Luminescence, Electrons

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SPIE Journal Paper | 8 May 2018

Temperature dependence of luminescence coupling effect in InGaP/GaAs/Ge triple junction solar cells

Bernice Mae Yu Jeco, Tomah Sogabe, Nazmul Ahsan, Yoshitaka Okada

JPE, Vol. 8, Issue 02, 022602, (May 2018) https://doi.org/10.1117/12.10.1117/1.JPE.8.022602

KEYWORDS: Germanium, Temperature metrology, Electro optical modeling, Light emitting diodes, Luminescence, Solar cells, Gallium arsenide, Electro optics, Indium gallium phosphide, 3D modeling

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Proceedings Article | 16 February 2018 Paper

Paper

Non-ideal nanostructured intermediate band solar cells with an electronic ratchet

Amaury Delamarre, Daniel Suchet, Nicolas Cavassilas, Yoshitaka Okada, Masakazu Sugiyama, Jean-François Guillemoles

Proceedings Volume 10527, 105270R (2018) https://doi.org/10.1117/12.2287716

KEYWORDS: Absorption, Quantum wells, Solar cells, Nanostructures, Sun, Nanostructuring, Quantum dots, Solar energy, Quantum efficiency, Photovoltaics

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Proceedings Article | 16 February 2018 Presentation + Paper

Presentation + Paper

Characterization of InGaAs/GaAsN multiple quantum well with flat conduction band for improving carrier transport in multijuction solar cell

W. Yanwachirakul, N. Miyashita, H. Sodabanlu, K. Watanabe, Y. Okada, M. Sugiyama, Y. Nakano

Proceedings Volume 10527, 105270E (2018) https://doi.org/10.1117/12.2296574

KEYWORDS: Indium gallium arsenide, Gallium arsenide, Solar cells, Quantum wells, Germanium, Electron transport, Luminescence, Time resolved spectroscopy

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Proceedings Article | 16 February 2018 Presentation + Paper

Presentation + Paper

Quantitative analysis of InAs quantum dot solar cells by photoluminescence spectroscopy

Ryo Tamaki, Yasushi Shoji, Laurent Lombez, Jean-François Guillemoles, Yoshitaka Okada

Proceedings Volume 10527, 105270S (2018) https://doi.org/10.1117/12.2291465

KEYWORDS: Absorption, Gallium, Solar cells, Luminescence, Calibration, Indium arsenide, Spectroscopy, Hyperspectral imaging, Quantum dots, Quantitative analysis

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SPIE Journal Paper | 4 August 2017 Open Access

Open Access

Impact of optically nonuniform luminescence coupling effect to the limiting cell conversion efficiency in InGaP/GaAs/Ge triple junction solar cell

Bernice Mae F. Yu Jeco, Tomah Sogabe, Ryo Tamaki, Nazmul Ahsan, Yoshitaka Okada

JPE, Vol. 7, Issue 03, 035501, (August 2017) https://doi.org/10.1117/12.10.1117/1.JPE.7.035501

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SPIE Journal Paper | 22 June 2017 Open Access

Open Access

Effect of Si doping and sunlight concentration on the performance of InAs/GaAs quantum dot solar cells

Shunya Naito, Katsuhisa Yoshida, Naoya Miyashita, Ryo Tamaki, Takuya Hoshii, Yoshitaka Okada

JPE, Vol. 7, Issue 02, 025505, (June 2017) https://doi.org/10.1117/12.10.1117/1.JPE.7.025505

KEYWORDS: Doping, Silicon, Solar cells, Quantum dots, Modulation

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Proceedings Article | 29 March 2017 Presentation + Paper

Presentation + Paper

Multiband modification of III-V dilute nitrides for IBSC application

Nazmul Ahsan, Naoya Miyashita, Kin Man Yu, Wladek Walukiewicz, Yoshitaka Okada

Proceedings Volume 10099, 100990I (2017) https://doi.org/10.1117/12.2250700

KEYWORDS: Solar cells, Molecular beam epitaxy, Absorption, Photovoltaics, Group III-V semiconductors, Semiconductors, Infrared radiation, Gallium arsenide, Antimony, Thin films, Indium, Gallium, Solids, Reflectance spectroscopy, Chemical species

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Proceedings Article | 24 February 2017 Presentation + Paper

Presentation + Paper

Modeling and characterization of double resonant tunneling diodes for application as energy selective contacts in hot carrier solar cells

Zacharie Jehl, Daniel Suchet, Anatole Julian, Cyril Bernard, Naoya Miyashita, Francois Gibelli, Yoshitaka Okada, Jean-Francois Guillemolles

Proceedings Volume 10099, 100990N (2017) https://doi.org/10.1117/12.2250473

KEYWORDS: Solar energy, Solar cells, Molecular beam epitaxy, Diodes, Resistance, Nanostructuring, Resonance energy transfer, Heterojunctions, Temperature metrology, Gallium, Solids, Gallium arsenide

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Proceedings Article | 14 March 2016 Paper

Paper

Design optimization for two-step photon absorption in quantum dot solar cells by using infrared photocurrent spectroscopy

R. Tamaki, Y. Shoji, Y. Okada

Proceedings Volume 9743, 974318 (2016) https://doi.org/10.1117/12.2209225

KEYWORDS: Absorption, Solar cells, Infrared spectroscopy, Spectroscopy, FT-IR spectroscopy, Indium arsenide, Group III-V semiconductors, Gallium arsenide, Quantum dots, Photovoltaics, Solar energy

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SPIE Journal Paper | 5 June 2015

Quantitative optical measurement of chemical potentials in intermediate band solar cells

Pierre Rale, Amaury Delamarre, Gilbert El-Hajje, Ryo Tamaki, Kentaroh Watanabe, Yasushi Shoji, Yoshitaka Okada, Masakazu Sugiyama, Laurent Lombez, Jean-François Guillemoles

JPE, Vol. 5, Issue 01, 053092, (June 2015) https://doi.org/10.1117/12.10.1117/1.JPE.5.053092

KEYWORDS: Solar cells, Luminescence, Absorption, Quantum wells, Optical testing, External quantum efficiency, Gallium arsenide, Calibration, Hyperspectral imaging, Imaging systems

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Proceedings Article | 16 March 2015 Paper

Paper

Extreme broadband photocurrent spectroscopy on InAs quantum dot solar cells

R. Tamaki, Y. Shoji, S. Naitoh, Y. Okada, K. Miyano

Proceedings Volume 9358, 93580V (2015) https://doi.org/10.1117/12.2081084

KEYWORDS: External quantum efficiency, Mid-IR, Solar cells, Absorption, Indium arsenide, Doping, Quantum dots, Signal detection, Modulation, Gallium arsenide

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SPIE Journal Paper | 29 December 2014

Plasma etching antireflection nanostructures on optical elements in concentrator photovoltaic systems

Efrain Eduardo Tamayo Ruiz, Kentaroh Watanabe, Ryo Tamaki, Takuya Hoshii, Masakazu Sugiyama, Yoshitaka Okada, Kenjiro Miyano, Aleksandra Cvetkovic, Rubén Mohedano, Maikel Hernández

JPE, Vol. 5, Issue 01, 057006, (December 2014) https://doi.org/10.1117/12.10.1117/1.JPE.5.057006

KEYWORDS: Plasma etching, Transmittance, Nanostructures, Optical components, Antireflective coatings, Polymethylmethacrylate, External quantum efficiency, Interfaces, Glasses, Nanostructuring

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Proceedings Article | 29 February 2012 Paper

Paper

Device simulation of intermediate band solar cells

K. Yoshida, Y. Okada, N. Sano

Proceedings Volume 8256, 82560P (2012) https://doi.org/10.1117/12.910993

KEYWORDS: Doping, Electrons, Solar cells, Device simulation, Absorption, Sun, Photons, Physics, Chemical species, Instrument modeling

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Proceedings Article | 9 February 2012 Paper

Paper

Stacking-layer-number dependence of highly stacked InAs quantum dot laser diodes fabricated using strain-compensation technique

Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi, Sergio Bietti, Ayami Takata, Yoshitaka Okada

Proceedings Volume 8277, 827703 (2012) https://doi.org/10.1117/12.907533

KEYWORDS: Semiconductor lasers, Laser damage threshold, Indium arsenide, Fabrication, Diodes, Cladding, Internal quantum efficiency, Quantum dot lasers, Quantum dots, Optical components

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Proceedings Article | 5 September 2002 Paper

Paper

High-density self-organized quantum dots with improved size uniformity for optical device applications

Yoshitaka Okada, K. Akahane, Mitsuo Kawabe

Proceedings Volume 4913, (2002) https://doi.org/10.1117/12.482205

KEYWORDS: Gallium arsenide, Indium arsenide, Quantum dots, Indium gallium arsenide, Atomic force microscopy, Optical components, Fiber optic communications, Modulation, Luminescence, Semiconductor lasers

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Showing 5 of 28 publications

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