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Journal Articles

Multi-step photon upconversion in quantum-dot-based solar cells with a double-heterointerface structure

Hambalee Mahamu, Shigeo Asahi, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 133, 124503 (2023)
https://doi.org/10.1063/5.0138101
Published: March 2023
View article titled, Multi-step photon upconversion in quantum-dot-based solar cells with a double-heterointerface structure
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Journal Articles

Publisher’s Note: “Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature” [J. Appl. Phys. 130, 124505 (2021)]

Yaxing Zhu, Shigeo Asahi, Naoya Miyashita, Yoshitaka Okada, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 130, 179901 (2021)
https://doi.org/10.1063/5.0074960
Published: November 2021
View article titled, Publisher’s Note: “Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature” [J. Appl. Phys. 130, 124505 (2021)]
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Journal Articles

Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature

Editor’s Pick
Yaxing Zhu, Shigeo Asahi, Naoya Miyashita, Yoshitaka Okada, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 130, 124505 (2021)
https://doi.org/10.1063/5.0060569
Published: September 2021
View article titled, Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature
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Journal Articles

Voltage boost effects in two-step photon upconversion solar cells with a modulation-doped structure

Kohei Watanabe, Shigeo Asahi, Yaxing Zhu, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 130, 085701 (2021)
https://doi.org/10.1063/5.0058518
Published: August 2021
View article titled, Voltage boost effects in two-step photon upconversion solar cells with a modulation-doped structure
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Journal Articles

Two-step excitation induced photovoltaic properties in an InAs quantum dot-in-well intermediate-band solar cell

Editor’s Pick
Yaxing Zhu, Shigeo Asahi, Kohei Watanabe, Naoya Miyashita, Yoshitaka Okada, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 129, 074503 (2021)
https://doi.org/10.1063/5.0036313
Published: February 2021
View article titled, Two-step excitation induced photovoltaic properties in an InAs quantum dot-in-well intermediate-band solar cell
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Journal Articles

Resonant exciton excitation photoluminescence and dynamics in a GaAs/AlAs multiple quantum well with internal electric field

Osamu Kojima, Takashi Kita, Matthew J. Steer, Richard A. Hogg
Journal: AIP Advances
AIP Advances 10, 095016 (2020)
https://doi.org/10.1063/5.0020177
Published: September 2020
View article titled, Resonant exciton excitation photoluminescence and dynamics in a GaAs/AlAs multiple quantum well with internal electric field
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Includes: Supplementary data
Journal Articles

Determination of silicon wafer site flatness using dual heterodyne interferometers with sub-nanometer precision

Kazuhiko Tahara, Hideki Matsuoka, Noritaka Morioka, Hidetoshi Tsunaki, Masato Kannaka, Takashi Kita
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 91, 065114 (2020)
https://doi.org/10.1063/1.5143534
Published: June 2020
View article titled, Determination of silicon wafer site flatness using dual heterodyne interferometers with sub-nanometer precision
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Journal Articles

Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

Osamu Kojima, Junpei Nagauchi, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 126, 033103 (2019)
https://doi.org/10.1063/1.5090831
Published: July 2019
View article titled, Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches
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Journal Articles

Wide-wavelength-range control of photoluminescence polarization in closely stacked InAs/GaAs quantum dots

Toshiyuki Kaizu, Yusuke Tajiri, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 125, 234304 (2019)
https://doi.org/10.1063/1.5096411
Published: June 2019
View article titled, Wide-wavelength-range control of photoluminescence polarization in closely stacked InAs/GaAs quantum dots
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Journal Articles

Two-step photocurrent generation enhanced by miniband formation in InAs/GaAs quantum dot superlattice intermediate-band solar cells

Editor’s Pick
Sho Watanabe, Shigeo Asahi, Tomoyuki Kada, Kazuki Hirao, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita
Journal: Applied Physics Letters
Appl. Phys. Lett. 110, 193104 (2017)
https://doi.org/10.1063/1.4983288
Published: May 2017
View article titled, Two-step photocurrent generation enhanced by miniband formation in InAs/GaAs quantum dot superlattice intermediate-band solar cells
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Journal Articles

Polarization characteristics of electroluminescence and net modal gain in highly stacked InAs/GaAs quantum-dot laser devices

Masaya Suwa, Takaya Andachi, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 120, 134313 (2016)
https://doi.org/10.1063/1.4964446
Published: October 2016
View article titled, Polarization characteristics of electroluminescence and net modal gain in highly stacked InAs/GaAs quantum-dot laser devices
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Journal Articles

Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

Junpei Nagauchi, Osamu Kojima, Takashi Kita, YongGu Shim
Journal: AIP Advances
AIP Advances 6, 075209 (2016)
https://doi.org/10.1063/1.4959191
Published: July 2016
View article titled, Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films
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Journal Articles

Emission-wavelength tuning of InAs quantum dots grown on nitrogen-δ-doped GaAs(001)

Toshiyuki Kaizu, Kohei Taguchi, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 119, 194306 (2016)
https://doi.org/10.1063/1.4951719
Published: May 2016
View article titled, Emission-wavelength tuning of InAs quantum dots grown on nitrogen-δ-doped GaAs(001)
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Journal Articles

Effects of rapid thermal annealing on two-dimensional delocalized electronic states of the epitaxial N δ-doped layer in GaAs

Yasuhiro Ogawa, Yukihiro Harada, Takeshi Baba, Toshiyuki Kaizu, Takashi Kita
Journal: Applied Physics Letters
Appl. Phys. Lett. 108, 111905 (2016)
https://doi.org/10.1063/1.4944055
Published: March 2016
View article titled, Effects of rapid thermal annealing on two-dimensional delocalized electronic states of the epitaxial N δ-doped layer in GaAs
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Journal Articles

Broadband control of emission wavelength of InAs/GaAs quantum dots by GaAs capping temperature

Toshiyuki Kaizu, Takuya Matsumura, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 118, 154301 (2015)
https://doi.org/10.1063/1.4933182
Published: October 2015
View article titled, Broadband control of emission wavelength of InAs/GaAs quantum dots by GaAs capping temperature
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Journal Articles

Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique

Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Yunpeng Wang, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano
Journal: Applied Physics Letters
Appl. Phys. Lett. 107, 043901 (2015)
https://doi.org/10.1063/1.4927612
Published: July 2015
View article titled, Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique
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Includes: Supplementary data
Journal Articles

Thermal annealing effects on ultra-violet luminescence properties of Gd doped AlN

Takashi Kita, Yuta Ishizu, Kazuma Tsuji, Yukihiro Harada, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi
Journal: Journal of Applied Physics
J. Appl. Phys. 117, 163105 (2015)
https://doi.org/10.1063/1.4919419
Published: April 2015
View article titled, Thermal annealing effects on ultra-violet luminescence properties of Gd doped AlN
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Journal Articles

Microscopic properties of degradation-free capped GdN thin films studied by electron spin resonance

Tokuro Shimokawa, Yohei Fukuoka, Masashi Fujisawa, Weimin Zhang, Susumu Okubo, Takahiro Sakurai, Hitoshi Ohta, Reddithota Vidyasagar, Hiroaki Yoshitomi, Shinya Kitayama, Takashi Kita
Journal: Journal of Applied Physics
J. Appl. Phys. 117, 043909 (2015)
https://doi.org/10.1063/1.4906436
Published: January 2015
View article titled, Microscopic properties of degradation-free capped GdN thin films studied by electron spin resonance
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Journal Articles

Effect of exciton oscillator strength on upconversion photoluminescence in GaAs/AlAs multiple quantum wells

Osamu Kojima, Shouhei Okumura, Takashi Kita, Kouichi Akahane
Journal: Applied Physics Letters
Appl. Phys. Lett. 105, 181901 (2014)
https://doi.org/10.1063/1.4901080
Published: November 2014
View article titled, Effect of exciton oscillator strength on upconversion photoluminescence in GaAs/AlAs multiple quantum wells
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Journal Articles

Hot-carrier solar cells using low-dimensional quantum structures

Daiki Watanabe, Naofumi Kasamatsu, Yukihiro Harada, Takashi Kita
Journal: Applied Physics Letters
Appl. Phys. Lett. 105, 171904 (2014)
https://doi.org/10.1063/1.4900947
Published: October 2014
View article titled, Hot-carrier solar cells using low-dimensional quantum structures
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