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Akimasa Yamada
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Journal Articles

Interface oxygen and heat sensitivity of Cu(In,Ga)Se2 and CuGaSe2 solar cells

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Shogo Ishizuka, Paul J. Fons, Akimasa Yamada, Yukiko Kamikawa-Shimizu, Hajime Shibata
Journal: Applied Physics Letters
Appl. Phys. Lett. 108, 203902 (2016)
https://doi.org/10.1063/1.4951670
Published: May 2016
View article titled, Interface oxygen and heat sensitivity of Cu(In,Ga)Se2 and CuGaSe2 solar cells
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Journal Articles

Investigation of deep-level defects in Cu(In,Ga)Se2 thin films by a steady-state photocapacitance method

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Xiaobo Hu, Takeaki Sakurai, Akimasa Yamada, Shogo Ishizuka, Sigeru Niki, Katsuhiro Akimoto
Journal: Journal of Applied Physics
J. Appl. Phys. 116, 163703 (2014)
https://doi.org/10.1063/1.4899321
Published: October 2014
View article titled, Investigation of deep-level defects in Cu(In,Ga)Se2 thin films by a steady-state photocapacitance method
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Journal Articles

Buried p-n junction formation in CuGaSe2 thin-film solar cells

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Shogo Ishizuka, Akimasa Yamada, Paul J. Fons, Yukiko Kamikawa-Shimizu, Hironori Komaki, Hajime Shibata, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 104, 031606 (2014)
https://doi.org/10.1063/1.4861858
Published: January 2014
View article titled, Buried p-n junction formation in CuGaSe2 thin-film solar cells
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Journal Articles

Erratum: “Impact of a binary Ga2Se3 precursor on ternary CuGaSe2 thin-film and solar cell device properties” [Appl. Phys. Lett. 103 , 143903 (2013)]

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Shogo Ishizuka, Akimasa Yamada, Paul J. Fons, Hajime Shibata, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 269903 (2013)
https://doi.org/10.1063/1.4858977
Published: December 2013
View article titled, Erratum: “Impact of a binary Ga2Se3 precursor on ternary CuGaSe2 thin-film and solar cell device properties” [Appl. Phys. Lett. 103 , 143903 (2013)]
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Journal Articles

Investigation of deep-level defects in Cu(In,Ga)Se2 thin films by two-wavelength excitation photo-capacitance spectroscopy

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Xiaobo Hu, Amit Gupta, Takeaki Sakurai, Akimasa Yamada, Shogo Ishizuka, Shigeru Niki, Katsuhiro Akimoto
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 163905 (2013)
https://doi.org/10.1063/1.4826144
Published: October 2013
View article titled, Investigation of deep-level defects in Cu(In,Ga)Se2 thin films by two-wavelength excitation photo-capacitance spectroscopy
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Journal Articles

Impact of a binary Ga2Se3 precursor on ternary CuGaSe2 thin-film and solar cell device properties

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Shogo Ishizuka, Akimasa Yamada, Paul J. Fons, Hajime Shibata, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 143903 (2013)
https://doi.org/10.1063/1.4823585
Published: October 2013
View article titled, Impact of a binary Ga2Se3 precursor on ternary CuGaSe2 thin-film and solar cell device properties
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Journal Articles

Na-induced variations in the structural, optical, and electrical properties of Cu ( In , Ga ) Se 2 thin films

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Shogo Ishizuka, Akimasa Yamada, Muhammad Monirul Islam, Hajime Shibata, Paul Fons, Takeaki Sakurai, Katsuhiro Akimoto, Shigeru Niki
Journal: Journal of Applied Physics
J. Appl. Phys. 106, 034908 (2009)
https://doi.org/10.1063/1.3190528
Published: August 2009
View article titled, Na-induced variations in the structural, optical, and electrical properties of Cu ( In , Ga ) Se 2 thin films
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Journal Articles

Flexible Cu ( In , Ga ) Se 2 solar cells fabricated using alkali-silicate glass thin layers as an alkali source material

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Shogo Ishizuka, Akimasa Yamada, Paul Fons, Shigeru Niki
Journal: Journal of Renewable and Sustainable Energy
J. Renewable Sustainable Energy 1, 013102 (2009)
https://doi.org/10.1063/1.3005376
Published: November 2008
View article titled, Flexible Cu ( In , Ga ) Se 2 solar cells fabricated using alkali-silicate glass thin layers as an alkali source material
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Journal Articles

Alkali incorporation control in Cu ( In , Ga ) Se 2 thin films using silicate thin layers and applications in enhancing flexible solar cell efficiency

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Shogo Ishizuka, Akimasa Yamada, Koji Matsubara, Paul Fons, Keiichiro Sakurai, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 93, 124105 (2008)
https://doi.org/10.1063/1.2992061
Published: September 2008
View article titled, Alkali incorporation control in Cu ( In , Ga ) Se 2 thin films using silicate thin layers and applications in enhancing flexible solar cell efficiency
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Journal Articles

Growth of polycrystalline Cu ( In , Ga ) Se 2 thin films using a radio frequency-cracked Se-radical beam source and application for photovoltaic devices

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Shogo Ishizuka, Hajime Shibata, Akimasa Yamada, Paul Fons, Keiichiro Sakurai, Koji Matsubara, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 91, 041902 (2007)
https://doi.org/10.1063/1.2766669
Published: July 2007
View article titled, Growth of polycrystalline Cu ( In , Ga ) Se 2 thin films using a radio frequency-cracked Se-radical beam source and application for photovoltaic devices
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Journal Articles

Control of the thin film properties of Cu ( In , Ga ) Se 2 using water vapor introduction during growth

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Shogo Ishizuka, Hajime Shibata, Akimasa Yamada, Paul Fons, Keiichiro Sakurai, Koji Matsubara, Shigeru Niki, Minoru Yonemura, Hisayuki Nakanishi
Journal: Journal of Applied Physics
J. Appl. Phys. 100, 096106 (2006)
https://doi.org/10.1063/1.2362991
Published: November 2006
View article titled, Control of the thin film properties of Cu ( In , Ga ) Se 2 using water vapor introduction during growth
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Journal Articles

Effect of band offset on the open circuit voltage of heterojunction CuIn 1 − x Ga x Se 2 solar cells

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Akimasa Yamada, Koji Matsubara, Keiichiro Sakurai, Shogo Ishizuka, Hitoshi Tampo, Paul J. Fons, Kakuya Iwata, Shigeru Niki
Journal: Applied Physics Letters
Appl. Phys. Lett. 85, 5607–5609 (2004)
https://doi.org/10.1063/1.1831566
Published: December 2004
View article titled, Effect of band offset on the open circuit voltage of heterojunction CuIn 1 − x Ga x Se 2 solar cells
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Journal Articles

Temperature variation of nonradiative carrier recombination processes in high-quality CuGaSe 2 thin films grown by molecular beam epitaxy

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Kenji Yoshino, Daisuke Maruoka, Tetsuo Ikari, Paul J. Fons, Shigeru Niki, Akimasa Yamada
Journal: Applied Physics Letters
Appl. Phys. Lett. 77, 259–261 (2000)
https://doi.org/10.1063/1.126943
Published: July 2000
View article titled, Temperature variation of nonradiative carrier recombination processes in high-quality CuGaSe 2 thin films grown by molecular beam epitaxy
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Journal Articles

Optical characterizations of CuInSe 2 epitaxial layers grown by molecular beam epitaxy

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Kenji Yoshino, Hirosumi Yokoyama, Kouji Maeda, Tetsuo Ikari, Atsuhiko Fukuyama, Paul. J. Fons, Akimasa Yamada, Shigeru Niki
Journal: Journal of Applied Physics
J. Appl. Phys. 86, 4354–4359 (1999)
https://doi.org/10.1063/1.371369
Published: October 1999
View article titled, Optical characterizations of CuInSe 2 epitaxial layers grown by molecular beam epitaxy
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Journal Articles

A shallow state in molecular beam epitaxial grown CuGaSe2 film detectable by 1.62 eV photoluminescence

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Akimasa Yamada, Paul Fons, Shigeru Niki, Hajime Shibata, Akira Obara, Yunosuke Makita, Hiroyuki Oyanagi
Journal: Journal of Applied Physics
J. Appl. Phys. 81, 2794–2798 (1997)
https://doi.org/10.1063/1.363936
Published: March 1997
View article titled, A shallow state in molecular beam epitaxial grown CuGaSe2 film detectable by 1.62 eV photoluminescence
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Journal Articles

Band‐edge photoluminescence of CuGaSe2 films grown by molecular beam epitaxy

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Akimasa Yamada, Yunosuke Makita, Shigeru Niki, Akira Obara, Paul Fons, Hajime Shibata, Michihiro Kawai, Shigefusa Chichibu, Hisayuki Nakanishi
Journal: Journal of Applied Physics
J. Appl. Phys. 79, 4318–4322 (1996)
https://doi.org/10.1063/1.361800
Published: April 1996
View article titled, Band‐edge photoluminescence of CuGaSe2 films grown by molecular beam epitaxy
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Journal Articles

Photoluminescence study of Sr+ ion‐implanted GaAs

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Hong‐Lie Shen, Yunosuke Makita, Werner Dittrich, Shinji Kimura, Hisao Tanoue, Akimasa Yamada, Tsutomu Iida, Akira Obara
Journal: Journal of Applied Physics
J. Appl. Phys. 77, 4828–4830 (1995)
https://doi.org/10.1063/1.359408
Published: May 1995
View article titled, Photoluminescence study of Sr+ ion‐implanted GaAs
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Journal Articles

Ion‐beam doping of GaAs with low‐energy (100 eV) C+ using combined ion‐beam and molecular‐beam epitaxy

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Tsutomu Iida, Yunosuke Makita, Shinji Kimura, Stefan Winter, Akimasa Yamada, Paul Fons, Shin‐ichiro Uekusa
Journal: Journal of Applied Physics
J. Appl. Phys. 77, 146–152 (1995)
https://doi.org/10.1063/1.359361
Published: January 1995
View article titled, Ion‐beam doping of GaAs with low‐energy (100 eV) C+ using combined ion‐beam and molecular‐beam epitaxy
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Journal Articles

Characterization of Ca+ ion‐implanted GaAs by photoluminescence

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Hong‐Lie Shen, Yunosuke Makita, Shinji Kimura, Hisao Tanoue, Akimasa Yamada, Hajime Shibata, Akira Obara, Shiro Sakuragi
Journal: Applied Physics Letters
Appl. Phys. Lett. 65, 1427–1429 (1994)
https://doi.org/10.1063/1.112005
Published: September 1994
View article titled, Characterization of Ca+ ion‐implanted GaAs by photoluminescence
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Journal Articles

Low energy (100 eV) C+ ion doping into GaAs using combined ion beam and molecular beam epitaxial technology

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Tsutomu Iida, Yunosuke Makita, Shinji Kimura, Stefan Winter, Akimasa Yamada, Hajime Shibata, Akira Obara, Shigeru Niki, Paul Fons, Yushin Tsai, Shin‐ichiro Uekusa
Journal: Applied Physics Letters
Appl. Phys. Lett. 63, 1951–1953 (1993)
https://doi.org/10.1063/1.110611
Published: October 1993
View article titled, Low energy (100 eV) C+ ion doping into GaAs using combined ion beam and molecular beam epitaxial technology
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