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Journal Articles

Characteristics of intermediate state related to anti-Stokes luminescence of ZnO single crystals

Katsushi Fujii (藤井克司), Takenari Goto (後藤武生), Takafumi Yao (八百隆文)
Journal: Journal of Applied Physics
J. Appl. Phys. 115, 233510 (2014)
https://doi.org/10.1063/1.4883956
Published: June 2014
View article titled, Characteristics of intermediate state related to anti-Stokes luminescence of ZnO single crystals
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Journal Articles

Effects of gallium doping on properties of a -plane ZnO films on r -plane sapphire substrates by plasma-assisted molecular beam epitaxy

Seok Kyu Han, Hyo Sung Lee, Dong Seok Lim, Soon-Ku Hong, Nara Yoon, Dong-Cheol Oh, Byung Jun Ahn, Jung-Hoon Song, Takafumi Yao
Journal: Journal of Vacuum Science & Technology A
J. Vac. Sci. Technol. A 29, 03A111 (2011)
https://doi.org/10.1116/1.3562162
Published: March 2011
View article titled, Effects of gallium doping on properties of a -plane ZnO films on r -plane sapphire substrates by plasma-assisted molecular beam epitaxy
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Journal Articles

Ultraviolet stimulated emission in periodically polarity-inverted ZnO structures at room temperature

Jinsub Park, Takenari Goto, Sung Hyun Park, Jun-seok Ha, Euijoon Yoon, Takafumi Yao
Journal: Applied Physics Letters
Appl. Phys. Lett. 97, 171101 (2010)
https://doi.org/10.1063/1.3503605
Published: October 2010
View article titled, Ultraviolet stimulated emission in periodically polarity-inverted ZnO structures at room temperature
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Journal Articles

Correlation between structural and optical properties of a -plane GaN films grown on r -plane sapphire by metal organic chemical-vapor deposition

Mina Jung, Jiho Chang, Hyunjae Lee, Jun-seok Ha, Jin-sub Park, Seungwhan Park, Katsushi Fujii, Takafumi Yao, Gyung-suk Kil, Seogwoo Lee, Myungwhan Cho, Sungmin Whang, Yong-gon Seo
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 28, 623–626 (2010)
https://doi.org/10.1116/1.3388889
Published: May 2010
View article titled, Correlation between structural and optical properties of a -plane GaN films grown on r -plane sapphire by metal organic chemical-vapor deposition
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Journal Articles

Effect of anion-to-cation supplying ratio on the surface morphology of AlN films grown on ZnO substrates at low temperature

Inho Im, Mina Jung, Jieun Koo, Hyunjae Lee, Jinsub Park, Tsutomu Minegishi, Seunghwan Park, Katsushi Fujii, Takafumi Yao, Gyungsuk Kil, Takashi Hanada, Jiho Chang
Journal: Journal of Vacuum Science & Technology A
J. Vac. Sci. Technol. A 28, 61–64 (2010)
https://doi.org/10.1116/1.3264479
Published: November 2009
View article titled, Effect of anion-to-cation supplying ratio on the surface morphology of AlN films grown on ZnO substrates at low temperature
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Journal Articles

Leakage current improvement of nitride-based light emitting diodes using CrN buffer layer and its vertical type application by chemical lift-off process

Katsushi Fujii (藤井克司), Seogwoo Lee (李錫雨), Jun-Seok Ha (河俊碩), Hyun-Jae Lee (李賢宰), Hyo-Jong Lee (李孝鐘), Sang-Hyun Lee (李常賢), Takashi Kato (加藤崇), Meoung-Whan Cho (曺明煥), Takafumi Yao (八百隆文)
Journal: Applied Physics Letters
Appl. Phys. Lett. 94, 242108 (2009)
https://doi.org/10.1063/1.3155422
Published: June 2009
View article titled, Leakage current improvement of nitride-based light emitting diodes using CrN buffer layer and its vertical type application by chemical lift-off process
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Journal Articles

Effects of two-step growth by employing Zn-rich and O-rich growth conditions on properties of ( 11 2 ¯ ) ZnO films grown by plasma-assisted molecular beam epitaxy on sapphire

Seok Kyu Han, Jae Goo Kim, Jung-Hyun Kim, Soon-Ku Hong, Jae Wook Lee, Jeong Yong Lee, Jung-Hoon Song, Yoon Sung Nam, Soo-Kyung Chang, Takafumi Yao
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 27, 1635–1640 (2009)
https://doi.org/10.1116/1.3130153
Published: May 2009
View article titled, Effects of two-step growth by employing Zn-rich and O-rich growth conditions on properties of ( 11 2 ¯ ) ZnO films grown by plasma-assisted molecular beam epitaxy on sapphire
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Journal Articles

Growth and structural properties of ZnO films on ( 10 − 10 )   m -plane sapphire substrates by plasma-assisted molecular beam epitaxy

Jung-Hyun Kim, Seok Kyu Han, Sun Ig Hong, Soon-Ku Hong, Jae Wook Lee, Jeong Yong Lee, Jung-Hoon Song, Jin Sub Park, Takafumi Yao
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 27, 1625–1630 (2009)
https://doi.org/10.1116/1.3119682
Published: May 2009
View article titled, Growth and structural properties of ZnO films on ( 10 − 10 )   m -plane sapphire substrates by plasma-assisted molecular beam epitaxy
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Journal Articles

Anisotropic optical properties of free and bound excitons in highly strained A -plane ZnO investigated with polarized photoreflectance and photoluminescence spectroscopy

Yoon Sung Nam, Sang Wook Lee, K. S. Baek, S. K. Chang, Jae-Ho Song, Jung-Hoon Song, Seok Kyu Han, Soon-Ku Hong, Takafumi Yao
Journal: Applied Physics Letters
Appl. Phys. Lett. 92, 201907 (2008)
https://doi.org/10.1063/1.2930683
Published: May 2008
View article titled, Anisotropic optical properties of free and bound excitons in highly strained A -plane ZnO investigated with polarized photoreflectance and photoluminescence spectroscopy
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Journal Articles

Reduction of dislocations in GaN films on AlN/sapphire templates using CrN nanoislands

Jun-Seok Ha, Hyo-Jong Lee, Seog Woo Lee, Hyun Jae Lee, Sang Hyun Lee, Hiroki Goto, Meoung Whan Cho, Takafumi Yao, Soon-Ku Hong, Ryuichi Toba, Jae Wook Lee, Jeong Yong Lee
Journal: Applied Physics Letters
Appl. Phys. Lett. 92, 091906 (2008)
https://doi.org/10.1063/1.2890488
Published: March 2008
View article titled, Reduction of dislocations in GaN films on AlN/sapphire templates using CrN nanoislands
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Journal Articles

Photoelectrochemical reaction and H 2 generation at zero bias optimized by carrier concentration of n -type GaN

Masato Ono, Katsushi Fujii, Takashi Ito, Yasuhiro Iwaki, Akira Hirako, Takafumi Yao, Kazuhiro Ohkawa
Journal: The Journal of Chemical Physics
J. Chem. Phys. 126, 054708 (2007)
https://doi.org/10.1063/1.2432116
Published: February 2007
View article titled, Photoelectrochemical reaction and H 2 generation at zero bias optimized by carrier concentration of n -type GaN
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Journal Articles

Depth-resolved optical studies of excitonic and phonon-assisted transitions in ZnO epilayers

Yong-Hoon Cho, Ji-Young Kim, Ho-Sang Kwack, Bong-Joon Kwon, Le Si Dang, Hang-Ju Ko, Takafumi Yao
Journal: Applied Physics Letters
Appl. Phys. Lett. 89, 201903 (2006)
https://doi.org/10.1063/1.2388252
Published: November 2006
View article titled, Depth-resolved optical studies of excitonic and phonon-assisted transitions in ZnO epilayers
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Journal Articles

Slowdown in development of self-assembled In As ∕ Ga As ( 001 ) dots near the critical thickness

Takashi Hanada, Hirofumi Totsuka, Soon-Ku Hong, Kenji Godo, Kensuke Miyajima, Takenari Goto, Takafumi Yao
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 24, 1886–1890 (2006)
https://doi.org/10.1116/1.2219756
Published: July 2006
View article titled, Slowdown in development of self-assembled In As ∕ Ga As ( 001 ) dots near the critical thickness
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Journal Articles

Experimental demonstration of Fano-type resonance in photoluminescence of ZnS : Mn ∕ SiO 2 one-dimensional photonic crystals

Takeshi Baba, Hisao Makino, Takahiro Mori, Takashi Hanada, Takafumi Yao, Hyun-Yong Lee
Journal: Applied Physics Letters
Appl. Phys. Lett. 87, 171106 (2005)
https://doi.org/10.1063/1.2117611
Published: October 2005
View article titled, Experimental demonstration of Fano-type resonance in photoluminescence of ZnS : Mn ∕ SiO 2 one-dimensional photonic crystals
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Journal Articles

GaNAs(001) surface phases under growing condition

Takahiro Mori, Toshiharu Morimura, Takashi Hanada, Takafumi Yao
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 23, 1341–1344 (2005)
https://doi.org/10.1116/1.1894416
Published: June 2005
View article titled, GaNAs(001) surface phases under growing condition
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Journal Articles

Selective growth of Zn- and O-polar ZnO layers by plasma-assisted molecular beam epitaxy

Tsutomu Minegishi, JungHoon Yoo, Hideyuki Suzuki, Zahra Vashaei, Katsuhiko Inaba, Keesam Shim, Takafumi Yao
Journal: Journal of Vacuum Science & Technology B
J. Vac. Sci. Technol. B 23, 1286–1290 (2005)
https://doi.org/10.1116/1.1861932
Published: June 2005
View article titled, Selective growth of Zn- and O-polar ZnO layers by plasma-assisted molecular beam epitaxy
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Journal Articles

Multiple-wavelength-transmission filters based on Si- SiO 2 one-dimensional photonic crystals

Hyun-Yong Lee, Sung-June Cho, Gi-Yeon Nam, Wook-Hyun Lee, Takeshi Baba, Hisao Makino, Meoung-Whan Cho, Takafumi Yao
Journal: Journal of Applied Physics
J. Appl. Phys. 97, 103111 (2005)
https://doi.org/10.1063/1.1903107
Published: May 2005
View article titled, Multiple-wavelength-transmission filters based on Si- SiO 2 one-dimensional photonic crystals
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Journal Articles

Characteristics of dislocations in ZnO layers grown by plasma-assisted molecular beam epitaxy under different Zn ∕ O flux ratios

Agus Setiawan, Zahra Vashaei, Meoung Whan Cho, Takafumi Yao, Hiroyuki Kato, Michihiro Sano, Kazuhiro Miyamoto, I. Yonenaga, Hang Ju Ko
Journal: Journal of Applied Physics
J. Appl. Phys. 96, 3763–3768 (2004)
https://doi.org/10.1063/1.1785852
Published: October 2004
View article titled, Characteristics of dislocations in ZnO layers grown by plasma-assisted molecular beam epitaxy under different Zn ∕ O flux ratios
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Journal Articles

Polarity control of ZnO on sapphire by varying the MgO buffer layer thickness

Hiroyuki Kato, Kazuhiro Miyamoto, Michihiro Sano, Takafumi Yao
Journal: Applied Physics Letters
Appl. Phys. Lett. 84, 4562–4564 (2004)
https://doi.org/10.1063/1.1759377
Published: May 2004
View article titled, Polarity control of ZnO on sapphire by varying the MgO buffer layer thickness
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Journal Articles

Role of hydrogen in molecular beam epitaxy of ZnO

Michihiro Sano, Kazuhiro Miyamoto, Hiroyuki Kato, Takafumi Yao
Journal: Journal of Applied Physics
J. Appl. Phys. 95, 5527–5531 (2004)
https://doi.org/10.1063/1.1704868
Published: May 2004
View article titled, Role of hydrogen in molecular beam epitaxy of ZnO
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