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1

Polarity control of GaN epilayers grown on ZnO templates

Takuma Suzuki, Hang-Ju Ko, Agus Setiawan, Jung-Jin Kim, Koh Saitoh, Masami Terauchi, Takafumi Yao

Journal:

Materials Science in Semiconductor Processing

Year:

2003

Language:

english

File:

PDF, 264 KB

english, 2003

2

Phase separation in Ga-doped MgZnO layers grown by plasma-assisted molecular-beam epitaxy

Chihiro Harada, Hang-Ju Ko, Hisao Makino, Takafumi Yao

Journal:

Materials Science in Semiconductor Processing

Year:

2003

Language:

english

File:

PDF, 207 KB

english, 2003

3

Investigation of high-quality CuInSe2 films with various Cu/In ratios

Hang-Ju Ko, Gyoung-Hoon Lee, Hyo-Jin Kim, Myoung-Soo Han, Chae-Hwan Jeong, Jong-Ho Lee, Ho-Sung Kim, Jin-Hyeok Kim, Kwang-Bok Kim, Suk-Ho Lee

Journal:

Journal of Crystal Growth

Year:

2011

Language:

english

File:

PDF, 610 KB

english, 2011

4

Dynamics of high-density excitons and electron–hole plasma in ZnO epitaxial thin films

Nobuyuki Arai, Jun Takeda, Hang-Ju Ko, Takafumi Yao

Journal:

Journal of Luminescence

Year:

2006

Language:

english

File:

PDF, 138 KB

english, 2006

5

Optical studies of ZnO thin films grown on O- and H-plasma treated Al2O3 substrates by plasma-assisted molecular beam epitaxy

Sun-Kyun Lee, Ji-Young Kim, Bong-Joon Kwon, Yong-Hoon Cho, Hang-Ju Ko, Takafumi Yao

Journal:

Solid State Communications

Year:

2008

Language:

english

File:

PDF, 1.52 MB

english, 2008

6

Two-dimensional growth of ZnO films on sapphire(0 0 0 1) with buffer layers

Yefan Chen, Hang-ju Ko, Soon-ku Hong, Takafumi Yao, Yusaburo Segawa

Journal:

Journal of Crystal Growth

Year:

2000

Language:

english

File:

PDF, 344 KB

english, 2000

7

Evolution of initial layers of plasma-assisted MBE grown ZnO on (0 0 0 1)GaN/sapphire

Soon-Ku Hong, Hang-Ju Ko, Yefan Chen, Takashi Hanada, Takafumi Yao

Journal:

Journal of Crystal Growth

Year:

2000

Language:

english

File:

PDF, 415 KB

english, 2000

8

Growth of PrSrMnO3-like thin films on NGO (1 1 0) substrates by plasma assisted MBE

Guojun Liu, Hongmei Wang, H. Makino, Hang-Ju Ko, T. Hanada, T. Yao

Journal:

Journal of Crystal Growth

Year:

2001

Language:

english

File:

PDF, 220 KB

english, 2001

9

Doping effects in ZnO layers using Li3N as a doping source

Hang-Ju Ko, Yefan Chen, Soon-Ku Hong, Takafumi Yao

Journal:

Journal of Crystal Growth

Year:

2003

Language:

english

File:

PDF, 277 KB

english, 2003

10

Defect characterization in epitaxial ZnO/epi-GaN/Al2O3 heterostructures: transmission electron microscopy and triple-axis X-ray diffractometry

Soon-Ku Hong, Hang-Ju Ko, Yefan Chen, Takafumi Yao

Journal:

Journal of Crystal Growth

Year:

2000

Language:

english

File:

PDF, 354 KB

english, 2000

11

Control and characterization of ZnO/GaN heterointerfaces in plasma-assisted MBE-grown ZnO films on GaN/Al2O3

Soon-Ku Hong, Hang-Ju Ko, Yefan Chen, Takashi Hanada, Takafumi Yao

Journal:

Applied Surface Science

Year:

2000

Language:

english

File:

PDF, 1.67 MB

english, 2000

12

Improvement of the quality of ZnO substrates by annealing

Hang-Ju Ko, Myung-Soo Han, Young-Sik Park, Yun-Sik Yu, Byong-In Kim, Sang Sub Kim, Jin-Hyeok Kim

Journal:

Journal of Crystal Growth

Year:

2004

Language:

english

File:

PDF, 359 KB

english, 2004

13

A challenge in molecular beam epitaxy of ZnO: control of material properties by interface engineering

Hang-Ju Ko, Soon-Ku Hong, Yefen Chen, Takafumi Yao

Journal:

Thin Solid Films

Year:

2002

Language:

english

File:

PDF, 749 KB

english, 2002

14

Control of polarity of heteroepitaxial ZnO films by interface engineering

Soon-Ku Hong, Takashi Hanada, Yefen Chen, Hang-Ju Ko, Takafumi Yao, Daisuke Imai, Kiyoaki Araki, Makoto Shinohara

Journal:

Applied Surface Science

Year:

2002

Language:

english

File:

PDF, 450 KB

english, 2002

15

Layer-by-layer growth of ZnO epilayer on Al2O3(0001) by using a MgO buffer layer

Chen, Yefan, Ko, Hang-Ju, Hong, Soon-Ku, Yao, Takafumi

Journal:

Applied Physics Letters

Year:

2000

Language:

english

File:

PDF, 446 KB

english, 2000

16

Tunable Electronic Transport Characteristics of Surface-Architecture-Controlled ZnO Nanowire Field Effect Transistors

Hong, Woong-Ki, Sohn, Jung Inn, Hwang, Dae-Kue, Kwon, Soon-Shin, Jo, Gunho, Song, Sunghoon, Kim, Seong-Min, Ko, Hang-Ju, Park, Seong-Ju, Welland, Mark E., Lee, Takhee

Journal:

Year:

2008

Language:

english

File:

PDF, 295 KB

english, 2008

17

Excitonic transition dynamics on front and back surfaces of ZnO thin films

Lee, Sun-Kyun, Kwon, Bong-Joon, Cho, Yong-Hoon, Ko, Hang-Ju, Yao, Takafumi

Journal:

Physical Review B

Year:

2011

Language:

english

File:

PDF, 450 KB

english, 2011

18

Morphology evolution of ZnO(000â1Ì) surface during plasma-assisted molecular-beam epitaxy

Chen, Yefan, Ko, Hang-Ju, Hong, Soon-Ku, Yao, Takafumi, Segawa, Yusaburo

Journal:

Applied Physics Letters

Year:

2002

Language:

english

File:

PDF, 483 KB

english, 2002

19

Investigation of ZnO epilayers grown under various Zn/O ratios by plasma-assisted molecular-beam epitaxy

Ko, Hang-Ju, Yao, Takafumi, Chen, Yefan, Hong, Soon-Ku

Journal:

Journal of Applied Physics

Year:

2002

Language:

english

File:

PDF, 529 KB

english, 2002

20

Effects of an extremely thin buffer on heteroepitaxy with large lattice mismatch

Chen, Yefan, Hong, Soon-ku, Ko, Hang-ju, Kirshner, V., Wenisch, H., Yao, Takafumi, Inaba, Katsuhiko, Segawa, Yusaburo

Journal:

Applied Physics Letters

Year:

2001

Language:

english

File:

PDF, 538 KB

english, 2001

21

The effect of ITO/Mo/MoO3 anode multilayer film on efficient hole extraction in MEH–PPV/ZnO NP hybrid solar cells

Park, Jaehyoung, Park, Gwanghoon, Ko, Hang-Ju, Ha, Jun-Seok

Journal:

Ceramics International

Year:

2014

Language:

english

File:

PDF, 1.18 MB

english, 2014

22

Band alignment at a ZnO/GaN (0001) heterointerface

Hong, Soon-Ku, Hanada, Takashi, Makino, Hisao, Chen, Yefan, Ko, Hang-Ju, Yao, Takafumi, Tanaka, Akinori, Sasaki, Hiroyuki, Sato, Shigeru

Journal:

Applied Physics Letters

Year:

2001

Language:

english

File:

PDF, 304 KB

english, 2001

23

Control of polarity of ZnO films grown by plasma-assisted molecular-beam epitaxy: Zn- and O-polar ZnO films on Ga-polar GaN templates

Hong, Soon-Ku, Hanada, Takashi, Ko, Hang-Ju, Chen, Yefan, Yao, Takafumi, Imai, Daisuke, Araki, Kiyoaki, Shinohara, Makoto

Journal:

Applied Physics Letters

Year:

2000

Language:

english

File:

PDF, 473 KB

english, 2000

24

Stimulated emission and optical gain in ZnO epilayers grown by plasma-assisted molecular-beam epitaxy with buffers

Chen, Yefan, Tuan, N. T., Segawa, Yusaburo, Ko, Hang-ju, Hong, Soon-ku, Yao, Takafumi

Journal:

Applied Physics Letters

Year:

2001

Language:

english

File:

PDF, 250 KB

english, 2001

25

Plasma-assisted molecular-beam epitaxy of ZnO epilayers on atomically flat MgAl[sub 2]O[sub 4](111) substrates

Chen, Yefan, Hong, Soon-ku, Ko, Hang-ju, Nakajima, Masa, Yao, Takafumi, Segawa, Yusaburo

Journal:

Applied Physics Letters

Year:

2000

Language:

english

File:

PDF, 468 KB

english, 2000

26

[IEEE International Conference on Molecular Bean Epitaxy - San Francisco, CA, USA (15-20 Sept. 2002)] International Conference on Molecular Bean Epitaxy - Doping of acceptor impurities into ZnO

Hang-Ju Ko,, Setiawan, A., Harada, C., Suzuki, T., Yao, T.

Year:

2002

Language:

english

File:

PDF, 89 KB

english, 2002

27

Design and Preparation of AlN/GaN Quantum Wells for Quantum Cascade Laser Applications

Ishida, Akihiro, Matsue, Kazuma, Inoue, Yoku, Fujiyasu, Hiroshi, Ko, Hang-Ju, Setiawan, Agus, Kim, Jung-Jin, Makino, Hisao, Yao, Takafumi

Journal:

Japanese Journal of Applied Physics

Year:

2005

Language:

english

File:

PDF, 383 KB

english, 2005

28

Electrical properties in free-standing GaN substrates fabricated by hydride vapor-phase epitaxy and self-separation technique

Oh, Dong-Cheol, Lee, Hyun-Jae, Ko, Hang-Ju, Jhun, Chul-Gyu

Journal:

Journal of the Korean Physical Society

Year:

2014

Language:

english

File:

PDF, 322 KB

english, 2014

29

Effects of Controlling the AZO Thin Film's Optical Band Gap on AZO/MEH-PPV Devices with Buffer Layer

Park, Jaehyoung, Jung, Ki-Chang, Lee, Ari, Bae, Hyojung, Mun, Daehwa, Ha, Jun-Seok, Mun, Young-Bu, Han, E. M., Ko, Hang-Ju

Journal:

International Journal of Photoenergy

Year:

2012

Language:

english

File:

PDF, 688 KB

english, 2012

30

Ultrafast Dynamics of Exciton–Exciton and Exciton–Longitudinal Optical-Phonon Scattering Processes in ZnO Epitaxial Thin Films

Takeda, Jun, Arai, Nobuyuki, Toshine, Yuki, Ko, Hang-Ju, Yao, Takafumi

Journal:

Japanese Journal of Applied Physics

Year:

2006

Language:

english

File:

PDF, 218 KB

english, 2006

31

Influence of growth temperature, working gas ratio, and buffer layer in ZnO films grown on (001) Si substrates by using rf-sputtering

Kim, Kang-Bok, Lee, Soo-Man, Oh, Dong-Cheol, Ko, Hang-Ju

Journal:

Journal of the Korean Physical Society

Year:

2015

Language:

english

File:

PDF, 2.09 MB

english, 2015

32

Control of crystal polarity in a wurtzite crystal: ZnO films grown by plasma-assisted molecular-beam epitaxy on GaN

Hong, Soon-Ku, Hanada, Takashi, Ko, Hang-Ju, Chen, Yefan, Yao, Takafumi, Imai, Daisuke, Araki, Kiyoaki, Shinohara, Makoto, Saitoh, Koh, Terauchi, Masami

Journal:

Physical Review B

Year:

2002

Language:

english

File:

PDF, 549 KB

english, 2002

33

Comprehensive Study about the Effect of Heat Treatment on the Electrical Properties of Single-Crystalline ZnO Materials

Oh, Dong-Cheol, Ko, Hang-Ju, Han, Seok-Kyu, Hong, Soon-Ku, Jeong, Weon-Guk, Yao, Takafumi

Journal:

Applied Physics Express

Year:

2012

Language:

english

File:

PDF, 302 KB

english, 2012

34

Surface, Structural, and Optical Properties in the ZnO Films Grown on Al 2 O 3 and GaN Substrates by Using RF-Sputtering

Ko, Hang-Ju, Kim, Kang-Bok, Lee, Soo-Man, Jang, Tae-Soo, Oh, Dong-Cheol

Journal:

Journal of Nanoscience and Nanotechnology

Year:

2017

Language:

english

File:

PDF, 13.61 MB

english, 2017