Hang-Ju Ko

1.9k total citations
41 papers, 1.6k citations indexed

About

Hang-Ju Ko is a scholar working on Materials Chemistry, Electronic, Optical and Magnetic Materials and Condensed Matter Physics. According to data from OpenAlex, Hang-Ju Ko has authored 41 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Materials Chemistry, 28 papers in Electronic, Optical and Magnetic Materials and 20 papers in Condensed Matter Physics. Recurrent topics in Hang-Ju Ko's work include ZnO doping and properties (33 papers), Ga2O3 and related materials (27 papers) and GaN-based semiconductor devices and materials (19 papers). Hang-Ju Ko is often cited by papers focused on ZnO doping and properties (33 papers), Ga2O3 and related materials (27 papers) and GaN-based semiconductor devices and materials (19 papers). Hang-Ju Ko collaborates with scholars based in Japan, South Korea and United States. Hang-Ju Ko's co-authors include Takafumi Yao, Soon‐Ku Hong, Yefan Chen, Yusaburo Segawa, Takashi Hanada, N. T. Tuan, Hisao Makino, Sunghoon Song, Takhee Lee and Dae‐Kue Hwang and has published in prestigious journals such as Nano Letters, Physical review. B, Condensed matter and Applied Physics Letters.

In The Last Decade

Hang-Ju Ko

41 papers receiving 1.6k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Hang-Ju Ko Japan 20 1.5k 900 711 382 160 41 1.6k
Jeff Nause United States 19 1.6k 1.1× 881 1.0× 846 1.2× 263 0.7× 96 0.6× 42 1.7k
Bill Nemeth United States 16 1.2k 0.8× 651 0.7× 874 1.2× 179 0.5× 106 0.7× 35 1.5k
M. Dworzak Germany 12 1.7k 1.2× 941 1.0× 934 1.3× 211 0.6× 120 0.8× 20 1.9k
Yungryel Ryu United States 13 2.1k 1.4× 1.2k 1.3× 1.3k 1.8× 257 0.7× 97 0.6× 16 2.2k
F. Hosseini Téhérani France 17 860 0.6× 599 0.7× 363 0.5× 458 1.2× 149 0.9× 85 1.1k
Yutaka Adachi Japan 20 920 0.6× 451 0.5× 630 0.9× 219 0.6× 140 0.9× 94 1.2k
U. Haboeck Germany 17 2.4k 1.6× 1.3k 1.5× 1.3k 1.9× 426 1.1× 211 1.3× 29 2.6k
W.C. Harsch United States 12 1.7k 1.2× 783 0.9× 1.1k 1.5× 195 0.5× 132 0.8× 16 1.9k
Zhengwu Jin Japan 13 2.5k 1.7× 1.4k 1.5× 866 1.2× 269 0.7× 66 0.4× 16 2.6k
David J. Rogers France 17 846 0.6× 604 0.7× 383 0.5× 372 1.0× 142 0.9× 84 1.1k

Countries citing papers authored by Hang-Ju Ko

Since Specialization
Citations

This map shows the geographic impact of Hang-Ju Ko's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hang-Ju Ko with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hang-Ju Ko more than expected).

Fields of papers citing papers by Hang-Ju Ko

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hang-Ju Ko. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hang-Ju Ko. The network helps show where Hang-Ju Ko may publish in the future.

Co-authorship network of co-authors of Hang-Ju Ko

This figure shows the co-authorship network connecting the top 25 collaborators of Hang-Ju Ko. A scholar is included among the top collaborators of Hang-Ju Ko based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hang-Ju Ko. Hang-Ju Ko is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Ko, Hang-Ju, et al.. (2017). Surface, Structural, and Optical Properties in the ZnO Films Grown on Al2O3 and GaN Substrates by Using RF-Sputtering. Journal of Nanoscience and Nanotechnology. 17(5). 3272–3278. 1 indexed citations
2.
Ko, Hang-Ju, et al.. (2015). Dependence of Substrate Temperature and Working Gas Ratio in ZnO Films Grown on (001) GaAs Substrates by RF-Sputtering. Journal of Nanoelectronics and Optoelectronics. 11(2). 250–255. 2 indexed citations
3.
Oh, D. C., et al.. (2014). Electrical properties in free-standing GaN substrates fabricated by hydride vapor-phase epitaxy and self-separation technique. Journal of the Korean Physical Society. 65(10). 1696–1700. 2 indexed citations
4.
Oh, D. C., et al.. (2012). Comprehensive Study about the Effect of Heat Treatment on the Electrical Properties of Single-Crystalline ZnO Materials. Applied Physics Express. 5(7). 75801–75801. 3 indexed citations
5.
Ko, Hang-Ju, Hyojin Kim, Chaehwan Jeong, et al.. (2011). Investigation of high-quality CuInSe2 films with various Cu/In ratios. Journal of Crystal Growth. 322(1). 91–94. 10 indexed citations
6.
Cho, Yong‐Hoon, et al.. (2011). Excitonic transition dynamics on front and back surfaces of ZnO thin films. Physical Review B. 84(20). 5 indexed citations
7.
Lee, Woong, Siyoung Kim, Hang-Ju Ko, et al.. (2008). Molecular beam epitaxy of GaSb on ZnTe/GaAs: Influence of the chemical composition of ZnTe surface. Applied Surface Science. 254(23). 7728–7732. 2 indexed citations
8.
Lee, Woong, Mina Jung, Hongchan Lee, et al.. (2007). Structural deformation reduction of ZnTe heteroepitaxial layers grown on GaAs (001) substrates by using low-temperature buffer. Journal of Crystal Growth. 304(1). 22–25. 6 indexed citations
9.
Takeda, Jun, et al.. (2006). Ultrafast Dynamics of Exciton–Exciton and Exciton–Longitudinal Optical-Phonon Scattering Processes in ZnO Epitaxial Thin Films. Japanese Journal of Applied Physics. 45(9R). 6961–6961. 15 indexed citations
10.
Ishida, Akihiro, Y. Inoue, H. Fujiyasu, et al.. (2005). Design and Preparation of AlN/GaN Quantum Wells for Quantum Cascade Laser Applications. Japanese Journal of Applied Physics. 44(8R). 5918–5918. 10 indexed citations
11.
Chen, Yefan, Hang-Ju Ko, Soon‐Ku Hong, Takafumi Yao, & Yusaburo Segawa. (2002). Morphology evolution of ZnO(000 1) surface during plasma-assisted molecular-beam epitaxy. Applied Physics Letters. 80(8). 1358–1360. 52 indexed citations
12.
Ko, Hang-Ju, et al.. (2002). A challenge in molecular beam epitaxy of ZnO: control of material properties by interface engineering. Thin Solid Films. 409(1). 153–160. 33 indexed citations
13.
Ko, Hang-Ju, Takafumi Yao, Yefan Chen, & Soon‐Ku Hong. (2002). Investigation of ZnO epilayers grown under various Zn/O ratios by plasma-assisted molecular-beam epitaxy. Journal of Applied Physics. 92(8). 4354–4360. 115 indexed citations
14.
Chen, Yefan, N. T. Tuan, Yusaburo Segawa, et al.. (2001). Stimulated emission and optical gain in ZnO epilayers grown by plasma-assisted molecular-beam epitaxy with buffers. Applied Physics Letters. 78(11). 1469–1471. 162 indexed citations
15.
Hong, Soon‐Ku, Takashi Hanada, Hisao Makino, et al.. (2001). Band alignment at a ZnO/GaN (0001) heterointerface. Applied Physics Letters. 78(21). 3349–3351. 119 indexed citations
16.
Hong, Soon‐Ku, Takashi Hanada, Hisao Makino, et al.. (2001). ZnO epilayers on GaN templates: Polarity control and valence-band offset. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena. 19(4). 1429–1433. 27 indexed citations
17.
Hong, Soon‐Ku, Hang-Ju Ko, Yefan Chen, Takashi Hanada, & Takafumi Yao. (2000). Evolution of initial layers of plasma-assisted MBE grown ZnO on (0001)GaN/sapphire. Journal of Crystal Growth. 214-215. 81–86. 23 indexed citations
18.
Chen, Yefan, Hang-Ju Ko, Soon‐Ku Hong, & Takafumi Yao. (2000). Layer-by-layer growth of ZnO epilayer on Al2O3(0001) by using a MgO buffer layer. Applied Physics Letters. 76(5). 559–561. 231 indexed citations
19.
Chen, Yefan, et al.. (2000). Plasma-assisted molecular beam epitaxy for ZnO based II–VI semiconductor oxides and their heterostructures. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena. 18(3). 1514–1517. 27 indexed citations
20.
Hong, Soon‐Ku, Hang-Ju Ko, Yefan Chen, & Takafumi Yao. (2000). Defect characterization in epitaxial ZnO/epi-GaN/Al2O3 heterostructures: transmission electron microscopy and triple-axis X-ray diffractometry. Journal of Crystal Growth. 209(2-3). 537–541. 40 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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