Takeyoshi Onuma

7.1k total citations · 2 hit papers
115 papers, 5.9k citations indexed

About

Takeyoshi Onuma is a scholar working on Materials Chemistry, Electronic, Optical and Magnetic Materials and Condensed Matter Physics. According to data from OpenAlex, Takeyoshi Onuma has authored 115 papers receiving a total of 5.9k indexed citations (citations by other indexed papers that have themselves been cited), including 74 papers in Materials Chemistry, 68 papers in Electronic, Optical and Magnetic Materials and 62 papers in Condensed Matter Physics. Recurrent topics in Takeyoshi Onuma's work include ZnO doping and properties (69 papers), Ga2O3 and related materials (67 papers) and GaN-based semiconductor devices and materials (61 papers). Takeyoshi Onuma is often cited by papers focused on ZnO doping and properties (69 papers), Ga2O3 and related materials (67 papers) and GaN-based semiconductor devices and materials (61 papers). Takeyoshi Onuma collaborates with scholars based in Japan, United States and Germany. Takeyoshi Onuma's co-authors include Shigefusa F. Chichibu, M. Kawasaki, Atsushi Tsukazaki, Akira Ohtomo, Tomohiro Yamaguchi, Masatomo Sumiya, Y. Segawa, Keita Ohtani, Hideo Ohno and T. Makino and has published in prestigious journals such as The Journal of Chemical Physics, Nature Materials and Applied Physics Letters.

In The Last Decade

Takeyoshi Onuma

113 papers receiving 5.8k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Repeated temperature modulation epitaxy for p-type doping and light-emitting diode based on ZnO

2004 1.8k citations Akira Ohtomo, Takeyoshi Onuma et al. Nature Materials profile →
Origin of defect-insensitive emission probability in In-containing (Al,In,Ga)N alloy semiconductors

2006 553 citations Shigefusa F. Chichibu, Akira Uedono et al. Nature Materials profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Takeyoshi Onuma Japan	31	4.3k	3.3k	2.1k	2.0k	830	115	5.9k
Vanya Darakchieva Sweden	34	3.2k 0.7×	1.9k 0.6×	1.6k 0.8×	1.8k 0.9×	745 0.9×	188	4.9k
Filip Tuomisto Finland	37	3.6k 0.8×	1.8k 0.6×	1.3k 0.6×	2.4k 1.2×	610 0.7×	233	5.1k
Renat Sabirianov United States	31	2.8k 0.6×	2.0k 0.6×	688 0.3×	1.2k 0.6×	1.3k 1.6×	113	4.4k
Vincent G. Harris United States	46	5.5k 1.3×	5.8k 1.8×	705 0.3×	1.8k 0.9×	2.0k 2.4×	254	8.1k
Jenh‐Yih Juang Taiwan	30	2.3k 0.5×	1.1k 0.3×	653 0.3×	1.4k 0.7×	515 0.6×	245	3.7k
Qingfeng Zhan China	31	2.9k 0.7×	2.7k 0.8×	603 0.3×	1.1k 0.5×	1.4k 1.7×	150	4.5k
F. Sánchez Spain	40	4.7k 1.1×	3.5k 1.1×	1.5k 0.7×	2.2k 1.1×	609 0.7×	258	6.2k
Jean‐Luc Maurice France	36	2.8k 0.6×	1.5k 0.5×	677 0.3×	1.6k 0.8×	1.3k 1.5×	155	4.3k
P. F. Carcia United States	32	2.9k 0.7×	2.0k 0.6×	1.0k 0.5×	3.4k 1.7×	2.6k 3.1×	84	6.2k
F. Rivadulla Spain	35	2.4k 0.6×	3.4k 1.0×	2.7k 1.3×	559 0.3×	322 0.4×	152	4.7k

Countries citing papers authored by Takeyoshi Onuma

Since Specialization

Citations

This map shows the geographic impact of Takeyoshi Onuma'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 Takeyoshi Onuma with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Takeyoshi Onuma more than expected).

Fields of papers citing papers by Takeyoshi Onuma

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Takeyoshi Onuma. 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 Takeyoshi Onuma. The network helps show where Takeyoshi Onuma may publish in the future.

Co-authorship network of co-authors of Takeyoshi Onuma

This figure shows the co-authorship network connecting the top 25 collaborators of Takeyoshi Onuma. A scholar is included among the top collaborators of Takeyoshi Onuma 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 Takeyoshi Onuma. Takeyoshi Onuma is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Onuma, Takeyoshi, et al.. (2025). Strain-induced band-gap widening in (100) β−Ga2O3 thin films grown on θ−Al2O3 buffer layers. Physical Review Materials. 9(3).

Mou, Shin, Thaddeus J. Asel, Adam T. Neal, et al.. (2024). Epitaxial growth of α-(AlxGa1−x)2O3 by suboxide molecular-beam epitaxy at 1 µm/h. APL Materials. 12(4). 9 indexed citations

Kobayashi, Go, Tomohiro Yamaguchi, Tohru Honda, et al.. (2024). Rocksalt-structured MgZnO-based UV-C lamp emitting in 190–220 nm spectral range using 146 nm line of Kr₂* generated by dielectric barrier discharge. Applied Physics Express. 17(12). 121001–121001. 1 indexed citations

Nagai, Hiroki, et al.. (2024). Deposition of ZnO and Al-doped ZnO thin films using pressed-sintered targets. Physica B Condensed Matter. 698. 416733–416733. 1 indexed citations

Ota, Yuichi, Kentaro Kaneko, Takeyoshi Onuma, & Shizυo Fujita. (2024). Bandgap engineering of spinel-structured oxide semiconductor alloys. Journal of Physics D Applied Physics. 57(25). 255108–255108. 3 indexed citations

Onuma, Takeyoshi, Mizuki Ono, Kohei Shima, et al.. (2023). Steady-state and dynamic characteristics of deep UV luminescence in rock salt-structured MgxZn1−xO. Journal of Applied Physics. 134(2). 4 indexed citations

Ota, Yuichi, Tomohiro Yamaguchi, Tohru Honda, et al.. (2023). Realization of cathodoluminescence in the 180 nm spectral range by suppressing thermal stress in mist chemical vapor deposition of rocksalt-structured MgZnO films. Japanese Journal of Applied Physics. 63(2). 02SP30–02SP30. 2 indexed citations

Kaneko, Kentaro, Ken Goto, Takeyoshi Onuma, et al.. (2023). Growth of α-In₂O₃ films with different concentrations of In₂O₃ powder used as source precursor by mist chemical vapor deposition. Japanese Journal of Applied Physics. 62(SF). SF1023–SF1023. 1 indexed citations

Ota, Yuichi, Kentaro Kaneko, Takeyoshi Onuma, & Shizυo Fujita. (2023). Natural band alignment of MgO1−xSx alloys. AIP Advances. 13(5). 1 indexed citations

10.

Onuma, Takeyoshi, Kohei Sasaki, Tomohiro Yamaguchi, et al.. (2021). Selective observation of transverse optical phonons of Au modes to evaluate free charge carrier parameters in β -Ga2O3 substrate and homoepitaxial film. Applied Physics Letters. 118(25). 2 indexed citations

11.

Sekiguchi, Atsushi, Kentaro Kaneko, Shizυo Fujita, et al.. (2021). Mist Chemical Vapor Deposition Growth of α‐In₂O₃ Films Using Indium Oxide Powder as Source Precursor. physica status solidi (b). 259(2). 8 indexed citations

12.

Kaneko, Kentaro, et al.. (2021). Vacuum Ultraviolet Emission Properties of Rocksalt‐Structured MgZnO Microcrystals Prepared on Quartz Glass Substrates. physica status solidi (b). 259(2). 2 indexed citations

13.

Jinno, Riena, Celesta S. Chang, Takeyoshi Onuma, et al.. (2021). Crystal orientation dictated epitaxy of ultrawide-bandgap 5.4- to 8.6-eV α-(AlGa) ₂ O ₃ on m-plane sapphire. Science Advances. 7(2). 107 indexed citations

14.

Onuma, Takeyoshi, Yuichi Ota, Tomohiro Yamaguchi, et al.. (2021). Identification of free and bound exciton emission of MgO single crystal in vacuum ultraviolet spectral range. Applied Physics Letters. 119(13). 12 indexed citations

15.

Wong, Man Hoi, et al.. (2021). Effect of thermal annealing on photoexcited carriers in nitrogen-ion-implanted β-Ga2O3 crystals detected by photocurrent measurement. AIP Advances. 11(3). 6 indexed citations

16.

Yamaguchi, Tomohiro, Hiroki Nagai, Takanori Kiguchi, et al.. (2020). Epitaxial mist chemical vapor deposition growth and characterization of Cu₃N films on (0001)α-Al₂O₃ substrates. Applied Physics Express. 13(7). 75505–75505. 2 indexed citations

17.

Yamaguchi, Tomohiro, Takanori Kiguchi, Atsushi Sekiguchi, et al.. (2020). Impact of hydrochloric acid on the epitaxial growth of In₂O₃ films on (0001)α-Al₂O₃ substrates by mist CVD. Applied Physics Express. 13(7). 75504–75504. 9 indexed citations

18.

Yamaguchi, Tomohiro, Takuo Sasaki, Masamitu Takahasi, et al.. (2019). In Situ Synchrotron X-ray Diffraction Reciprocal Space Mapping Measurements in the RF-MBE Growth of GaInN on GaN and InN. Crystals. 9(12). 631–631. 5 indexed citations

19.

Onuma, Takeyoshi, et al.. (2014). 分子性前駆体法で作製したGa-In-O多結晶薄膜に関する陰極線ルミネセンススペクトル. Japanese Journal of Applied Physics. 53. 1–5. 3 indexed citations

20.

Chichibu, Shigefusa F., Akira Uedono, Takeyoshi Onuma, et al.. (2006). Origin of defect-insensitive emission probability in In-containing (Al,In,Ga)N alloy semiconductors. Nature Materials. 5(10). 810–816. 553 indexed citations breakdown →

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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