World's Best Scientists 2026 revealed!
Keisuke Tajima

Keisuke Tajima

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Materials Science 58 7667 7411 422 407 233 12473
Chemistry 54 12546 11289 945 864 197 11219

Keisuke Tajima publications per year

The chart shows the history of publications by Keisuke Tajima between 1967 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Keisuke Tajima published across 59 years, from 1967 to 2025, averaging 4.8 papers a year. Output peaked at 18 publications in 2011. 15 of the 284 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1967 to 2025. Vertical axis: number of publications, 0 to 18. Peak 18 publications in 2011. 1967: 2 publications 1968: 0 publications 1969: 1 publication 1970: 0 publications 1971: 2 publications 1972: 0 publications 1973: 2 publications 1974: 2 publications 1975: 0 publications 1976: 4 publications 1977: 1 publication 1978: 0 publications 1979: 1 publication 1980: 3 publications 1981: 2 publications 1982: 1 publication 1983: 2 publications 1984: 0 publications 1985: 0 publications 1986: 1 publication 1987: 0 publications 1988: 0 publications 1989: 2 publications 1990: 3 publications 1991: 2 publications 1992: 1 publication 1993: 0 publications 1994: 1 publication 1995: 5 publications 1996: 2 publications 1997: 4 publications 1998: 3 publications 1999: 5 publications 2000: 5 publications 2001: 5 publications 2002: 1 publication 2003: 2 publications 2004: 1 publication 2005: 3 publications 2006: 5 publications 2007: 5 publications 2008: 7 publications 2009: 14 publications 2010: 7 publications 2011: 18 publications 2012: 12 publications 2013: 14 publications 2014: 10 publications 2015: 6 publications 2016: 9 publications 2017: 16 publications 2018: 14 publications 2019: 13 publications 2020: 11 publications 2021: 11 publications 2022: 11 publications 2023: 17 publications 2024: 7 publications 2025: 8 publications
1967 2025

284 publications in total across all disciplines

View publications per year as a table
Keisuke Tajima: publications per year, 1967 to 2025
Year Publications
1967 2
1968 0
1969 1
1970 0
1971 2
1972 0
1973 2
1974 2
1975 0
1976 4
1977 1
1978 0
1979 1
1980 3
1981 2
1982 1
1983 2
1984 0
1985 0
1986 1
1987 0
1988 0
1989 2
1990 3
1991 2
1992 1
1993 0
1994 1
1995 5
1996 2
1997 4
1998 3
1999 5
2000 5
2001 5
2002 1
2003 2
2004 1
2005 3
2006 5
2007 5
2008 7
2009 14
2010 7
2011 18
2012 12
2013 14
2014 10
2015 6
2016 9
2017 16
2018 14
2019 13
2020 11
2021 11
2022 11
2023 17
2024 7
2025 8
Total 284
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Keisuke Tajima publication distribution in Materials Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Materials Science in 2026. The highlighted bar marks where Keisuke Tajima sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 57 bars. Horizontal axis: publications, 50–69 to 1,163+. Vertical axis: number of scientists, 0 to 891. Most scientists, 891, have 190–209 publications. The last bar groups every scientist with 1,163 publications or more. The highlighted bar, 230–249 publications, is where this scientist sits. 50–69 publications: 28 scientists 70–89 publications: 152 scientists 90–109 publications: 356 scientists 110–129 publications: 487 scientists 130–149 publications: 723 scientists 150–169 publications: 835 scientists 170–189 publications: 850 scientists 190–209 publications: 891 scientists 210–229 publications: 862 scientists 230–249 publications: 766 scientists 250–269 publications: 726 scientists 270–289 publications: 665 scientists 290–309 publications: 593 scientists 310–329 publications: 537 scientists 330–349 publications: 477 scientists 350–369 publications: 440 scientists 370–389 publications: 356 scientists 390–409 publications: 321 scientists 410–429 publications: 256 scientists 430–449 publications: 246 scientists 450–469 publications: 216 scientists 470–489 publications: 212 scientists 490–509 publications: 174 scientists 510–529 publications: 194 scientists 530–549 publications: 162 scientists 550–569 publications: 131 scientists 570–589 publications: 111 scientists 590–609 publications: 103 scientists 610–629 publications: 99 scientists 630–649 publications: 77 scientists 650–669 publications: 92 scientists 670–689 publications: 56 scientists 690–709 publications: 53 scientists 710–729 publications: 53 scientists 730–749 publications: 38 scientists 750–769 publications: 52 scientists 770–789 publications: 43 scientists 790–809 publications: 38 scientists 810–829 publications: 34 scientists 830–849 publications: 25 scientists 850–869 publications: 18 scientists 870–889 publications: 20 scientists 890–909 publications: 24 scientists 910–929 publications: 27 scientists 930–949 publications: 20 scientists 950–969 publications: 17 scientists 970–989 publications: 10 scientists 990–1,009 publications: 16 scientists 1,010–1,029 publications: 13 scientists 1,030–1,049 publications: 12 scientists 1,050–1,069 publications: 9 scientists 1,070–1,089 publications: 8 scientists 1,090–1,109 publications: 7 scientists 1,110–1,129 publications: 9 scientists 1,130–1,149 publications: 2 scientists 1,150–1,162 publications: 5 scientists 1,163+ publications: 100 scientists
50–69 publications 1,163+

This scientist: 233 publications — 41st percentile

41% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,163 publications or more.

View publications distribution as a table
Number of Materials Science scientists by publication count, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
Publications Scientists This scientist
50–69 28
70–89 152
90–109 356
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766 233
250–269 726
270–289 665
290–309 593
310–329 537
330–349 477
350–369 440
370–389 356
390–409 321
410–429 256
430–449 246
450–469 216
470–489 212
490–509 174
510–529 194
530–549 162
550–569 131
570–589 111
590–609 103
610–629 99
630–649 77
650–669 92
670–689 56
690–709 53
710–729 53
730–749 38
750–769 52
770–789 43
790–809 38
810–829 34
830–849 25
850–869 18
870–889 20
890–909 24
910–929 27
930–949 20
950–969 17
970–989 10
990–1,009 16
1,010–1,029 13
1,030–1,049 12
1,050–1,069 9
1,070–1,089 8
1,090–1,109 7
1,110–1,129 9
1,130–1,149 2
1,150–1,162 5
1,163+ 100
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Keisuke Tajima D-index placement in Materials Science in 2026

The chart shows the D-index (discipline H-index) distribution of Materials Science scientists ranked by Research.com in 2026. The highlighted bar marks where Keisuke Tajima sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 64 bars. Horizontal axis: D-Index, 40–41 to 165+. Vertical axis: number of scientists, 0 to 667. Most scientists, 667, have 52–53 D-Index. The last bar groups every scientist with 165 D-Index or more. The highlighted bar, 58–59 D-Index, is where this scientist sits. 40–41 D-Index: 211 scientists 42–43 D-Index: 450 scientists 44–45 D-Index: 612 scientists 46–47 D-Index: 612 scientists 48–49 D-Index: 598 scientists 50–51 D-Index: 657 scientists 52–53 D-Index: 667 scientists 54–55 D-Index: 621 scientists 56–57 D-Index: 597 scientists 58–59 D-Index: 610 scientists 60–61 D-Index: 587 scientists 62–63 D-Index: 606 scientists 64–65 D-Index: 533 scientists 66–67 D-Index: 490 scientists 68–69 D-Index: 469 scientists 70–71 D-Index: 378 scientists 72–73 D-Index: 421 scientists 74–75 D-Index: 359 scientists 76–77 D-Index: 323 scientists 78–79 D-Index: 299 scientists 80–81 D-Index: 230 scientists 82–83 D-Index: 210 scientists 84–85 D-Index: 195 scientists 86–87 D-Index: 203 scientists 88–89 D-Index: 175 scientists 90–91 D-Index: 175 scientists 92–93 D-Index: 142 scientists 94–95 D-Index: 121 scientists 96–97 D-Index: 117 scientists 98–99 D-Index: 107 scientists 100–101 D-Index: 88 scientists 102–103 D-Index: 85 scientists 104–105 D-Index: 68 scientists 106–107 D-Index: 62 scientists 108–109 D-Index: 57 scientists 110–111 D-Index: 45 scientists 112–113 D-Index: 49 scientists 114–115 D-Index: 50 scientists 116–117 D-Index: 34 scientists 118–119 D-Index: 38 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 28 scientists 126–127 D-Index: 24 scientists 128–129 D-Index: 33 scientists 130–131 D-Index: 28 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 20 scientists 136–137 D-Index: 23 scientists 138–139 D-Index: 17 scientists 140–141 D-Index: 12 scientists 142–143 D-Index: 17 scientists 144–145 D-Index: 21 scientists 146–147 D-Index: 13 scientists 148–149 D-Index: 11 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 13 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 4 scientists 162–163 D-Index: 4 scientists 164 D-Index: 3 scientists 165+ D-Index: 98 scientists
40–41 D-Index 165+

This scientist: 58 D-Index — 41st percentile

41% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 165 D-Index or more.

View D-Index distribution as a table
Number of Materials Science scientists by D-index, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
D-Index Scientists This scientist
40–41 211
42–43 450
44–45 612
46–47 612
48–49 598
50–51 657
52–53 667
54–55 621
56–57 597
58–59 610 58
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378
72–73 421
74–75 359
76–77 323
78–79 299
80–81 230
82–83 210
84–85 195
86–87 203
88–89 175
90–91 175
92–93 142
94–95 121
96–97 117
98–99 107
100–101 88
102–103 85
104–105 68
106–107 62
108–109 57
110–111 45
112–113 49
114–115 50
116–117 34
118–119 38
120–121 37
122–123 29
124–125 28
126–127 24
128–129 33
130–131 28
132–133 21
134–135 20
136–137 23
138–139 17
140–141 12
142–143 17
144–145 21
146–147 13
148–149 11
150–151 14
152–153 13
154–155 9
156–157 10
158–159 7
160–161 4
162–163 4
164 3
165+ 98
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Overview

What is he best known for?

The fields of study he is best known for:

  • Organic chemistry
  • Polymer
  • Semiconductor

His main research concerns Polymer, Polymer chemistry, Polymer solar cell, Copolymer and Energy conversion efficiency. His Polymer research includes elements of Thiophene, Acceptor and Nanostructure. His work carried out in the field of Polymer chemistry brings together such families of science as Lamellar structure, Amphiphile, Polymerization and Alkyl.

His studies in Polymer solar cell integrate themes in fields like Fullerene, Electron donor, Diimide and Organic solar cell. The concepts of his Copolymer study are interwoven with issues in Donor acceptor and Carbazole. His work on Heterojunction is typically connected to Open-circuit voltage as part of general Optoelectronics study, connecting several disciplines of science.

His most cited work include:

  • All-polymer solar cells from perylene diimide based copolymers: material design and phase separation control. (352 citations)
  • Synthesis and Photovoltaic Properties of Diketopyrrolopyrrole-Based Donor−Acceptor Copolymers (265 citations)
  • Efficient Charge Collection with ZnO Nanorod Array in Hybrid Photovoltaic Devices (253 citations)

What are the main themes of his work throughout his whole career to date?

His scientific interests lie mostly in Polymer, Organic solar cell, Polymer chemistry, Polymer solar cell and Optoelectronics. His Polymer research incorporates elements of Thiophene, Electron mobility and Nanotechnology. Keisuke Tajima combines subjects such as Chemical physics, Acceptor, Substrate, Fullerene and Photochemistry with his study of Organic solar cell.

His study in Polymer chemistry is interdisciplinary in nature, drawing from both Copolymer, Absorption spectroscopy, Polymerization and Monomer. His Polymer solar cell research integrates issues from Band gap and Electron acceptor. His work in the fields of Optoelectronics, such as Organic semiconductor, overlaps with other areas such as Open-circuit voltage and Field-effect transistor.

He most often published in these fields:

  • Polymer (39.42%)
  • Organic solar cell (39.90%)
  • Polymer chemistry (28.85%)

What were the highlights of his more recent work (between 2015-2021)?

  • Organic solar cell (39.90%)
  • Polymer (39.42%)
  • Optoelectronics (24.04%)

In recent papers he was focusing on the following fields of study:

Keisuke Tajima mainly investigates Organic solar cell, Polymer, Optoelectronics, Nanotechnology and Organic semiconductor. Keisuke Tajima interconnects Chemical physics, Acceptor, Polymer solar cell, Fullerene and Photochemistry in the investigation of issues within Organic solar cell. His Acceptor research is multidisciplinary, relying on both Heterojunction and Band gap.

Polymer solar cell is a subfield of Energy conversion efficiency that Keisuke Tajima investigates. His Polymer study integrates concerns from other disciplines, such as Crystallinity, Polymer chemistry and Alkyl. Keisuke Tajima focuses mostly in the field of Optoelectronics, narrowing it down to topics relating to Electrode and, in certain cases, Charge carrier.

Between 2015 and 2021, his most popular works were:

  • Self-powered ultra-flexible electronics via nano-grating-patterned organic photovoltaics. (251 citations)
  • Simultaneously Achieved High Open‐Circuit Voltage and Efficient Charge Generation by Fine‐Tuning Charge‐Transfer Driving Force in Nonfullerene Polymer Solar Cells (99 citations)
  • Conjugated materials containing dithieno[3,2-b:2′,3′-d]pyrrole and its derivatives for organic and hybrid solar cell applications (58 citations)

In his most recent research, the most cited papers focused on:

  • Organic chemistry
  • Polymer
  • Semiconductor

His primary areas of study are Organic solar cell, Acceptor, Heterojunction, Thin film and Optoelectronics. His Organic solar cell research is multidisciplinary, incorporating perspectives in Side chain, Diimide, Polymer solar cell and Photochemistry. The study of Energy conversion efficiency and Polymer are components of his Polymer solar cell research.

Polymer and Polymer chemistry are commonly linked in his work. His work in Acceptor tackles topics such as Band gap which are related to areas like Exciton and Cascade. His Responsivity and Flexible electronics study in the realm of Optoelectronics connects with subjects such as Electric Power Supplies and Transistor.

Best Publications

  • Self-powered ultra-flexible electronics via nano-grating-patterned organic photovoltaics.

    Sungjun Park;Sungjun Park;Soo Won Heo;Wonryung Lee;Daishi Inoue

  • All-polymer solar cells from perylene diimide based copolymers: material design and phase separation control.

    Erjun Zhou;Junzi Cong;Qingshuo Wei;Keisuke Tajima

  • Efficient Charge Collection with ZnO Nanorod Array in Hybrid Photovoltaic Devices

    Kazuko Takanezawa;Kouske Hirota;Qing-Shuo Wei;Keisuke Tajima

  • Synthesis and Photovoltaic Properties of Diketopyrrolopyrrole-Based Donor−Acceptor Copolymers

    Erjun Zhou;Shimpei Yamakawa;Keisuke Tajima;Chunhe Yang

  • Self‐Organized Buffer Layers in Organic Solar Cells

    Qingshuo Wei;Takeshi Nishizawa;Keisuke Tajima;Kazuhito Hashimoto

  • Tailoring organic heterojunction interfaces in bilayer polymer photovoltaic devices

    Akira Tada;Yanfang Geng;Yanfang Geng;Qingshuo Wei;Kazuhito Hashimoto

  • Synthesis of all-conjugated diblock copolymers by quasi-living polymerization and observation of their microphase separation.

    Yue Zhang;Keisuke Tajima;Kouske Hirota;Kazuhito Hashimoto

  • Synthesis and Photovoltaic Properties of a Novel Low Band Gap Polymer Based on N-Substituted Dithieno[3,2-b:2',3'-d]pyrrole

    Erjun Zhou;Motoshi Nakamura;Takeshi Nishizawa;Yue Zhang

  • Independent Tuning of the Band Gap and Redox Potential of Graphene Quantum Dots.

    Xin Yan;Binsong Li;Xiao Cui;Qingshuo Wei

  • Morphological Stabilization of Polymer Photovoltaic Cells by Using Cross-Linkable Poly(3-(5-hexenyl)thiophene)

    Shoji Miyanishi;Keisuke Tajima;Kazuhito Hashimoto

  • Template synthesis of polypyrrole nanofibers insulated within one-dimensional silicate channels: hexagonal versus lamellar for recombination of polarons into bipolarons.

    Midori Ikegame;Keisuke Tajima;Takuzo Aida

  • Control of Miscibility and Aggregation Via the Material Design and Coating Process for High‐Performance Polymer Blend Solar Cells

    Erjun Zhou;Junzi Cong;Kazuhito Hashimoto;Keisuke Tajima;Keisuke Tajima

  • Diketopyrrolopyrrole-Based Semiconducting Polymer for Photovoltaic Device with Photocurrent Response Wavelengths up to 1.1 μm

    Erjun Zhou;Qingshuo Wei;Shimpei Yamakawa;Yue Zhang

  • Efficiency enhancement of polymer photovoltaic devices hybridized with ZnO nanorod arrays by the introduction of a vanadium oxide buffer layer

    Kazuko Takanezawa;Keisuke Tajima;Kazuhito Hashimoto

  • Simultaneously Achieved High Open-Circuit Voltage and Efficient Charge Generation by Fine-Tuning Charge-Transfer Driving Force in Nonfullerene Polymer Solar Cells

    Ailing Tang;Bo Xiao;Yuming Wang;Feng Gao

  • Self-assembly and luminescence of oligo(p-phenylene vinylene) amphiphiles.

    James F. Hulvat;Marina Sofos;Keisuke Tajima;Samuel I. Stupp

  • Controlled polymerizations with constrained geometries

    Keisuke Tajima;Takuzo Aida

  • Fullerene attached all-semiconducting diblock copolymers for stable single-component polymer solar cells

    Shoji Miyanishi;Yue Zhang;Keisuke Tajima;Kazuhito Hashimoto

  • Design and Synthesis of TiO2 Nanorod Assemblies and Their Application for Photovoltaic Devices

    Qingshuo Wei;Kouske Hirota;Keisuke Tajima;Kazuhito Hashimoto

  • Synthesis and Photovoltaic Properties of Donor−Acceptor Copolymers Based on 5,8-Dithien-2-yl-2,3-diphenylquinoxaline

    Erjun Zhou;Junzi Cong;Keisuke Tajima;Kazuhito Hashimoto

  • Nanostructure Formation in Poly(3-hexylthiophene-block-3-(2-ethylhexyl)thiophene)s

    Yue Zhang;Keisuke Tajima;Kazuhito Hashimoto

Frequent Co-Authors

Kazuhito Hashimoto
Kazuhito Hashimoto National Institute for Materials Science
Erjun Zhou
Erjun Zhou National Center for Nanoscience and Technology, China
Takao Someya
Takao Someya University of Tokyo
Takuzo Aida
Takuzo Aida University of Tokyo
Kazuo Takimiya
Kazuo Takimiya Tohoku University
Kenjiro Fukuda
Kenjiro Fukuda Osaka University
Hiroshi Segawa
Hiroshi Segawa University of Tokyo
Chain-Shu Hsu
Chain-Shu Hsu National Yang Ming Chiao Tung University
Itaru Osaka
Itaru Osaka Hiroshima University

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