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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 76 4184 3797 233 219 150 24899

Kohjiro Hara publications per year

The chart shows the history of publications by Kohjiro Hara between 1994 and 2022, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kohjiro Hara published across 29 years, from 1994 to 2022, averaging 5.8 papers a year. Output peaked at 12 publications in 2000. 5 of the 167 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1994 to 2022. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 2000. 1994: 1 publication 1995: 4 publications 1996: 1 publication 1997: 6 publications 1998: 4 publications 1999: 2 publications 2000: 12 publications 2001: 9 publications 2002: 6 publications 2003: 12 publications 2004: 9 publications 2005: 8 publications 2006: 12 publications 2007: 9 publications 2008: 3 publications 2009: 11 publications 2010: 11 publications 2011: 6 publications 2012: 8 publications 2013: 7 publications 2014: 6 publications 2015: 6 publications 2016: 4 publications 2017: 2 publications 2018: 3 publications 2019: 0 publications 2020: 0 publications 2021: 4 publications 2022: 1 publication
1994 2022

167 publications in total across all disciplines

View publications per year as a table
Kohjiro Hara: publications per year, 1994 to 2022
Year Publications
1994 1
1995 4
1996 1
1997 6
1998 4
1999 2
2000 12
2001 9
2002 6
2003 12
2004 9
2005 8
2006 12
2007 9
2008 3
2009 11
2010 11
2011 6
2012 8
2013 7
2014 6
2015 6
2016 4
2017 2
2018 3
2019 0
2020 0
2021 4
2022 1
Total 167
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Kohjiro Hara publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Kohjiro Hara sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 141–160 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 150 publications — 14th percentile

14% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218 150
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Kohjiro Hara D-index placement in Chemistry in 2026

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

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 76–77 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 76 D-Index — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437 76
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Kohjiro Hara is affiliated with the National Institute of Advanced Industrial Science and Technology in Japan. Their research primarily focuses on engineering and energy, with substantial contributions to electrical and electronic engineering as well as renewable energy, sustainability, and environmental engineering.

The research topics covered by Hara include:

  • Photovoltaic System Optimization Techniques
  • Silicon and Solar Cell Technologies
  • Thin-Film Transistor Technologies
  • Photovoltaic Systems and Sustainability
  • Solar cell performance optimization
  • TiO2 Photocatalysis and Solar Cells
  • Transition Metal Oxide Nanomaterials

Hara has published extensively in the following venues:

  • Journal of Photochemistry and Photobiology A Chemistry
  • Japanese Journal of Applied Physics
  • Journal of the Ceramic Society of Japan

Recent publications include:

  • "Spectroscopic investigation of long-term outdoor-exposed crystalline silicon photovoltaic modules" (2020), Journal of Photochemistry and Photobiology A Chemistry
  • "Raman spectroscopic analysis of encapsulants in aged photovoltaic modules" (2021), Journal of Photochemistry and Photobiology A Chemistry
  • "Durable polyolefin encapsulants in aged photovoltaic modules" (2022), Journal of Photochemistry and Photobiology A Chemistry
  • "Durable crystalline silicon photovoltaic modules based on breathable structure" (2020), Japanese Journal of Applied Physics

Hara has collaborated frequently with several researchers, including:

  • Yasuo Chiba
  • Yasushi Shirahige
  • Hiromichi Ichinose
  • Mitsunori Yada

Best Publications

  • Molecular Design of Coumarin Dyes for Efficient Dye-Sensitized Solar Cells

    Kohjiro Hara;Tadatake Sato;Ryuzi Katoh;Akihiro Furube

  • Ultrafast plasmon-induced electron transfer from gold nanodots into TiO2 nanoparticles.

    Akihiro Furube;Luchao Du;Kohjiro Hara;Ryuzi Katoh

  • Alkyl-functionalized organic dyes for efficient molecular photovoltaics.

    Nagatoshi Koumura;Zhong-Sheng Wang;Shogo Mori;Masanori Miyashita

  • Design of new coumarin dyes having thiophene moieties for highly efficient organic-dye-sensitized solar cells

    Kohjiro Hara;Mitsuhiko Kurashige;Yasufumi Dan-oh;Chiaki Kasada

  • A High‐Light‐Harvesting‐Efficiency Coumarin Dye for Stable Dye‐Sensitized Solar Cells

    Zhong-Sheng Wang;Yan Cui;Kohjiro Hara;Yasufumi Dan-Oh

  • Highly efficient photon-to-electron conversion with mercurochrome-sensitized nanoporous oxide semiconductor solar cells

    Kohjiro Hara;Takaro Horiguchi;Tohru Kinoshita;Kazuhiro Sayama

  • A coumarin-derivative dye sensitized nanocrystalline TiO2 solar cell having a high solar-energy conversion efficiency up to 5.6%

    Kohjiro Hara;Kazuhiro Sayama;Yasuyo Ohga;Akira Shinpo

  • Hexylthiophene-Functionalized Carbazole Dyes for Efficient Molecular Photovoltaics: Tuning of Solar-Cell Performance by Structural Modification

    Zhong-Sheng Wang;Nagatoshi Koumura;Yan Cui;Masabumi Takahashi

  • Thiophene-Functionalized Coumarin Dye for Efficient Dye-Sensitized Solar Cells: Electron Lifetime Improved by Coadsorption of Deoxycholic Acid

    Zhong-Sheng Wang, ,†;Yan Cui;‡ Yasufumi Dan-oh;Chiaki Kasada

  • Efficiencies of Electron Injection from Excited N3 Dye into Nanocrystalline Semiconductor (ZrO2, TiO2, ZnO, Nb2O5, SnO2, In2O3) Films

    Ryuzi Katoh;Akihiro Furube;Toshitada Yoshihara;Kohjiro Hara

  • Oligothiophene-containing coumarin dyes for efficient dye-sensitized solar cells.

    Kohjiro Hara;† Zhong-Sheng Wang;Tadatake Sato;Akihiro Furube

  • Effect of additives on the photovoltaic performance of coumarin-dye-sensitized nanocrystalline TiO2 solar cells.

    Kohjiro Hara;Yasufumi Dan-oh;Chiaki Kasada;Yasuyo Ohga

  • Identification of Reactive Species in Photoexcited Nanocrystalline TiO2 Films by Wide-Wavelength-Range (400−2500 nm) Transient Absorption Spectroscopy

    Toshitada Yoshihara;Ryuzi Katoh;Akihiro Furube;Yoshiaki Tamaki

  • Photoelectrochemical Properties of J Aggregates of Benzothiazole Merocyanine Dyes on a Nanostructured TiO2 Film

    Kazuhiro Sayama;Shingo Tsukagoshi;Kohjiro Hara;Yasuyo Ohga

  • Novel conjugated organic dyes for efficient dye-sensitized solar cells

    K. Hara;T. Sato;R. Katoh;A. Furube

  • Photosensitization of a porous TiO2 electrode with merocyanine dyes containing a carboxyl group and a long alkyl chain

    Kazuhiro Sayama;Kohjiro Hara;Nahoko Mori;Makoto Satsuki

  • Efficient sensitization of nanocrystalline TiO2 films with cyanine and merocyanine organic dyes

    Kazuhiro Sayama;Shingo Tsukagoshi;Tohru Mori;Kohjiro Hara

  • Photophysical and (photo)electrochemical properties of a coumarin dye.

    Zhong-Sheng Wang;Kohjiro Hara;Yasufumi Dan-oh;Chiaki Kasada

  • Electrochemical reduction of carbon dioxide under high pressure on various electrodes in an aqueous electrolyte

    Kohjiro Hara;Akihiko Kudo;Tadayoshi Sakata

  • Novel polyene dyes for highly efficient dye-sensitized solar cells.

    Kohjiro Hara;Mitsuhiko Kurashige;Shunichiro Ito;Akira Shinpo

Frequent Co-Authors

Ryuzi Katoh
Ryuzi Katoh Nihon University
Akihiro Furube
Akihiro Furube University of Tokushima
Kazuhiro Sayama
Kazuhiro Sayama National Institute of Advanced Industrial Science and Technology
Hideki Sugihara
Hideki Sugihara National Institute of Advanced Industrial Science and Technology
Masatoshi Yanagida
Masatoshi Yanagida National Institute for Materials Science
Ashraful Islam
Ashraful Islam National Institute for Materials Science
Hironori Arakawa
Hironori Arakawa Tokyo University of Science
Zhigang Zhao
Zhigang Zhao Chinese Academy of Sciences
Masahiro Miyauchi
Masahiro Miyauchi Tokyo Institute of Technology
Atsunori Mori
Atsunori Mori Kobe University

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