World's Best Scientists 2026 revealed!
Helge Lemmetyinen

Helge Lemmetyinen

D-Index & Metrics

Chemistry

D-Index
61
Citations
13398
World Ranking
9231
National Ranking
47

Helge Lemmetyinen 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 Helge Lemmetyinen sits on this spectrum.

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 publications 1,295+

This scientist: 381 publications — 78th percentile

78% of scientists in this discipline score the same or lower.

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

Helge Lemmetyinen 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 Helge Lemmetyinen sits on this spectrum.

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 D-Index 159+

This scientist: 61 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

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

Overview

Helge Lemmetyinen is affiliated with Tampere University in Finland. Their research focuses primarily on materials science and engineering, exploring various aspects of electronic, optical, and magnetic materials as well as electrical and electronic engineering. The scientific contributions of Helge Lemmetyinen encompass several interconnected subfields and topics.

The scientist's main fields of study include:

  • Materials Science
  • Engineering

Specific subfields of research cover:

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Helge Lemmetyinen's work addresses several important research topics, including:

  • Perovskite Materials and Applications
  • Nonlinear Optical Materials Research
  • Organic and Molecular Conductors Research

Their recent published work includes a paper titled Electron transfer in oriented donor-acceptor dyads, intralayer charge migration, and formation of interlayer charge separated states in multi-layered Langmuir-Schäfer films, published in 2020 in the journal Physical Chemistry Chemical Physics. This paper has attracted citations and contributes to the understanding of complex charge transfer mechanisms in multi-layered molecular films.

Helge Lemmetyinen has collaborated with several researchers throughout their career. Frequent co-authors include:

  • А. S. Alekseev
  • Alexander Efimov
  • Vladimir Chukharev
  • A. B. Ivanov

The primary venue for Helge Lemmetyinen's publications is Physical Chemistry Chemical Physics, reflecting a focus on physical chemistry and chemical physics domains.

Best Publications

  • Electron-transfer state of 9-mesityl-10-methylacridinium ion with a much longer lifetime and higher energy than that of the natural photosynthetic reaction center.

    Shunichi Fukuzumi;Hiroaki Kotani;Kei Ohkubo;Seiji Ogo

  • Photoinduced Electron Transfer in Phytochlorin-(60)Fullerene Dyads

    Nikolai V. Tkachenko;Lasse Rantala;Andrei Y. Tauber;Juho Helaja

  • An Extremely Small Reorganization Energy of Electron Transfer in Porphyrin−Fullerene Dyad

    Hiroshi Imahori;Nikolai V. Tkachenko;Visa Vehmanen;Koichi Tamaki

  • Charge separation in a nonfluorescent donor-acceptor dyad derived from boron dipyrromethene dye, leading to photocurrent generation.

    Shigeki Hattori;Kei Ohkubo;Yasuteru Urano;Hisato Sunahara

  • Self-assembled hydrophobin protein films at the air-water interface: Structural analysis and molecular engineering

    Géza R. Szilvay;Arja Paananen;Katri Laurikainen;Elina Vuorimaa

  • Ultrafast Photodynamics of Exciplex Formation and Photoinduced Electron Transfer in Porphyrin−Fullerene Dyads Linked at Close Proximity

    Nikolai V. Tkachenko;Helge Lemmetyinen;Junko Sonoda;Kei Ohkubo

  • Charge-transfer emission of compact porphyrin-fullerene dyad analyzed by Marcus theory of electron-transfer.

    Visa Vehmanen;Nikolai V. Tkachenko;Hiroshi Imahori;Shunichi Fukuzumi

  • Exciplex Intermediates in Photoinduced Electron Transfer of Porphyrin−Fullerene Dyads

    Tero J. Kesti;Nikolai V. Tkachenko;Visa Vehmanen;Hiroko Yamada

  • Effects of meso-Diarylamino Group of Porphyrins as Sensitizers in Dye-Sensitized Solar Cells on Optical, Electrochemical, and Photovoltaic Properties

    Hiroshi Imahori;Yusuke Matsubara;Hiroaki Iijima;Tomokazu Umeyama

  • Structural hierarchy in molecular films of two class II hydrophobins

    Arja Paananen;Elina Vuorimaa;Mika Torkkeli;Merja Penttilä

  • 1,7- And 1,6-Regioisomers of Diphenoxy and Dipyrrolidinyl Substituted Perylene Diimides: Synthesis, Separation, Characterization, and Comparison of Electrochemical and Optical Properties†

    Rajeev K. Dubey;Alexander Efimov;Helge Lemmetyinen

  • Cross-linking kinetics and swelling behaviour of aliphatic polyurethane

    S. Li;R. Vatanparast;H. Lemmetyinen

  • Azobenzene-linked porphyrin-fullerene dyads.

    David I. Schuster;Ke Li;Dirk M. Guldi;Amit Palkar

  • Nonlinear-optical activity and biomolecular chirality

    Thierry Verbiest;Martti Kauranen;Andre Persoons;Marjo Ikonen

  • Photosynthetic Antenna−Reaction Center Mimicry: Sequential Energy- and Electron Transfer in a Self-assembled Supramolecular Triad Composed of Boron Dipyrrin, Zinc Porphyrin and Fullerene

    Eranda Maligaspe;Nikolai V. Tkachenko;Navaneetha K. Subbaiyan;Raghu Chitta

  • Photoinduced charge and energy transfer in phthalocyanine-functionalized gold nanoparticles

    Anne Kotiaho;Riikka Lahtinen;Alexander Efimov;Hanna Kaisa Metsberg

  • Fe2O3-TiO2 Nano-heterostructure Photoanodes for Highly Efficient Solar Water Oxidation

    Davide Barreca;Giorgio Carraro;Alberto Gasparotto;Chiara Maccato

  • Energy and electron transfer in β-alkynyl-linked porphyrin-[60]fullerene dyads

    Sean A. Vail;David I. Schuster;Dirk M. Guldi;Marja Isosomppi

  • Near infra-red emission of charge-transfer complexes of porphyrin–fullerene films

    Nikolay V. Tkachenko;Claudia Guenther;Hiroshi Imahori;Koichi Tamaki

  • Tuning the ground-state and excited-state interchromophore interactions in porphyrin-fullerene π-stacks

    Vladimir Chukharev;Nikolai V. Tkachenko;Alexander Efimov;Dirk M. Guldi

Frequent Co-Authors

Nikolai V. Tkachenko
Nikolai V. Tkachenko Tampere University
Hiroshi Imahori
Hiroshi Imahori Kyoto University
Tomokazu Umeyama
Tomokazu Umeyama Kyoto University
Shunichi Fukuzumi
Shunichi Fukuzumi Osaka University
Yoshihiro Matano
Yoshihiro Matano Niigata University
Kei Ohkubo
Kei Ohkubo Osaka University
Francis D'Souza
Francis D'Souza University of North Texas
Mircea Guina
Mircea Guina Tampere University
M. Pessa
M. Pessa Tampere University
Seiji Isoda
Seiji Isoda Kyoto University

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