World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Materials Science 71 4151 4018 168 158 96 59773
Chemistry 69 6063 5503 349 318 91 58848

Brian C. O'Regan publications per year

The chart shows the history of publications by Brian C. O'Regan between 1990 and 2021, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Brian C. O'Regan published across 32 years, from 1990 to 2021, averaging 3 papers a year. Output peaked at 10 publications in 2010. 3 of the 96 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1990 to 2021. Vertical axis: number of publications, 0 to 10. Peak 10 publications in 2010. 1990: 1 publication 1991: 5 publications 1992: 0 publications 1993: 1 publication 1994: 0 publications 1995: 1 publication 1996: 1 publication 1997: 0 publications 1998: 1 publication 1999: 0 publications 2000: 1 publication 2001: 1 publication 2002: 3 publications 2003: 0 publications 2004: 0 publications 2005: 5 publications 2006: 5 publications 2007: 4 publications 2008: 9 publications 2009: 6 publications 2010: 10 publications 2011: 5 publications 2012: 8 publications 2013: 10 publications 2014: 4 publications 2015: 7 publications 2016: 2 publications 2017: 1 publication 2018: 2 publications 2019: 0 publications 2020: 2 publications 2021: 1 publication
1990 2021

96 publications in total across all disciplines

View publications per year as a table
Brian C. O'Regan: publications per year, 1990 to 2021
Year Publications
1990 1
1991 5
1992 0
1993 1
1994 0
1995 1
1996 1
1997 0
1998 1
1999 0
2000 1
2001 1
2002 3
2003 0
2004 0
2005 5
2006 5
2007 4
2008 9
2009 6
2010 10
2011 5
2012 8
2013 10
2014 4
2015 7
2016 2
2017 1
2018 2
2019 0
2020 2
2021 1
Total 96
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Brian C. O'Regan 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 Brian C. O'Regan 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, 90–109 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: 96 publications — 2nd percentile

2% 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 96
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766
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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Brian C. O'Regan 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 Brian C. O'Regan 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, 70–71 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: 71 D-Index — 68th percentile

68% 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
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378 71
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

Brian C. O'Regan is affiliated with Imperial College London in the United Kingdom. Their research spans multiple areas within engineering, focusing mainly on electrical and electronic engineering.

The scientist's work is closely associated with topics such as:

  • Perovskite Materials and Applications
  • Advanced battery technologies research
  • Chalcogenide Semiconductor Thin Films

O'Regan has contributed to published research in notable venues, including:

  • Advanced Energy Materials

Among their recent publications is the paper titled "Incorporating Electrochemical Halide Oxidation into Drift-Diffusion Models to Explain Performance Losses in Perovskite Solar Cells under Prolonged Reverse Bias", published in 2021 in Advanced Energy Materials.

This publication has received citations, indicating engagement from the scientific community in related fields.

Frequent collaborators with whom Brian C. O'Regan has co-authored research include:

  • Luca Bertoluzzi
  • Jay B. Patel
  • Kevin A. Bush
  • Caleb C. Boyd
  • Ross A. Kerner

Their work mainly integrates principles from electrical and electronic engineering to address challenges in energy materials and advanced battery technologies. This multidisciplinary approach supports ongoing developments in perovskite solar cell technology and semiconductor thin films.

Best Publications

  • A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films

    Brian O'Regan;Brian O'Regan;Michael Grätzel

  • Ionic transport in hybrid lead iodide perovskite solar cells

    Christopher Eames;Jarvist M. Frost;Piers R. F. Barnes;Brian C. O’Regan

  • Vectorial electron injection into transparent semiconductor membranes and electric field effects on the dynamics of light-induced charge separation

    Brian. O'Regan;Jacques. Moser;Marc. Anderson;Michael. Graetzel

  • Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis

    Philip Calado;Andrew M. Telford;Daniel Bryant;Xiaoe Li

  • The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

    Aurelien M A Leguy;Jarvist Moore Frost;Andrew P McMahon;Victoria Garcia Sakai

  • Electron Transfer Dynamics in Dye-Sensitized Solar Cells

    Andrea Listorti;Brian O’Regan;James R Durrant

  • Influence of the TiCl4 Treatment on Nanocrystalline TiO2 Films in Dye-Sensitized Solar Cells. 2. Charge Density, Band Edge Shifts, and Quantification of Recombination Losses at Short Circuit

    Brian C. O'regan;James R. Durrant;Paul M. Sommeling;Nicolaas J. Bakker

  • Parameters influencing the efficiency of electron injection in dye-sensitized solar cells.

    Sara E. Koops;Brian C. O’Regan;Piers R. F. Barnes;James R. Durrant

  • Kinetic and Energetic Paradigms for Dye-Sensitized Solar Cells: Moving from the Ideal to the Real

    Brian C. O’Regan;James R. Durrant

  • Experimental determination of the rate law for charge carrier decay in a polythiophene: Fullerene solar cell

    C. G. Shuttle;B. O’Regan;A. M. Ballantyne;J. Nelson

  • Electrodeposited Nanocomposite n–p Heterojunctions for Solid-State Dye-Sensitized Photovoltaics

    B. O’Regan;D. T. Schwartz;S. M. Zakeeruddin;M. Grätzel

  • Bimolecular recombination losses in polythiophene: Fullerene solar cells

    C. G. Shuttle;B. O’Regan;A. M. Ballantyne;J. Nelson

  • Recombination Dynamics as a Key Determinant of Open Circuit Voltage in Organic Bulk Heterojunction Solar Cells: A Comparison of Four Different Donor Polymers

    Andrea Maurano;Rick Hamilton;Chris G. Shuttle;Amy M. Ballantyne

  • Local field effects on electron transport in nanostructured TiO2 revealed by terahertz spectroscopy.

    E Hendry;M Koeberg;B O'Regan;M Bonn

  • Preparation of TiO2 (anatase) films on electrodes by anodic oxidative hydrolysis of TiCl3

    Ladislav Kavan;Brian O'Regan;Andreas Kay;Michael Grätzel

  • Influence of 4-Guanidinobutyric Acid as Coadsorbent in Reducing Recombination in Dye-Sensitized Solar Cells

    Zhipan Zhang;Shaik M. Zakeeruddin;Brian C. O'regan;Robin Humphry-Baker

  • Catalysis of recombination and its limitation on open circuit voltage for dye sensitized photovoltaic cells using phthalocyanine dyes.

    Brian C O'Regan;Ismael López-Duarte;M Victoria Martínez-Díaz;Amparo Forneli

  • Charge-density-based analysis of the current–voltage response of polythiophene/fullerene photovoltaic devices

    C G Shuttle;R Hamilton;B C O'Regan;Jenny Nelson

  • A Solid-State Dye-Sensitized Solar Cell Fabricated with Pressure-Treated P25−TiO2 and CuSCN: Analysis of Pore Filling and IV Characteristics

    Unknown

  • Immobilisation and bioelectrochemistry of proteins on nanoporous TiO2 and ZnO films

    Emmanuel Topoglidis;Anthony E.G Cass;Brian O'Regan;James R Durrant

  • Optoelectronic Studies of Methylammonium Lead Iodide Perovskite Solar Cells with Mesoporous TiO2: Separation of Electronic and Chemical Charge Storage, Understanding Two Recombination Lifetimes, and the Evolution of Band Offsets during J–V Hysteresis

    Brian C. O’Regan;Piers R. F. Barnes;Xiaoe Li;Chunhung Law

Frequent Co-Authors

Piers R. F. Barnes
Piers R. F. Barnes Imperial College London
James R. Durrant
James R. Durrant Imperial College London
Jenny Nelson
Jenny Nelson Imperial College London
Emilio Palomares
Emilio Palomares Institut Català d'Investigació Química
Michael D. McGehee
Michael D. McGehee University of Colorado Boulder
Tomás Torres
Tomás Torres Autonomous University of Madrid
Michael Grätzel
Michael Grätzel École Polytechnique Fédérale de Lausanne
Aron Walsh
Aron Walsh Imperial College London
Shaik M. Zakeeruddin
Shaik M. Zakeeruddin École Polytechnique Fédérale de Lausanne
Mohammad Khaja Nazeeruddin
Mohammad Khaja Nazeeruddin École Polytechnique Fédérale de Lausanne

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