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Dr Geoffrey Dunn

Dr Geoffrey Dunn
Dr Geoffrey Dunn
Dr Geoffrey Dunn

Senior Lecturer

About

Biography

Head of physics. After his first degree in astrophysics, he obtained a PhD in Positron physics at London University in 1990. Since then he has developed an extensive suite of semiconductor device Monte Carlo simulation software and has researched into photodetectors, impact ionisation and Gunn oscillators working at Helsinki, Norwich, Sheffield and Loughborough Universities. Currently he is working to develop a planar Gunn diode technology for the generation of T-Rays (THz frequency radiation) and investigate novel cooling methods for semiconductor devices.

Publications

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  • Investigation of THz Frequency Shaped Anode Planar Gunn Diodes Operating in Delayed Mode

    Mindil, A., Dunn, G., Khalid, A., Oxley, C.
    IEEE Journal of the Electron Devices Society, vol. 8, pp. 1072-1075
    Contributions to Journals: Articles

  • Investigation of High-Frequency Fine Structure in the Current Output of Shaped Contact Planar Gunn Diodes

    Dunn, G., Mindil, A. M. H., Khalid, A., Oxley, C.
    IEEE Transactions on Electron Devices, vol. 67, no. 5, pp. 1946-1951
    Contributions to Journals: Articles

  • Investigation of Contact Edge Effects in the Channel of Planar Gunn Diodes

    Mindil, A., Dunn, G. M., Khalid, A., Oxley, C. H.
    IEEE Transactions on Electron Devices, vol. 67, no. 1, pp. 53-56
    Contributions to Journals: Articles

  • Investigating the role of band offset on the property and op-eration of the potential well barrier diodes

    Akura, M., Dunn, G.
    physica status solidi (c), vol. 256, no. 5, 1800284
    Contributions to Journals: Articles

  • Hot electron effects on the operation of potential well barrier diodes

    Akura, M., Dunn, G., Missous, M.
    Journal of Semiconductors, vol. 40, no. 12, 122101
    Contributions to Journals: Articles

  • An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator

    Maricar, M. I., Khalid, A., Dunn, G., Greedy, S., Thomas, D., Cumming, D. R. S., Oxley, C. H.
    Microwave and Optical Technology Letters, vol. 60, no. 9, pp. 2144-2148
    Contributions to Journals: Articles

  • Comparative Study of Heterosturcture Barrier Diodes in the GaAs/AlGaAs System

    Akura, M., Dunn, G., Missous, M.
    International Journal of Materials Science and Applications, vol. 7, no. 4, pp. 161-166
    Contributions to Journals: Articles

  • Investigating effect of temperature on barrier height of PWB diodes

    Akura, M., Dunn, G. M.
    Electronics Letters, vol. 54, no. 1, pp. 42-43
    Contributions to Journals: Articles

  • A Hybrid Planar-Doped Potential-Well Barrier Diode for Detector Applications

    Akura, M., Dunn, G., Missous, M.
    IEEE Transactions on Electron Devices, vol. 64, no. 10, pp. 4031-4035
    Contributions to Journals: Articles

  • GaAs/AlGaAs potential well barrier diodes: Novel diode for detector and mixer applications

    Akura, M., Dunn, G., Sexton, J., Missous, M.
    physica status solidi (c), vol. 214, no. 10, 1700290
    Contributions to Journals: Articles

  • Thermal Profiles Within the Channel of Planar Gunn Diodes Using Micro-Particle Sensors

    Glover, J., Khalid, A., Cumming, D., Dunn, G. M., Kuball, M., Bajo, M. M., Oxley, C. H.
    IEEE Electron Device Letters, vol. 38, no. 9, pp. 1325-1327
    Contributions to Journals: Articles

  • Potential Well Barrier Diodes for Submillimeter Wave and High Frequency Applications

    Akura, M., Dunn, G., Missous, M., Sexton, J.
    IEEE Electron Device Letters, vol. 38, no. 4, pp. 438-440
    Contributions to Journals: Articles

  • Micro-coolers fabricated as a component in an integrated circuit

    Glover, J., Khalid, A., Stephen, A., Dunn, G., Cumming, D., Oxley, C. H.
    Semiconductor Science and Technology, vol. 30, no. 1, 015005
    Contributions to Journals: Articles

  • Experimentally estimated dead space for GaAs and InP based planar Gunn diodes

    Maricar, M. I., Khalid, A., Dunn, G., Cumming, D., Oxley, C. H.
    Semiconductor Science and Technology, vol. 30, no. 1, 114502
    Contributions to Journals: Articles

  • On wafer thermal characterization of miniature gallium arsenide microcoolers with thermal loading from DC probes

    Glover, J., Khalid, A., Cumming, D. R. S., Bajo, M. M., Kuball, M., Stephen, A., Dunn, G. M., Oxley, C. H.
    Microwave and Optical Technology Letters, vol. 56, no. 11, pp. 2699-2700
    Contributions to Journals: Articles

  • Terahertz oscillations in an In0.53Ga0.47As submicron planar Gunn diode

    Khalid, A., Dunn, G. M., Macpherson, R. F., Thoms, S., Macintyre, D., Li, C., Steer, M. J., Papageorgiou, V., Thayne, I. G., Kuball, M., Oxley, C. H., Montes Bajo, M., Stephen, A., Glover, J., Cumming, D. R. S.
    Journal of Applied Physics, vol. 115, no. 11, 114502
    Contributions to Journals: Articles

  • Micro-cooler Enhancements by Barrier Interface Analysis

    Stephen, A., Dunn, G. M., Glover, J., Oxley, C. H., Bajo, M. M., Cumming, D. R. S., Khalid, A., Kuball, M.
    AIP Advances, vol. 4, no. 2, 027105
    Contributions to Journals: Articles

  • Improvements in thermionic cooling through engineering of the heterostructure interface using Monte Carlo simulations

    Stephen, A., Dunn, G. M., Oxley, C. H., Glover, J., Montes Bajo, M., Cumming, D. R. S., Khalid, A., Kuball, M.
    Journal of Applied Physics, vol. 114, no. 4, 043717
    Contributions to Journals: Articles

  • Impact ionisation electroluminescence in planar GaAs-based heterostructure Gunn diodes: Spatial distribution and impact of doping non-uniformities

    Montes Bajo, M., Dunn, G., Stephen, A., Khalid, A., Cumming, D., Oxley, C., Glover, J., Kuball, M.
    Journal of Physics D: Applied Physics, vol. 113, no. 12, 124505
    Contributions to Journals: Articles

  • A 218-GHz second-harmonic multiquantum well GaAs-based planar Gunn diodes

    Khalid, A., Li, C., Papageorgiou, V., Pilgrim, N. J., Dunn, G. M., Cumming, D. R. S.
    Microwave and Optical Technology Letters, vol. 55, no. 3, pp. 686-688
    Contributions to Journals: Articles

  • InGaAs planar gunn diodes operating at a fundamental frequency of 164 GHz

    Khalid, A., Li, C., Papageogiou, V., Dunn, G. M., Steer, M. J., Thayne, I. G., Kuball, M., Oxley, C. H., Montes Bajo, M., Stephen, A., Glover, J., Cumming, D. R. S.
    IEEE Electron Device Letters, vol. 34, no. 1, pp. 39-41
    Contributions to Journals: Articles

  • Reduction of impact ionization in GaAs-based planar Gunn diodes by anode contact design

    Montes, M., Dunn, G., Stephen, A., Khalid, A., Li, C., Cumming, D., Oxley, C., Hopper, R., Kuball, M.
    IEEE Transactions on Electron Devices, vol. 59, no. 3, pp. 654-660
    Contributions to Journals: Articles

  • Design, fabrication and characterization of In0.23Ga0.77As-channel planar Gunn diodes for millimeter wave applications

    Li, C., Khalid, A., Paluchowski Caldwell, S. H., Holland, M. C., Dunn, G. M., Thayne, I. G., Cumming, D. R. S.
    Solid State Electronics, vol. 64, no. 1, pp. 67-72
    Contributions to Journals: Articles

  • Enhancement of power and frequency in Planar Gunn diodes by introducing extra delta-doping layers

    Li, C., Khalid, A., Paluchowski Caldwell, S. H., Dunn, G. M., Holland, M. C., Cumming, D. R. S.
    Microwave and Optical Technology Letters, vol. 53, no. 7, pp. 1624-1626
    Contributions to Journals: Articles

  • Novel composite contact design and fabrication for planar Gunn devices for millimeter-wave and terahertz frequencies

    Khalid, A., Li, C., Pilgrim, N. J., Holland, M. C., Dunn, G. M., Cumming, D. R. S.
    physica status solidi (c), vol. 8, no. 2, pp. 316-318
    Contributions to Journals: Articles

  • Multiple and broad frequency response Gunn diodes

    Pilgrim, N. J., Macpherson, R. F., Khalid, A., Dunn, G. M., Cumming, D. R. S.
    Semiconductor Science and Technology, vol. 24, no. 10, 105010
    Contributions to Journals: Articles

  • Planar Gunn-effect devices

    Pilgrim, N. J., Khalid, A., Dunn, G. M., Cumming, D. R. S.
    UK Semiconductors 2009
    Contributions to Conferences: Posters

  • Attribution of Campylobacter infections in northeast Scotland to specific sources by use of multilocus sequence typing

    Strachan, N. J. C., Gormley, F. J., Rotariu, O., Ogden, I. D., Miller, G., Dunn, G. M., Sheppard, S. K., Dallas, J. F., Reid, T. M. S., Howie, H., Maiden, M. C. J., Forbes, K. J.
    The journal of infectious diseases, vol. 199, no. 8, pp. 1205-1208
    Contributions to Journals: Articles

  • Novel planar Gunn diode operating in fundamental mode up to 158 GHz

    Li, C., Khalid, A., Pilgrim, N., Holland, M. C., Dunn, G., Cumming, D. R. S.
    Journal of Physics: Conference Series, vol. 193, no. 1, 012029
    Contributions to Journals: Articles

  • The use of doping spikes in GaN Gunn diodes

    Macpherson, R. F., Dunn, G. M.
    Applied Physics Letters, vol. 93, no. 6, 062103
    Contributions to Journals: Articles

  • Gunn oscillations in planar heterostructure diodes

    Pilgrim, N. J., Khalid, A., Dunn, G. M., Cumming, D. R. S.
    Semiconductor Science and Technology, vol. 23, no. 7, 075013
    Contributions to Journals: Articles

  • Simulation of gallium nitride Gunn diodes at various doping levels and temperatures for frequencies up to 300 GHz by Monte Carlo simulation, and incorporating the effects of thermal heating

    Macpherson, R. F., Dunn, G. M., Pilgrim, N. J.
    Semiconductor Science and Technology, vol. 23, no. 5, 055005
    Contributions to Journals: Articles

  • Are Environmental Sources of Campylobacter Important for Human Infection? A CaMPS Study

    Strachan, N. J. C., Miller, G., Dunn, G. M., Reid, T., Ogden, I. D., Sproston, E. L., Gormley, F. J., Yiu, T. T., Forbes, K. J., Dallas, J. F., Sheppard, S. K., Maiden, M. C., Williams, A., MacRae, M., Rotariu, O.
    Zoonoses and Public Health, vol. 54, no. Supplement s1, pp. 40-40
    Contributions to Journals: Abstracts

  • Planar Gunn-type triode oscillator at 83 GHz

    Khalid, A., Dunn, G. M., Pilgrim, N. J., Stanley, C. R., Thayne, I. G., Holland, M., Cumming, D. R. S.
    Electronics Letters, vol. 43, no. 15, pp. 837-838
    Contributions to Journals: Articles

  • Double transit region Gunn diodes

    Lau, K. S., Tozer, R. C., David, J. P. R., Hopkinson, M., Rees, G. J., Carr, M., Priestley, N., Teoh, Y. P., Dunn, G. M.
    Semiconductor Science and Technology, vol. 22, no. 3, pp. 245-248
    Contributions to Journals: Articles

  • A Planar Gunn Diode Operating Above 100 GHz

    Khalid, A., Pilgrim, N. J., Dunn, G. M., Holland, M. C., Stanley, C. R., Thayne, I. G., Cumming, D. R. S.
    IEEE Electron Device Letters, vol. 28, no. 10, pp. 849-851
    Contributions to Journals: Articles

  • Escherichia coli O157: Burger bug or environmental pathogen?

    Strachan, N. J. C., Dunn, G. M., Locking, M. E., Reid, T. M., Ogden, I. D.
    International Journal of Food Microbiology, vol. 112, no. 2, pp. 129-137
    Contributions to Journals: Articles

  • Does age acquired immunity confer selective protection to common serotypes of Campylobacter jejuni?

    Miller, G., Dunn, G. M., Reid, T. M. S., Ogden, I. D., Strachan, N. J. C.
    BMC Infectious Diseases, vol. 5, 66
    Contributions to Journals: Articles

  • Monte Carlo simulations of asymmetry multiple transit region Gunn diodes

    Dunn, G. M., Teoh, Y. P., Priestley, N., Carr, M.
    Semiconductor Science and Technology, vol. 20, no. 5, pp. 418-422
    Contributions to Journals: Articles

  • A Novel Hybrid IMPATT-Gunn Device

    Teoh, Y. P., Dunn, G. M., MacKenzie, I. S., Priestley, N.
    Semiconductor Science and Technology, vol. 19, no. 7, pp. 885-889
    Contributions to Journals: Articles

  • Human campybacteriosis in Scotland: seasonality, regional trends and bursts of infection

    Dunn, G. M., Miller, G., Smith-Palmer, A.
    Epidemiology and Infection, vol. 132, no. 4, pp. 585-593
    Contributions to Journals: Articles

  • A theoretical study of differing active region doping profiles for W-band (75-110 GHz) InP Gunn diodes

    Dunn, G. M., Kearney, M. J.
    Semiconductor Science and Technology, vol. 18, no. 8, pp. 794-802
    Contributions to Journals: Articles

  • Simulated current response in avalanche photodiodes

    Hambleton, P. J., Plimmer, S. A., David, J. R., Rees, G. J., Dunn, G. M.
    Journal of Physics D: Applied Physics, vol. 91, no. 4, pp. 2107-2111
    Contributions to Journals: Articles

  • Monte Carlo Modelling of multiple-transit-region Gunn diodes

    Teoh, Y. P., Dunn, G. M., Priestley, N., Carr, M.
    Semiconductor Science and Technology, vol. 17, pp. 1090-1095
    Contributions to Journals: Articles

  • Multiple Transit Region Gunn Diodes

    Dunn, G. M., Teoh, Y. P.
    Electronics Letters, vol. 38
    Contributions to Journals: Articles

  • Current instabilities in power HEMTs

    Dunn, G. M., Phillips, A.
    Semiconductor Science and Technology, vol. 16, pp. 562-566
    Contributions to Journals: Articles

  • Gunn instabilities in power HEMTs

    Dunn, G. M., Phillips, A.
    Electronics Letters, vol. 37, pp. 530-531
    Contributions to Journals: Articles

  • Monte Carlo simulation of high-field transport and impact ionization in AlGaAs p(+)in(+) diodes

    Dunn, G. M., Ghin, R., Rees, G. J., David, J. P. R., Plimmer, S., Herbert, D. C.
    Semiconductor Science and Technology, vol. 14, pp. 994-1000
    Contributions to Journals: Articles

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