Dr Geoffrey Dunn

Dr Geoffrey Dunn The University of Aberdeen School of Natural & Computing Sciences Senior Lecturer work +44 (0)1224 272805 pref g.m.dunn@abdn.ac.uk

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Biography

Senior Lecturer in theoretical physics in the Department 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.

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Publications

Contributions to Journals

Articles

• Dunn, GM. (2012). 'Reduction of Impact Ionization in GaAs-Based Planar Gunn Diodes by Anode Contact Design'. IEEE Transactions on Electron Devices, vol 59, no. 3, pp. 654-660.
  [Online] DOI: 10.1109/TED.2011.2177094
• Li, C., Khalid, A., Paluchowski Caldwell, SH., Dunn, GM., Holland, MC. & Cumming, DRS. (2011). 'Enhancement of power and frequency in Planar Gunn diodes by introducing extra delta-doping layers'. Microwave and Optical Technology Letters, vol 53, no. 7, pp. 1624-1626.
  [Online] DOI: 10.1002/mop.26071
• Dunn, GM. (2011). 'Design, Fabrication and characterization of Planar Gunn diodes'. solid state electronics, vol 64, no. 1, pp. 67-72.
• Dunn, GM. (2011). 'Novel composite contact design and fabrication for planar Gunn devices for millimeter-wave and terahertz frequencies'. physica status solidi (c).
• Li, C., Khalid, A., Pilgrim, N., Holland, MC., Dunn, G. & Cumming, DRS. (2009). 'Novel planar Gunn diode operating in fundamental mode up to 158 GHz'. Journal of Physics: Conference Series, vol 193, no. 1, pp. 012029.
  [Online] DOI: 10.1088/1742-6596/193/1/012029
• Pilgrim, NJ., Macpherson, RF., Khalid, A., Dunn, GM. & Cumming, DRS. (2009). 'Multiple and broad frequency response Gunn diodes'. Semiconductor Science and Technology, vol 24, no. 10, pp. 105010.
  [Online] DOI: 10.1088/0268-1242/24/10/105010
• Strachan, NJC., Gormley, FJ., Rotariu, O., Ogden, ID., Miller, G., Dunn, GM., Sheppard, SK., Dallas, JF., Reid, T., Howie, H., Maiden, MCJ. & Forbes, KJ. (2009). 'Attribution of Campylobacter Infections in Northeast Scotland to Specific Sources by Use of Multilocus Sequence Typing'. Journal of Infectious Diseases, vol 199, no. 8, pp. 1205-1208.
  [Online] DOI: 10.1086/597417
• Pilgrim, NJ., Khalid, A., Dunn, GM. & Cumming, DRS. (2008). 'Gunn oscillations in planar heterostructure diodes'. Semiconductor Science and Technology, vol 23, no. 7, pp. 075013.
  [Online] DOI: 10.1088/0268-1242/23/7/075013
• Macpherson, RF., Dunn, GM. & Pilgrim, NJ. (2008). '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'. Semiconductor Science and Technology, vol 23, no. 5, pp. 055005.
  [Online] DOI: 10.1088/0268-1242/23/5/055005
• Khalid, A., Pilgrim, NJ., Dunn, GM., Holland, MC., Stanley, CR., Thayne, IG. & Cumming, DRS. (2007). 'A Planar Gunn Diode Operating Above 100 GHz'. IEEE Electron Device Letters, vol 28, no. 10, pp. 849-851.
  [Online] DOI: 10.1109/LED.2007.904218
• Khalid, A., Dunn, GM., Pilgrim, NJ., Stanley, CR., Thayne, IG., Holland, M. & Cumming, DRS. (2007). 'Planar Gunn-type triode oscillator at 83 GHz'. Electronics Letters, vol 43, no. 15, pp. 837-838.
  [Online] DOI: 10.1049/el:20071099
• Strachan, NJC., Dunn, GM., Locking, ME., Reid, TM. & Ogden, ID. (2006). 'Escherichia coli O157: Burger bug or environmental pathogen?'. International Journal of Food Microbiology, vol 112, no. 2, pp. 129-137.
  [Online] DOI: 10.1016/j.ijfoodmicro.2006.06.021
• Miller, G., Dunn, GM., Reid, TM., Ogden, ID. & Strachan, NJC. (2005). 'Does age acquired immunity confer selective protection to common serotypes of Campylobacter jejuni?'. BMC Infectious Diseases, vol 5, no. 66.
• Dunn, GM., Teoh, YP., Priestley, N. & Carr, M. (2005). 'Monte Carlo simulations of asymmetry multiple transit region Gunn diodes'. Semiconductor Science and Technology, vol 20, no. 5, pp. 418-422.
  [Online] DOI: 10.1088/0268-1242/20/5/016
• Dunn, GM., Miller, G. & Reid, TM. (2005). 'Does age acuired immunity confer selective protection to common serotypes of Campylobacter jejuni?'. BMC Infectious Diseases, vol 5.
  [Online] DOI: 10.1186/1471-2334-5-66
• Dunn, GM., Miller, G. & Smith-Palmer, A. (2004). 'Human campybacteriosis in Scotland: seasonality, regional trends and bursts of infection'. Epidemiology and Infection, vol 132, no. 4, pp. 585-593.
  [Online] DOI: 10.1017/S0950268804002572
• Teoh, YP., Dunn, GM., MacKenzie, IS. & Priestley, N. (2004). 'A Novel Hybrid IMPATT-Gunn Device'. Semiconductor Science and Technology, vol 19, no. 7, pp. 885-889.
  [Online] DOI: 10.1088/0268-1242/19/7/018
• Dunn, GM. & Kearney, MJ. (2003). 'A theoretical study of differing active region doping profiles for W-band (75-110 GHz) InP Gunn diodes'. Semiconductor Science and Technology, vol 18, no. 8, pp. 794-802.
  [Online] DOI: 10.1088/0268-1242/18/8/313
• Dunn, GM. & Teoh, YP. (2002). 'Multiple Transit Region Gunn Diodes'. Electronics Letters, vol 38.
  [Online] DOI: 10.1049/el:20020127
• Hambleton, PJ., Plimmer, SA., David, JR., Rees, GJ. & Dunn, GM. (2002). 'Simulated current response in avalanche photodiodes'. Journal of Physics D: Applied Physics, vol 91, no. 4, pp. 2107-2111.
  [Online] DOI: 10.1063/1.1432122
• Teoh, YP., Dunn, GM., Priestley, N. & Carr, M. (2002). 'Monte Carlo Modelling of multiple-transit-region Gunn diodes'. Semiconductor Science and Technology, vol 17, pp. 1090-1095.
  [Online] DOI: 10.1088/0268-1242/17/10/310
• Dunn, GM. & Phillips, A. (2001). 'Gunn instabilities in power HEMTs'. Electronics Letters, vol 37, pp. 530-531.
  [Online] DOI: 10.1049/el:20010362
• Dunn, GM. & Phillips, A. (2001). 'Current instabilities in power HEMTs'. Semiconductor Science and Technology, vol 16, pp. 562-566.
  [Online] DOI: 10.1088/0268-1242/16/7/306

Abstracts

• Strachan, NJC., Miller, G., Dunn, GM., Reid, T., Ogden, ID., Sproston, EL., Gormley, FJ., Yiu, TT., Forbes, KJ., Dallas, JF., Sheppard, SK., Maiden, MC., Williams, A., MacRae, M. & Rotariu, O. (2007). 'Are Environmental Sources of Campylobacter Important for Human Infection? A CaMPS Study'. Zoonoses and Public Health, vol 54, no. Supplement s1, pp. 40-40.
  [Online] DOI: 10.1111/j.1863-2378.2007.01053.x

Contributions to Conferences

Posters

• Pilgrim, NJ., Khalid, A., Dunn, GM. & Cumming, DRS. (2009). 'Planar Gunn-effect devices'. UK Semiconductors 2009, Sheffield, United Kingdom, 1/07/09 - 2/07/09,.

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