Browsing by Author "Dunn, G. M."

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    Improvements in thermionic cooling through engineering of the heterostructure interface using Monte Carlo simulations
    (AIP Publishing LLC, 2013-07-30) Stephen, A.; Dunn, G. M.; Oxley, C. H.; Glover, James; Montes, Miguel; Cumming, D. R. S.; Khalid, A.; Kuball, M.
    A self-consistent Ensemble Monte Carlo (EMC) model was developed to simulate the thermionic effect in heterostructure barrier coolers. The model was validated on an InGaAs-InGaAsP heterostructure device of variable barrier height and width, producing good quantitative agreement with previous literature results. The operation of the cooler was found to be a complex and intricate process depending on the field, conduction band and details of barrier structure. When applied to a GaAs-AlGaAs micro-cooler there was good agreement with the experimental results. Importantly, very small alterations in the barrier structure were found to lead to considerable changes in device performance
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    In0.53Ga0.47As Planar Gunn Diodes Operating at a Fundamental Frequency of 164 GHz
    (IEEE, 2013) Khalid, A.; Li, C.; Papageogiou, V.; Dunn, G. M.; Steer, M. J.; Thayne, I. G,; Kuball, M.; Oxley, C. H.; Montes, Miguel; Stephen, A.; Glover, James; Cumming, D. R. S.
    We present the first results of a planar Gunn diode made in In0.53Ga0.47As on an InP substrate, operating at a fundamental frequency up to 164 GHz. For a 120-μm-wide device with a 1.3-μm active channel length, the highest power achieved was approximately −10 dBm at 164 GHz.
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    Micro-cooler enhancements by barrier interface analysis
    (AIP Publishing LLC, 2014) Stephen, A.; Dunn, G. M.; Glover, James; Oxley, C. H.; Bajo, M. M.; Cumming, D. R. S.; Khalid, A.; Kuball, M.
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    Terahertz oscillations in an In0.53Ga0.47As submicron planar Gunn diode
    (AIP Publishing LLC, 2014) 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, James; Cumming, D. R. S.