Submillimeter-Wave Oscillations in Recessed InGaAs/InAlAs Heterostructures: Origin and Tunability

• Authors: S. Pérez , J. Mateos , T. González
• Languages of publication: EN

Abstracts

EN

By means of an ensemble Monte Carlo simulator, the appeareance of THz oscillations in InAlAs/InGaAs slot diodes is predicted when the applied bias exceeds the threshold for intervalley transfer. Such high frequency is attained by the presence of a Gunn-like effect in the recess-to-drain region of the device channel whose dynamics is controlled by ballistic Γp valley electrons. In this work we explain the mechanism at the origin of this effect and also the influence of the bias conditions, δ-doping, recess-to-drain distance and recess length on the frequency of the ultrafast Gunn-like oscillations. The simulations show that a minimum value for the δ-doping is necessary to have enough carrier concentration under the recess and allow the oscillations to emerge. Finally, we show that shortening the devices (small recess and recess-to-drain lengths) increases the oscillation frequency, so provides an interesting frequency tunability of this THz source.

Keywords

EN

85.30.Fg; 07.57.Hm; 73.40.Kp

Discipline

• 07.57.Hm: Infrared, submillimeter wave, microwave, and radiowave sources(see also 42.72.Ai Infrared sources in optics)
• 85.30.Fg: Bulk semiconductor and conductivity oscillation devices (including Hall effect devices, space-charge-limited devices, and Gunn effect devices)
• 73.40.Kp: III-V semiconductor-to-semiconductor contacts,p-njunctions, and heterojunctions

• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 119
• Issue: 2
• Pages: 111-113

Dates

published

2011-02

Contributors

author

S. Pérez

• Dpto. Física Aplicada, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain

author

J. Mateos

• Dpto. Física Aplicada, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain

author

T. González

• Dpto. Física Aplicada, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain

References

• 1. J. Mateos, T. González, D. Pardo, V. Hoël, A. Cappy, IEEE Trans. Electron Dev. 47, 1950 (2000)
• 2. N. Dyakonova, A. El Fatimy, J. Łusakowski, W. Knap, M.I. Dyakonov, M.A. Poisson, E. Morvan, S. Bollaert, A. Shchepetov, Y. Roelens, Ch. Gaquiere, D. Theron, A. Cappy, Appl. Phys. Lett. 88, 141906 (2006)
• 3. S. Pérez, T. González, D. Pardo, J. Mateos, J. Appl. Phys. 103, 094516 (2008)
• 4. J. Mateos, T. González, D. Pardo, V. Hoel, A. Cappy, IEEE Trans. Electron. Dev. 47, 1950 (2000)

Identifiers

DOI

10.12693/APhysPolA.119.111