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Proceedings Paper

Nonlinear conduction and space charge wave generation in semiconductor superlattices
Author(s): Christophe Minot; H. Le Person; Jean Francois Palmier; Jean Christophe Harmand
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Paper Abstract

Negative differential velocity is evidenced in semiconductor superlattices through several experimental approaches: temperature dependence of the current-voltage characteristics, frequency spectrum of the microwave S-parameters, and time-resolved photocurrent induced by a short optical pulse. In particular, new experimental data for GaInAs/AlInAs superlattices matched to InP are analyzed owing to classical models. They yield the miniband width dependence of the mobility, critical field and peak velocity which describe the electron velocity laws. The latter are in fair agreement with a semiclassical model based on numerical solutions of the Boltzmann equation, i.e., a rigorous extension of the simpler Esaki-Tsu model of miniband conduction. In the dynamical experiments, the temporal evolution of the electron distribution in the superlattice structure is represented in terms of propagating space charge waves, which can give rise to amplification and oscillation. Consequences of miniband conduction regarding maximum frequency and noise of superlattice-based oscillators are also examined.

Paper Details

Date Published: 6 May 1994
PDF: 12 pages
Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); doi: 10.1117/12.175903
Show Author Affiliations
Christophe Minot, France Telecom (France)
H. Le Person, France Telecom (France)
Jean Francois Palmier, France Telecom (France)
Jean Christophe Harmand, France Telecom (France)

Published in SPIE Proceedings Vol. 2142:
Ultrafast Phenomena in Semiconductors
David K. Ferry; Henry M. van Driel, Editor(s)

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