Publication

Hot phonons and Auger related carrier heating in semiconductor optical amplifiers

Benoît Marie Joseph Deveaud, Marc-André Dupertuis, Daniel Marti, Lars Kappei
2002
Journal Articles

Abstract

We have directly measured the carrier temperature in semiconductor optical amplifiers (SOAs) via spontaneous emission and we demonstrate an unexpectedly high carrier temperature. The direct correlation of the temperature increase with the carrier density suggests Auger recombination as the main heating mechanism. We have developed a model based on rate equations for the total energy density of electrons, holes, and longitudinal-optical phonons. This model allows us to explain the thermal behavior of carrier and phonon populations. The strong heating observed is shown to be due to the combined effects of hot phonon and Auger recombination in the valence band. We also observe an evolution of the Auger process, as the density is increased, from cubic to square dependence with coefficients C-3 = 0.9 10(-28) cm(6) s(-1) and C-2 = 2.4 10(-10) cm(3) s(-1). This change is explained by the hole quasi-Fermi level entering the valence band.

Official source

https://infoscience.epfl.ch/entities/publication/2a489c8f-8eda-4792-8f26-c3ab42df0b1d

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Benoît Marie Joseph Deveaud, Marc-André Dupertuis, Daniel Marti, Lars Kappei
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2a489c8f-8eda-4792-8f26-c3ab42df0b1d

About this result

Related concepts (32)

Photoluminescence

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Charge carrier

In physics, a charge carrier is a particle or quasiparticle that is free to move, carrying an electric charge, especially the particles that carry electric charges in electrical conductors. Examples are electrons, ions and holes. The term is used most commonly in solid state physics. In a conducting medium, an electric field can exert force on these free particles, causing a net motion of the particles through the medium; this is what constitutes an electric current.

Valence and conduction bands

In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states. On a graph of the electronic band structure of a semiconducting material, the valence band is located below the Fermi level, while the conduction band is located above it.

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Hot phonons and Auger related carrier heating in semiconductor optical amplifiers

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