Publication

Effect of disorder on the temperature dependence of radiative lifetimes in V-groove quantum wires

Elyahou Kapon, Marc-André Dupertuis, Daniel Oberli
1999
Journal Articles

Abstract

We have studied the effect of disorder on the radiative properties of semiconductor quantum wires by time-resolved photoluminescence spectroscopy. The dependence of the radiative lifetimes is measured over a temperature range extending from 8 to 150 K. At low temperatures we find that the measured dependence does not conform to the theoretical prediction for recombination of free excitons in a quasi-one-dimensional system due to the major influence of disorder. An extension of the theory is developed in order to take into account exciton ionization and the contribution of free carriers. A mean localization length for excitons is also estimated from the radiative lifetime at 8 K. [S0163-1829(99)12903-5].

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https://infoscience.epfl.ch/entities/publication/e18a8f46-3ca7-4fe1-8b7e-74888e9d25ac

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Elyahou Kapon, Marc-André Dupertuis, Daniel Oberli
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e18a8f46-3ca7-4fe1-8b7e-74888e9d25ac

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.

Carrier generation and recombination

In the solid-state physics of semiconductors, carrier generation and carrier recombination are processes by which mobile charge carriers (electrons and electron holes) are created and eliminated. Carrier generation and recombination processes are fundamental to the operation of many optoelectronic semiconductor devices, such as photodiodes, light-emitting diodes and laser diodes. They are also critical to a full analysis of p-n junction devices such as bipolar junction transistors and p-n junction diodes.

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Effect of disorder on the temperature dependence of radiative lifetimes in V-groove quantum wires

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