Publication

Density Dependence of Electron-Hole Plasma Lifetime in Semiconductor Quantum-Wells

Jean-Louis Staehli
1992
Journal Articles

Abstract

We report on an investigation of the electron-hole (e-h) plasma decay time tau(tot) versus e-h pair density in semiconductor quantum wells. We determine the density reached in a steady-state photoluminescence experiment from the optical spectra and compare it with the e-h pair generation rate. We find that in our samples only radiative e-h recombination is important, and that nonradiative processes and plasma expansion have negligible effects on tau(tot). At plasma densities larger than 5 x 10(12) cm-2, we observe a strong nonlinear reduction of the e-h capture rate into the quantum wells.

Official source

https://infoscience.epfl.ch/entities/publication/c69a57c5-03f2-4d17-862a-34193a1d857f

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Jean-Louis Staehli
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c69a57c5-03f2-4d17-862a-34193a1d857f

About this result

Related concepts (32)

Quantum well

A quantum well is a potential well with only discrete energy values. The classic model used to demonstrate a quantum well is to confine particles, which were initially free to move in three dimensions, to two dimensions, by forcing them to occupy a planar region. The effects of quantum confinement take place when the quantum well thickness becomes comparable to the de Broglie wavelength of the carriers (generally electrons and holes), leading to energy levels called "energy subbands", i.e.

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

Electron

The electron (_Electron or _beta-) is a subatomic particle with a negative one elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron's mass is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.

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Density Dependence of Electron-Hole Plasma Lifetime in Semiconductor Quantum-Wells

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