Publication

Measurements of the Diffusion Length in GaAs/AlGaAs Quantum-Well (Qw) Structures by Cathodoluminescence - Comparison of the Bulk and Qw Diffusion Channels

Jean-Daniel Ganière
1993
Book Chapters

Abstract

In a recent paper, we measured the hole diffusion length in a single quantum well (SQW) by a novel method using SEM-cathodoluminescence, assuming that the carriers diffuse only in the SQW. This assumption needs to be checked. Therefore, we present here a model for the carrier transport in the SQW and in the bulk barrier to deduce the lateral hole distribution in both layers. The main lateral transport is shown to be carried by the holes in the QW (2D diffusion) due to their confinement in the well.

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https://infoscience.epfl.ch/entities/publication/caefa5c4-b29c-4ba6-b1d3-a2164712e02d

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Jean-Daniel Ganière
1993
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/caefa5c4-b29c-4ba6-b1d3-a2164712e02d

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.

Diffusion

Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential. It is possible to diffuse "uphill" from a region of lower concentration to a region of higher concentration, like in spinodal decomposition. Diffusion is a stochastic process due to the inherent randomness of the diffusing entity and can be used to model many real-life stochastic scenarios.

Facilitated diffusion

Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. Being passive, facilitated transport does not directly require chemical energy from ATP hydrolysis in the transport step itself; rather, molecules and ions move down their concentration gradient reflecting its diffusive nature.

Related publications (6)

Measurements of the Diffusion Length in GaAs/AlGaAs Quantum-Well (Qw) Structures by Cathodoluminescence - Comparison of the Bulk and Qw Diffusion Channels

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