Publication

Optical studies of charged excitons in II-VI semiconductor quantum wells

Benoît Marie Joseph Deveaud, Victoria Ciulin
2003
Book Chapters

Abstract

A brief review is given of optical experiments related to the creation and recombination of charged excitons. The fundamental parameters of these states are discussed. This includes their energies, optical transition probabilities, and characteristic times of their formation, thermalisation, and decay. A model of free three-particle charged exciton is shown to describe correctly the results of many experiments. The applicability range of the model is limited by many body effects at higher carrier concentrations and by localisation, typically due to disorder.

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https://infoscience.epfl.ch/entities/publication/8b3dc3ef-b92a-48a4-bc3f-9d071c2cba8b

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Benoît Marie Joseph Deveaud, Victoria Ciulin
2003
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8b3dc3ef-b92a-48a4-bc3f-9d071c2cba8b

About this result

Related concepts (19)

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.

Exciton

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge. An exciton can form when a material absorbs a photon of higher energy than its bandgap. This excites an electron from the valence band into the conduction band.

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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Optical studies of charged excitons in II-VI semiconductor quantum wells

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