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The electric field-induced modifications of the spatial distribution of photoelectrons, photoholes, and electronic spins in optically pumped p + GaAs are investigated using a polarized luminescence imaging microscopy. At low pump intensity, application of an electric field reveals the tail of charge and spin density of drifting electrons. These tails disappear when the pump intensity is increased since a slight differential drift of photoelectrons and photoholes causes the buildup of a strong internal electric field. Spatial separation of photoholes and photoelectrons is very weak so that photoholes drift in the same direction as photoelectrons, thus exhibiting a negative effective mobility. In contrast, for a zero electric field, no significant ambipolar diffusive effects are found in the same sample.
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9 August 2017

fundamentally new modeling of the distribution and transport of charge carriers in disordered semiconductors

Light-emitting diodes are nowadays increasingly used, and, if widely implemented in general lighting with an energy conversion efficiency of 80%, would save 10% of the electricity consumed (...)

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12 July 2017

Kwanjeong Educational Foundation-KEF award

A Korean student, Jeongmo KIM, undertook his Master2 internship in the Solid Chemicals group of PMC, on the theme of nanorods (from the nano object to the device). He was awarded a prestigious (...)

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1 July 2017

Luminescent nanorods as ultimate probes of fluid flow

A new method, based on the measurement of the polarized luminescence of nanorods, has been developed for the study of the flow in microchannels. This work, carried out in the framework of a (...)

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26 June 2017

Physics renews lung function tests

Physics renews lung function tests
Lung diseases are a major cause of disability and death. Progress in treatment depends critically on how doctors interpret the clinical tests that patients (...)

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17 May 2017

Modeling of grain coarsening in polycristals

Most solids are polycrystalline: they consist of multiple crystalline grains separated by grain boundaries. All the grains are equivalent up to a rotation, and the properties of the grain (...)

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