Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)

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Electroluminescence of individual carbon nanotubes

par Christelle EVE - publié le

Context :
Optical phenomena in individual carbon nanotube arises from strongly binded electron-hole pair forming a quasi particle named exciton. Although the process of optical transition are well understood in general, there are still unaddressed fundamental questions about the life and fate of excitons. In particular, the influence of temperature on the behavior of excitons is of very high interest in a context of super-narrow optical sources [1], electroluminescent devices [2], and more generally high-performance integrated optical devices [3,4].

The temperature is a crucial parameter, as it controls the amount of phonons populating the vibration modes of the nanotube. Another key aspect if the environment of the nanotube, that could lead to exciton localization [5].

[1] J. A. Alexander-Webber et al., Nano Letters 14 (2014)
[2] F. Pyatkov et al., Nature Photonics 10 (2016)
[3] E. Gaufrès et al., ACS Nano 6 (2011)
[4] A. Noury et al., Nanotechnology 25 (2014)
[5] V. Ardizzone et al., Physical Review B 91 (2015)

Scientific and technical work :
This internship aims at exploring the physics of the excitons in carbon nanotubes. The internship will tackle experimental aspects linked to the radiative recombination of optically and/or temperature dependence.
In this internship, the intern will :
- realize samples using individual nanotubes, using several configuration (with or without electrodes, suspended or on a substrate, pre-sorted or as-grown...)
- carry experiments to study the electro-optical properties of these nanotubes : Photoluminescence, Electroluminescence, Raman Scattering. In particular, the influence of three main parameters will be studied (excitation method, environment, temperature) in this project.

Profile
This project is adapted for a student with a background in physics, applied physics or nanosciences. Prior knowledge of carbon nanotube science is not necessary. The internship involve substantial experimental work for sample preparation and use of free space optical setup, so the taste for experimental work is mandatory. Strong taste for interdisciplinary research and learning new stuff is also essential. This internship will ideally be extended into a cutting-edge PhD project, to develop an interdisciplinary profile that is widely sought for in today’s research.

Additional information :
Length of the internship : 4 to 6 months
Starting date : flexible, to be defined with the candidate

Advisor : Nicolas Izard, Adrien Noury


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