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State University (France), Browse similar opportunities
SL-DRT-21-0515
Solid state physics, surfaces and interfaces
GaN-based µLEDs seem promising for augmented reality (AR) or virtual reality (VR) applications. Indeed, they would make it possible to produce screens with resolutions and luminances that had not yet been achieved. But these µLEDs suffer from a lower efficiency compared to their larger sibling. A commonly accepted explanation for this efficiency degradation lies in the existence of numerous surface defects induced by pixel singularization etching. The smaller the dimensions of the LED, the more important the surface defects play in the electro-optical behavior. Their presence, if they are shallow, can facilitate electrical injection, on the other hand if they are deep, they contribute to the degradation of the electro-optic performances of devices such as LED.This thesis aims to quantify and qualify the surface defects in GaN, InGaN and AlGaN that make up GaN-based µLEDs. The doctoral student will have to carry out by himself all the stages of realization of new components necessary for this study, starting with the design of the photolithography masks, the realization of all the technological steps and finally the electro-optical characterizations such as DLTS (Deep Level Transient Spectroscopy), DLOS (Deep Level Optical Spectroscopy) or photocurrent. At the end, the doctoral student will have to identify the surface defects that are the most limiting for the efficiency of LEDs and the most favorable to the injection of electrical carriers.The thesis will be carried out in close collaboration with Ph Ferrandis (thesis director) from Néel Institute (CNRS), N. Rochat (co-supervisor) from CEA Leti (PFNC Nano Characterization Platform) and David Vaufrey (supervisor) from CEA Leti (LCEM Emissive Device Laboratory).The thesis grant would be fully funded by the CEA Leti in Grenoble for a period of 3 years.
Département d’Optronique (LETI)
Laboratoire des Composants Emissifs
Grenoble
VAUFREY David
CEA
DRT/DOPT//LCEM
17, rue des martyrs38054 Grenoble CedexBat. 52 - P. A204
Phone number: +33 (0)4 38 78 04 91
Email: David.Vaufrey@cea.fr
Université Grenoble Alpes
Ecole Doctorale de Physique de Grenoble
https://www.leti-cea.fr/cea-tech/leti
Start date on 01-09-2021
FERRANDIS Philippe
Université de Toulon
Institut Néel (CNRS UPR2940)
Institut NEEL CNRS/UGA UPR294025 rue des Martyrs BP 16638042 Grenoble cedex 9Bureau D417
Phone number: 04 76 88 74 64
Email: philippe.ferrandis@neel.cnrs.fr
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