General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
2026-42190
Description de l'unité
In Grenoble, capital of the french Alps, LETI is an institute dedicated to applied research in micro and nano technologies, information technologies and technologies for healthcare .LETI is the privileged interface between industry and academia. Through research programs using worl leading technology patforms it ensures the development and industrial transfer of innovative technologies in a wide range of sectors.
Position description
Category
Materials, solid state physics
Contract
Internship
Job title
Development and Application of Time-Resolved Cathodoluminescence for Nanoscale Characterization H/F
Subject
The candidate will work on the development and application of advanced TRCL measurements on microLED structures.
The internship will be carried out within the PFNC platform at CEA Leti which provides access to advanced nanoscale characterization facilities. The candidate will work in close interaction with researchers and engineers involved in III nitride and microLED technologies.
Contract duration (months)
6
Job description
Framework and context: MicroLEDs based on III nitride semiconductors are promising candidates for next generation display and optoelectronic technologies. Their performance is strongly influenced by carrier recombination and transport processes occurring at the nanoscale, particularly in the vicinity of sidewalls, interfaces and material defects. Time Resolved Cathodoluminescence (TRCL) is a powerful technique combining the high spatial resolution of electron microscopy with time and spectrally resolved luminescence measurements. It enables the investigation of local carrier dynamics and luminescence properties with nanometric spatial and sub nanosecond temporal resolution. The objective of this internship is to develop and apply TRCL characterization methodologies to III nitride microLEDs with a particular focus on understanding spatial variations in luminescence and carrier dynamics.
Work description:
The work will include:
1. Development and optimization of TRCL measurement protocols for microLED characterization including the control of electron beam energy, beam current and sample temperature,
2. Investigation of carrier dynamics in microLED structures with particular attention to the influence of device dimensions, sidewalls, interfaces and material defects,
3. Data processing and analysis of multidimensional TRCL datasets, combining spatial, spectral and temporal information, and correlation with complementary characterization techniques such as Time Resolved Photoluminescence and Kelvin Probe Force Microscopy.
Methods / Means
Time Resolved Cathodoluminescence (TRCL)
Applicant Profile
The applicant must be strongly motivated to learn how to handle advanced facilities and analyze the data. He will have the opportunity to develop transverse skills as the work will be carried out with academic collaborators, and will involve issues of intellectual property, industrial experience with the LETI partners and a daily practise of English. Proper background in solid state physics is essential. Basic knowledge about luminescence techniques is not mandatory but will be appreciated.
Possible continuation as a PhD thesis. Depending on the results of the internship and the candidate's performance, the internship may lead to a PhD thesis starting after the internship.
Position location
Site
Grenoble
Job location
France, Auvergne-Rhône-Alpes, Isère (38)
Location
Grenoble
Candidate criteria
Languages
English (Fluent)
Prepared diploma
Bac+4/5 - Diplôme de recherche technologique (DRT/DRI)
Recommended training
M2 Master of Science
PhD opportunity
Oui
Requester
Position start date
01/03/2027