Development and Application of Time-Resolved Cathodoluminescence for Nanoscale Characterization H/F

CEA · Grenoble (38) · Stage

Publiée le 20 octobre 2026

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.

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.

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.

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.

Compétences

Voir l'offre d'origine et postuler · Source : site carrières de CEA

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