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

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:
• Development and optimization of TRCL measurement protocols for microLED characterization including the control of electron beam energy, beam current and sample temperature,
• Investigation of carrier dynamics in microLED structures with particular attention to the influence of device dimensions, sidewalls, interfaces and material defects,
• 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