Research & development - Leuven | More than two weeks ago
Metal halide perovskite semiconductors have recently emerged as an exciting material system for optoelectronics devices such as solar cells, light-emitting diodes, and photodetectors. Perovskite light-emitting diodes (PeLEDs) have witnessed a remarkable success in the recent years, achieving external quantum efficiencies of more than 20% and half-lifetimes > 100 h, bringing them closer to more mature thin-film devices based on organic semiconductors and core-shell quantum dots. The rapid progress in these devices is due to their unique properties such as high carrier mobility, high photoluminescence quantum yield, and facile processing techniques, etc. In the ULTRA-LUX project, we aim to demonstrate a perovskite-based injection laser, a breakthrough that will lead to many applications such as on-chip light sources integrated into common CMOS photonic platforms, Lab-on-a-Chip devices, and advanced spectroscopy.
An interesting aspect of metal halide perovskites is their mixed ionic-electronic conduction. Due to the low ion activation energy, especially the halide species, ions migrate under the influence of electric field, which leads to different anomalous observations in their current-voltage (IV) characteristics. Ion migration has also been shown to play an important role in the device stability. Despite extensive research, ion migration remains far from being fully understood in the scientific community. To this end, understanding the role of ions in our PeLEDs is of primary importance to the project. The student will study different PeLED structures using techniques like impedance spectroscopy and transient ion drift. The student will extract important parameters such as ion activation energy and diffusion constant. Moreover, the dependence of these parameters on different structures and device stacks will be investigated.
The objectives and the approach can be tailored to the student’s interest and expertise. The student will benefit from the support of a multi-disciplinary collaborative team of PhD students, Postdocs, senior researchers, and Professors. The project is expected to help the student acquire different skills which are useful for further academic work or for the job market. If the results are beyond state of the art, this work has the potential to contribute to a high-quality scientific publication.
The student is expected to be a self-driven and motivated individual, willing to tackle different tasks and learn new skills to achieve his objectives. The student should also be a team-player and willing to communicate in meetings and report on the progress. Knowledge of semiconductor devices and physics is highly recommended.
Type of project: Internship, Thesis
Duration: 6-9 months
Required degree: Master of Science, Master of Engineering Technology, Master of Engineering Science
Required background: Nanoscience & Nanotechnology, Physics, Electrotechnics/Electrical Engineering
Supervising scientist(s): For further information or for application, please contact: Karim Elkhouly (Karim.Elkhouly@imec.be)
Imec allowance will be provided for students studying at a non-Belgian university.