Master Thesis

The Ernst Ruska-Centre (ER-C) for microscopy and spectroscopy with electrons is a center of excellence in advanced transmission electron microscopy (TEM) and spectroscopy for addressing topical problems in materials science, solid-state physics and chemistry, biology and soft matter. It comprises three divisions which each have a different focus. At ER-C-1 (Physics of Nanoscale Systems) we carry out systematic characterizations using various complementary techniques, including the latest TEM based techniques, such as electron holography, HR-(S)TEM, high energy resolution spectroscopy, 4D-STEM, and ptychography. This enables the measurement of, e.g., electrical potentials and magnetic fields, polarization fields, built-in potentials, strain, and carrier dynamics on nanometer scales with high temporal resolution.

**Your Job**:
In this Master's thesis, ternary nitride compound semiconductor samples are to be characterized both electrically and structurally using off-axis electron holography, scanning transmission electron microscopy, convergent electron beam diffraction, and geometrical phase analysis. These experiments will be conducted to understand the carrier dynamics in these mateials system with and without laser beam illumination using directed electron detectors.

Your tasks in detail:

- Preparation of electron transparent TEM specimens
- Determination of lamella thicknesses by convergent electron beam diffraction and electron energy loss spectroscopy
- Mapping of electrostatic potentials and excited carrier concentrations using off-axis electron holography under laser illumination

**Your Profile**:

- You are interested in and ideally also have previous knowledge in the fields of electron microscopy, solid state physics, and laser optics.
- You can work independently and reponsibly, show commitment, a high level of teamwork, and enjoyment of cooperative collaboration.
- Furthermore, you can quickly familiarize yourself with new methods and techniques.
- You are fluent in written and spoken English.

**Our Offer**:
We work on highly relevant, innovative topics and offer you the opportunity to actively shape change

We offer you:

- An interesting and socially relevant topic for your thesis with a future-oriented topic
- Ideal conditions for practical experience alongside your studies
- Interdisciplinary collaboration on projects in an international, committed and collegial team
- Excellent scientific equipment and the latest technology
- Qualified supervision by scientific colleagues
- Independent preparation and implementation of the assigned tasks
- A large research campus in the countryside, which offers the best opportunities for networking with colleagues and for sporting activities alongside work
- Flexible working hours and appropriate remuneration
The opportunity to work flexibly (in terms of location), e.g. partly from home