The Leibniz-Institut für Kristallzüchtung (IKZ) is a leading research institution in the field of science & technology as well as service & transfer of crystalline materials. Our goal is to enable solutions for pressing societal challenges (e.g. communication, artificial intelligence, climate protection, health, etc.) through modern electronic & photonic technologies. The work covers the entire spectrum from basic and applied research to pre-industrial development and is carried out in cooperation with national and international partners from universities, academies and industry. The institute is part of the Forschungsverbund Berlin (https://www.fv-berlin.de/) and a member of the Leibniz Association (https://www.leibniz-gemeinschaft.de). You can find more details on the institute webpage: https://www.ikz-berlin.de.

The Leibniz-Institut für Kristallzüchtung currently offers a

PhD student (f/m/d)

for the topic

“Investigation of defects and dislocation dynamics in Ga₂O₃ crystals
by 3D X‑ray diffraction imaging and microscopic modeling.”

With its high breakdown field, wide bandgap, and excellent Baliga figure of merit, β-Ga₂O₃ is well-suited for next-generation power electronics and optoelectronic applications. However, crystal defects such as dislocations, stacking faults, twins, and voids can significantly degrade device performance, increasing leakage currents and reducing breakdown strength. Understanding the formation, evolution, and impact of these defects – particularly under thermal and mechanical stress during growth and handling – is essential for producing high-quality substrates and therefore crucial for advancing β-Ga₂O₃ toward commercial device applications.

This project aims at the microscopic characterization of defect structures in β-Ga₂O₃ single crystals and their evolution under thermomechanical stress. Recent developments in X‑ray diffraction imaging present a unique opportunity for non-destructive, high-resolution mapping of internal crystal defects in 3D. It enables the direct observation of dislocation networks, strain fields, and defect evolution under various conditions, offering critical insights into the formation mechanisms and behavior of defects during growth and cooling.

The investigations will be carried out at both in IKZ labs and synchrotron radiation sources such as the KIT (Karlsruhe), ESRF (Grenoble), and DESY (Hamburg). The work will include complementary characterization by laser scattering tomography and theoretical modeling of dislocation dynamics based on known stress fields. The project will be carried out in close collaboration with the Institute for Photon Science and Synchrotron Radiation (IPS) at KIT, Karlsruhe. Regular scientific exchange, joint meetings and joint experiments at synchrotron sources are pivotal for its success.

Requirements:

MSc degree in physics, materials science, or in a related discipline
Profound data processing and image analysis skills
Good knowledge in programming, ideally in Python
Ability to work self-reliant and to collaborate in a team of scientists, technicians and students
A strong command of English. A basic knowledge of German is beneficial.

Prior experience in the following fields is an asset to your application:

Single-crystal X-ray diffraction for bulk or thin-films characterization
Usage of synchrotron radiation
Design or operation of high-temperature sample environments
Crystallography or crystal growth

What we offer

The position is limited to three years, an extension for another year is possible. Payment is according to TVöD Bund (E13 75%) (Collective agreement for the public sector). The contract includes the usual social benefits (30 vacation days in a 5-day week, flexible working hours). The Leibniz-Institut für Kristallzüchtung actively promotes the development of young scientists and follows the guidelines of the Leibniz Association.

The Leibniz-Institut für Kristallzüchtung actively supports a healthy work-life balance and is an equal opportunities employer. Female candidates are encouraged to apply and will be given preference if suitably qualified. Among equally qualified candidates, preference will be given to candidates with disabilities. IKZ promotes diversity. We welcome every qualified application, regardless of age, belief, disabilities, ethnic origin, gender, nationality, religion, or sexual orientation.

For information about the project please contact:

Dr. Carsten Richter, Tel. +49 30 246 499 516, carsten.richter@ikz-berlin.de

https://www.ikz-berlin.de/en/research/materials-science/section-experimental-characterization

Have we aroused your interest?

Then apply with a letter of motivation, curriculum vitae and all relevant certificates. To do so, please go to Job offers/jobs on our homepage and click on this advertisement and then on "Apply online". Applications will be accepted until the position is filled.

We look forward to receiving your application!

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