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.

Given the approval of funding the Leibniz-Institut für Kristallzüchtung is currently looking for a

PhD student (f/m/d)

for the topic:

“Investigation of defect evolution causing optical degradation in industry-grade UV C LEDs.”

The underlying material system is the (Al,Ga)N alloy, which currently represents the most promising semiconductor platform for optoelectronics operating in the UV-C spectral range. Despite significant technological progress, UV-C LED emitters still exhibit limited efficiency and reliability. The aim of the project is hence to identify the underlying mechanisms responsible for optical degradation in such devices. In particular, the project focuses on the evolution of defects under electrical and thermal stress, which limits both the electrical-to-optical conversion efficiency, as well the operational lifetime of these devices. The project involves optical and electrical in operando characterization techniques using custom-designed setups, mainly involving

Acquisition of detailed electrical data and optical emission information.
Cathodoluminescence measurements.

Since degradation experiments typically extend over one week or longer, all measurements are performed in a fully automated manner. This includes the development of Python-based control and automation routines, as well as the analysis of large experimental datasets.

These characterization techniques may be complemented by X-ray-based in operando investigations that reveal structural information related to stress. Experimental work will be carried out predominantly in the IKZ laboratories. For advanced X-ray investigations, beamtime applications are planned at major synchrotron radiation facilities, including KIT (Karlsruhe), ESRF (Grenoble), and DESY (Hamburg). Regular scientific exchange, joint meetings, and collaborative experiments are integral parts of the project and essential for its successful completion.

Requirements:

MSc degree in physics, materials science, or a related discipline
Knowledge of semiconductor physics, particularly optoelectronics
Hands-on experience in optical spectroscopy
Good programming skills, ideally in Python
Ability to collaborate and coordinate work within a team of scientists, technicians, and students
Strong command of English; basic knowledge of German is beneficial

Prior experience in the following areas is considered an asset:

Design and/or operation of optical setups
Scanning electron microscopy / cathodoluminescence spectroscopy

What we offer
The position is limited to three years. 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.

If you want to have more information about the project, please contact us:
Dr. Tobias Schulz (tobias.schulz@ikz-berlin.de), Phone: +49 30 246 499 350

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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