Light-emitting diodes (LEDs) based on (In,Ga)N/GaN quantum wells have revolutionized lighting but their efficiencies drop drastically for emission in the amber and red spectral range. We offer a PhD project aimed at paving the way towards higher efficiencies by pursuing a novel approach for the fabrication of pseudo-substrates for such LEDs. The key idea is to reduce the lattice mismatch for the quantum wells by epitaxial layer growth on top of GaN nanowires that accommodate strain. This project builds up on procedures established at PDI and will be embedded in the core-research area ‘III-V nanowires for optoelectronics’. The novel technology could enable micro-LED displays required for augmented reality applications.
Growth of (In,Ga)N coalescence layers and quantum wells by molecular beam epitaxy
Top-down fabrication of GaN nanowire ensembles needed for overgrowth with the assistance of the clean room staff
Sample characterization by x-ray diffractometry, atomic force microscopy, and photo- as well as cathodoluminescence spectroscopy
Data analysis and planning of experiments
Presentation of results at conferences and in publications
Master degree in physics, materials science, or a related field
Preferentially background in semiconductor physics or nanotechnology
Experience with molecular beam epitaxy and/or investigations of group-III nitrides is advantageous.
This position is available immediately and is limited to a 3-year period initially with the perspective of a 1-year extension. Salary and benefits are according to the Treaty for German public service (TVöD Bund) to a level of E13-66%.
What we offer:
Modern laboratories with a wide range of experimental techniques
Supportive environment with experts for various scientific subfields and a low number of students per advisor
International and culturally diverse community
Location in the heart of Berlin with excellent public transport connections and a subsidized travel ticket
Possibility to participate in professional development programs
The Paul Drude Institute is part of the Forschungsverbund Berlin e.V. and a member of the Leibniz Association. The institute carries out basic and applied research at the nexus of materials science, condensed matter physics, and device engineering.
Inclusive & equal opportunity employer
With approximately 100 employees and more than 15 nationalities, PDI is committed to building a talented, inclusive, and culturally diverse workforce. We understand that our shared future is guided by basic principles of fairness and mutual respect. Among equally qualified applicants, preference will be given to candidates from marginalized groups. As an equal opportunity and family-friendly employer, we offer highly flexible employment conditions, such as flexible working hours, parental leave, and home office, and we strive to create a family- and life-conscious working environment.
How to apply
Please send your application as a single PDF file to Even Pruefer (he/him/his) at recruiting(at)pdi-berlin.de by August 11, 2023 with the title of the position in the subject line. The document should include a dedicated cover letter, CV, publication list, letter(s) of recommendation/contact information of references, diploma(s), and transcript(s).For scientific information about the project, please contact Dr. Lutz Geelhaar at geelhaar(at)pdi-berlin.de
Paul-Drude-Institut (PDI) im Forschungsverbund Berlin e.V