The Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) is an application-oriented research institute in the fields of high-frequency electronics, photonics and quantum physics. It researches electronic and optical components, modules and systems based on compound semiconductors. These devices are key enablers that address the needs of today’s society in fields like communications, energy, health, and mobility. It covers the entire value chain from design to ready-for-delivery systems.
We look for a research staff member / PhD-Student for our Joint-Lab Photonic Quantum Technologies, which is part of the Integrated Quantum research division.
(Reference number 17/23)
Your activities
The proposed PhD project will focus on the selective creation and modification of defects in two-dimensional (2D) materials, especially in graphene on silicon carbide. The defects will serve as nucleation centers for epitaxial growth of hexagonal boron nitride (hBN) constituting a platform for the scalable fabrication of 2D van-der-Waals heterostructures. Such heterostructures are expected to lead to atomically thin electronic sensors or devices.
The defects are introduced by localized material removal upon focused He ion beam impact. This technique is mask-free, therefore reducing contamination, and relies on the direct control of a focused ion beam in a He ion microscope. Together with our collaboration partners the fabricated van-der-Waals heterostructures will be characterized using atomic force and Kelvin probe force microscopy concerning the structural and electronic properties. The possibility of in-situ or ex-situ termination of the defects will be explored. Placement and chemical termination of the defects shall be optimized such that first device prototypes (here: quantum Hall devices) can be fabricated. The epitaxial growth, the device fabrication and the modeling of defect creation and termination are carried out in a complementary part of the project.
The PhD project is funded by the Leibniz Association within the framework Collaborative Excellence relying on close collaboration with our partners of the Paul Drude institute (epitaxy, device fabrication) and of the Helmholtz-Zentrum Dresden-Rossendorf (modeling).
Your profile
Applicants are expected to hold a very good (top 20%) degree (Master or Diploma) in Physics with in-depth knowledge in electrodynamics and solid-state physics. We are looking for a highly motivated student with strong problem solving skills, the ability to work independently and good organizational skills. Knowledge in scanning electron microscopy or in focused ion beam patterning are a plus. Good command of English language is mandatory.
Our offer
We offer a challenging and interdisciplinary activity. Employment, remuneration and social benefits are based on the collective agreement for the public sector (TVöD Bund). The position can be filled immediately and is initially limited to 2 years.
FBH is an equal-opportunity employer and actively supports the compatibility of family and career. Particular attention is paid to gender equality. The Institute strives to increase the proportion of women in this area. Female candidates are encouraged to apply. Among equally qualified applicants, preference will be given to handicapped candidates.
Have we piqued your interest? Then we look forward to your online application. Please click on "Apply online" and submit your complete application documents not later than 31.05.2023.
If you have any questions about the application, please contact Mrs. Katja Höflich
Tel.: +49 30 6392 2938, email katja.hoeflich@fbh-berlin.de
