About the position
PDI has recently opened a new application laboratory for time-resolved cathodoluminescence (TRCL) spectroscopy, which combines high spatial, spectral, and temporal resolution to investigate the dynamics of charge carriers in semiconductors, with a particular focus on optimized deep ultraviolet (UV) detection. This unique experimental facility is part of the analytical scanning electron microscopy (SEM) group in the semiconductor spectroscopy department. First investigations have provided new insights into the spectral features of the ultrawide bandgap semiconductor AlN, as well as into the role of point defects in polar c-plane quantum wells for deep UV light-emitting devices (LEDs). The current project would expand these spectroscopic investigations to the nonpolar m-plane growth direction of AlN and (Al, Ga)N heterostructures. On the one hand, measurements in this geometry would allow us to investigate the importance of light extraction efficiency linked to the valence band symmetries in high Al content alloys. On the other hand, the polar wurtzite crystal structure induces strong polarization fields across heterostructures that strongly influence device characteristics, but are absent for nonpolar growth. Dedicated samples for this study will be grown at PDI by molecular beam epitaxy.
Your responsibilities
- (TR)CL spectroscopy of nonpolar AlN layers and (Al, Ga)N heterostructures
- Complementary photoluminescence measurements
- k.p calculations of band profiles and transition energies for the investigated heterostructures
- Publication of results in relevant journals and presentation at scientific conferences
- Contribute measurements to collaborations with internal and external partners
- Communication with collaborating research groups
- Support PhD and master's students in their lab work and data analysis tasks
Your profile
- PhD in experimental solid state physics.
- Scientific track record with first-author publications and conference presentations.
- Experience with widegap semiconductor materials characterization, preferably using luminescence spectroscopy.
- Knowledge of the wurtzite (Al,Ga)N material system and its peculiarities.
- Complementary experience in simulating contributions to the efficiency of LED devices.
- Proficiency in data analysis using Python.
- Motivated team player with a high level of communication skills.
Position and salary
This position is available from and is limited to 24 months. Salary and benefits are according to the Treaty for German public service (TVöD Bund) at the level of E13, taking work experience and special professional skills into account.
What we offer
- Modern laboratories with a wide range of experimental techniques.
- Supportive environment with experts for various scientific sub-fields.
- International and culturally diverse community.
- Location in the heart of Berlin with excellent public transport connections.
- Subsidized travel ticket.
- Possibility to participate in professional development and/or exchange programs.
- Mobile work.
About PDI
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. In the MBE department at PDI, a dedicated team of scientists, technicians, postdocs, and students operates 13 MBE systems for the synthesis of a wide range of material systems, including arsenides, nitrides, oxides, and 2D materials. This in-house collaborative environment offers abundant opportunities for both direct and indirect learning in various MBE technologies, making it an ideal place to start a career in the field.
For scientific information about the project, please contact Dr. Jonas Lähnemann ( ).
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.
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.
Among equally qualified applicants, preference will be given to candidates from marginalized groups. That means, we welcome every qualified application, regardless of sex and gender, origin, nationality, religion, belief, health and disabilities, age, or sexual orientation.
PDI follows our gender equality plan, so we want to engage women to apply at PDI to balance the gender ratio in science. Disabled applicants with equal qualifications and aptitude will be given preferential consideration.
How to apply
Please upload or email your application to: by . Your documents must include
- a dedicated cover letter
- CV
- diploma(s) and transcript(s)
- publication list (if exists)
- letter(s) of recommendation/contact information of references (if exist)
