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M.Sc. Tobias Schreitmüller

Offered Bachelor’s or Master’s Theses Topics

Elektrisch stimulierte Nanodrahtlaser als neuartige Lichtquelle für die Silizium Photonik


III-V semiconductor nanowire lasers combine the superior optical properties of the established III-V materials with the possibility of a site-selective and monolithic integration on a common silicon-on-insulator platform. Their recent integration on silicon waveguides marked a crucial milestone towards their usage as coherent light sources for future silicon photonics applications. However, so far pumping of nanowire lasers is done opticallywhile electrical injection is crucial for a useful application as on-chip light source.

The goal of this M.Sc. project is the realization of standing nanowire lasers on a silicon platform and the characterization of their electrical and electro-optical properties. Hereby, you will be closely working together with a PhD student. Your work will be settled over the whole fabrication process line from the first design of sophisticated nanowire heterostructures over their fabrication further to their analysis. The design will be guided by simulations for optimized laser cavity properties as well as electronic simulations of the doped heterostructures. Nanowire lasers should then be realized on lithographically patterned substrates by various bottom-up/top-down nanofabrication processes, including state-of-the-art processing in cleanroom environment. From electrical and optical characterization of the wires you should derive correlations between heterostructure design, electronic properties, contact behavior and electroluminescence to drive the optical emission properties of the nanowires into the lasing regime.


Experience in the area of clean room fabrication and nanoanalytics as well as experience in simulations would be beneficial. Furthermore, some data analysis skills would be good:

·     Python or MATLAB

·     Origin

·     MS Office

Nevertheless, the most important requirements are motivation and commitment.  

What you will gain and learn

·     Advanced clean room processes for state-of-the-art 3D structured nanowires

·     Nanoanalytics and imaging techniques (SEM, AFM)

·     Expertise in measurements of electrical and optical properties of nanowire heterostructures (Low-noise I-V characterization, Photo- & Electroluminescence spectroscopy)

In summary, you are going to develop hands-on experience on a substantial pool of nanofabrication and -analytics methodologies available at WSI/ZNN, while contributing to a technologically and scientifically extremely relevant topic in integrated photonics. Additionally, you will get the chance to work in a top semiconductor research institute with a productive working atmosphere and a great team spirit.


If you are interested in this topic or if you have any questions please send a mail to or Please include your CV, transcript of records and your Bachelor’s Thesis.

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Gregor Koblmüller
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