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M.Sc. David Busse

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Semiconductor Nanostructures and Quantum Systems

Offered Bachelor’s or Master’s Theses Topics

Searching for lasing in hexagonal SiGe nanowires

Fully merging thefields of integrated electronics and photonics is the major goal of distributed information processing today. However, a fundamental bottleneck is that cubic Si and Ge are both indirect bandgap semiconductors, which cannot emit light efficiently. Achieving efficient light emission from group-IV materials has been a holy grail in silicon technology for decades, but despite tremendous efforts, this has not been achieved.  Recently, the hexagonal crystal phase of Ge has been predicted to be a direct gap semiconductor, opening up a new route to achieving efficient light emitters on the basis of group IV semicodnuctors.  Growing hexagonal Ge and SiGe is non-trivial, but recently our collaboration partners have succeded.

In this thesis you will work as part of a team in close collaboration with several research groups from the Netherlands, U.K., Austria and Switzerland. You will perform spatially resolved optical spectroscopy on hex-Ge and SiGe nanowires to test the nature of their electronic bandstructure, increase the efficiency of their emission and, hopefully, demonstrate that they are indeed capable of emitting light efficiently.  You will learn about (near)infrared optics, cryogenics and contribute to this exciting research field.  You should be highly motivated, have ambition to work in a leading experimental physics group and sometimes willing to travel to consortium meetings to help discuss our results.

Interested ?  Contact Prof Finley or David Busse for more information on the thesis and to look around our laboratories.

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Jonathan Finley
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