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B02: Nonlinear optics and coherent intersubband physics of cubic GaN/Al(Ga)N heterostructures

M. Sc. Michael Deppe
Molecular beam epitaxy (MBE)

M. Sc. Michael Deppe, AG As

What is the challenge of my research project?
My focus is the fabrication of cubic group III-nitrides by plasma-assisted molecular beam epitaxy. Since the growth of the metastable cubic phase only occurs in a small process window, precise control of the growth conditions is required. As a benefit, spontaneous and piezoelectric polarization fields, which occur in the thermodynamically stable hexagonal III-nitrides, are absent in the cubic III-nitrides. This effect can improve the performance of devices.
In the framework of project B02 I fabricate cubic GaN/Al(Ga)N heterostructures which feature intersubband transitions in the near-infrared spectral region. These structures are used to investigate nonlinear properties of the material. By employing germanium as a novel donor for the cubic nitrides, I aim to achieve a strengthening of these effects.
Besides the fabrication of samples, also the characterization plays a significant role for the work in my project. Different techniques like X-ray diffraction, atomic force microscopy and photoluminescence spectroscopy are utilized to analyze and improve the quality of the structures.

Why am I eager to do it? Why did I chose this project?
Molecular beam epitaxy is a powerful but challenging technology. Together with the manifold techniques for analysis of samples, it offers a highly interesting and diversified opportunity to explore new semiconductor structures and their applications.