Vorträge und Posterpräsentationen (ohne Tagungsband-Eintrag):

P. Pertl, M. Seifner, A. Lugstein, S. Barth:
"Low Temperature Synthesis of Germanium Nanorods and Nanowires";
Vortrag: 17th Austrian Chemistry Days 2017, Salzburg; 25.09.2017 - 27.09.2017.

Kurzfassung englisch:
Semiconductor nanowires are very promising building blocks for devices and at the same time ideal model systems to study materials properties [1]. Germanium nanowires and nanorods have a broad spectrum of potential applications including electronic and optoelectronic devices, lithium ion batteries, sensors etc. The synthesis of these
anisotropic nanostructures usually requires temperatures >300 °C hampering the growth on temperature-sensitive materials such as polymers. We present in this contribution the growth of highly crystalline Ge nanowires and nanorods at temperatures as low as 170 °C. These structures grow either via the solution-liquid-solid (SLS) or the vapor-liquid-solid (VLS) mechanism depending on
the growth conditions. In addition, we can show that the slow growth of these structures at low temperatures is due to the precursor decomposition characteristics as a limiting
factor. Moreover, the decomposition of the Ge precursor is catalyzed by the presence of Ga seeds since no decomposition products are obtained in their absence. Ge nanowires have been characterized by different analytical methods including TEM, EDX as well
as XRD and the incorporation of unusually high Ga contents of up to 3% in the Ge
structures has been observed. Such unusually high catalyst incorporation in group IV
nanowires has been observed for other semiconductor/metal combinations [3] and
helped targeting metastable compositions [4]. Therefore, electrical characterization of
individual Ge nanowires has been performed in order to quantify the impact of the Ga
incorporation on their conductivity. According to the phase diagram, Ga has excellent
potential for the Ge nanowire formation at even lower temperatures using suitable Ge
precursors, which will be targeted in future studies.
[1] S. Barth, F. Hernandez-Ramirez, et.al. Prog. Mater. Sci. 2010, 55, 563.
[2] O. Moutanabbir, D. Insheim, et.al. Nature 2013, 496, 78.
[3] M. S. Seifner, F. Biegger, A. Lugstein, J. Bernardi, S. Barth Chem. Mater. 2015, 27, 6125

Elektronische Version der Publikation:

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.