Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.70: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Selective Growth of Si Nanorods on Si Surfaces — L. Kühnemund1, •K. Meyer auf der Heide1, C. Tegenkamp1, H. Pfnür1, R. Brendel2, and J. Schmidt2 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Appelstraße 2, 30167 Hannover — 2Institut für Solarenergieforschung Hameln, Am Ohrberg 1, 31860 Emmerthal
The growth of silicon nanorods and in particular of highly ordered arrays of nanorods on surfaces are promising concepts for improving further the efficiency of photovoltaic devices. From a fundamental point of view such antenna structures in combination with ultra-thin metallic films or quantum wires are interesting assemblies for the study of opto-electrical conversion in low dimensional systems. However, the transition between the surface and the vertically grown rods is decisive.
In this study the morphology, the chemical composition of the rods and its vicinity as well as the transport properties of single rods have been investigated by means of a combined SEM-STM system. The Si-rods were grown via the VLS mechanism using metallic clusters (Au, Al) as catalyzer and silane as CVD precursor gas. Selective growth single rod structure was realized using electron beam lithography. It was found that after growth of the rods with diameters in between 100 nm and 1 µm, the area around the rod (1-2 µm) is contaminated with Au. As such effects limit the lifetimes of electron-hole pairs in photovoltaic cells other VLS catalyst materials such as Al, which forms only shallow acceptor states in Si, have been studied as well.