Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Nanostructured surfaces and thin films

O 54.2: Talk

Wednesday, March 11, 2026, 10:45–11:00, HSZ/0201

Systematic Investigation of Colloidal Au Nanoparticles for High-Density III-V Nanowire Growth — •Pavithira Manoharan, Chris Yanic Bohlemann, Peter Kleinschmidt, Thomas Hannappel, and Juliane Koch — Fundamentals of Energy Materials,Technical University of Ilmenau, 98693 Ilmenau, Germany

Over the past two decades, nanoscale structures such as III-V nanowires (NWs) have become versatile components for electronic and photonic applications, including high-performance photovoltaic and photoelectrochemical systems. Many simulation studies show that the density and lateral arrangement of NWs play a decisive role in optimizing light absorption, charge separation, and surface reactions. However, growing ordered NW arrays remains technologically challenging and costly. In this work, we present a simple and cost-effective method for producing high-density, disordered III-V NW using commercially available Au colloid solutions as a source of the catalyst particles. We perform a systematic study on how experimental parameters, such as surface preparation and substrate deposition conditions, affect the resulting nanowire density and diameter. This comprehensive approach provides insight into catalyst behavior prior to the vapor-liquid-solid growth and enables controlled modification of the NW structures. We also evaluate the limitations and potential of this method for NW-based energy conversion architectures.

Keywords: nanowires; colloid solutions; density; photovoltaic; photoelectrochemical