Deposition of conductive TiN shells on SiO<sub>2</sub> nanoparticles with a fluidized bed ALD reactor

Journal article (2016)

Authors

A.P. Didden ChemE/Materials for Energy Conversion and Storage - AS
Philipp Hillebrand Helmholtz-Zentrum Berlin
Markus Wollgarten Helmholtz-Zentrum Berlin
B. Dam ChemE/Materials for Energy Conversion and Storage - AS
Roel van de Krol Helmholtz-Zentrum Berlin
Research Group
ChemE/Materials for Energy Conversion and Storage (AS) (TU Delft)
Atomic layer deposition Fluidized bed Conductive shells Core–shell particles Microelectronic contacts Titanium nitride
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Published Date

01-02-2016

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Materials for Energy Conversion and Storage

Abstract

Conductive TiN shells have been deposited on SiO2 nanoparticles (10–20 nm primary particle size) with fluidized bed atomic layer deposition using TDMAT and NH3 as precursors. Analysis of the powders confirms that shell growth saturates at approximately 0.4 nm/cycle at TDMAT doses of >1.2 mmol/g of powder. TEM and XPS analysis showed that all particles were coated with homogeneous shells containing titanium. Due to the large specific surface area of the nanoparticles, the TiN shells rapidly oxidize upon exposure to air. Electrical measurements show that the partially oxidized shells are conducting, with apparent resistivity of approximately ~11 kΩ cm. The resistivity of the powders is strongly influenced by the NH3 dose, with a smaller dose giving an order-of-magnitude higher resistivity.