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2018 | OriginalPaper | Chapter

Au-Catalyst Assisted MOVPE Growth of CdTe Nanowires for Photovoltaic Applications

Authors : Virginia Di Carlo, Fabio Marzo, Massimo Di Giulio, Paola Prete, Nico Lovergine

Published in: Sensors and Microsystems

Publisher: Springer International Publishing

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Abstract

Vertically-aligned CdTe nanowire (NWs) were grown for the first time by metalorganic vapor phase epitaxy, using diisopropyl-telluride and dimethylcadmium as precursors, and Au nanoparticles as metal catalysts. The NWs were grown between 485 and 515 °C on (111)B-GaAs substrates, the latter overgrown with a 2-μm thick CdTe epilayer. To favor the Au-catalyst assisted process against planar deposition of CdTe, an alternate precursors flow process was adopted during NW self-assembly. Field emission electron microscopy observations and X-ray energy dispersive analyses of CdTe NWs revealed the presence of Au-rich droplets at their tips, the contact-angle between Au-droplets and NWs being ~130°. The NW height increases exponentially with the growth temperature, indicating that the Au-catalyzed process is kinetics-limited (activation energy: ~57 kcal/mol), but no tapering is observed. Low temperature cathodoluminescence spectra recorded from single NWs evidenced a band-edge emission typical of zincblend CdTe, and a dominant (defects-related) emission band at 1.539 eV.

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Metadata
Title
Au-Catalyst Assisted MOVPE Growth of CdTe Nanowires for Photovoltaic Applications
Authors
Virginia Di Carlo
Fabio Marzo
Massimo Di Giulio
Paola Prete
Nico Lovergine
Copyright Year
2018
Book
Sensors and Microsystems

Print ISBN: 978-3-319-66801-7

Electronic ISBN: 978-3-319-66802-4

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-66802-4_35