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

  • Virginia Di Carlo
  • Fabio Marzo
  • Massimo Di Giulio
  • Paola Prete
  • Nico Lovergine
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 457)


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.


CdTe nanowires Au-catalyzed growth Metalorganic vapor phase epitaxy Cathodoluminescence 



The authors would like to acknowledge the financial support of the Ministry for Education, University and Research (MIUR) of Italy through the PON-R&C project INNOVASOL (project no. PON02-00323-3858246).


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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Virginia Di Carlo
    • 1
  • Fabio Marzo
    • 1
  • Massimo Di Giulio
    • 2
  • Paola Prete
    • 3
  • Nico Lovergine
    • 1
  1. 1.Dipartimento di Ingegneria dell’InnovazioneUniversità del SalentoLecceItaly
  2. 2.Dipartimento di Fisica e Matematica “E. De Giorgi”Università del SalentoLecceItaly
  3. 3.Istituto per la Microelettronica e Microsistemi del CNRLecceItaly

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