Dense, Regular GaAs Nanowire Arrays by Catalyst-Free Vapor Phase Epitaxy for Light Harvesting

Jiehong Jin, Toma Stoica, Stefan Trellenkamp, Yang Chen, Nicklas Anttu, Vadim Migunov, Rudy M.S. Kawabata, Pio J.S. Buenconsejo, Yeng M. Lam, Fabian Haas, Hilde Hardtdegen, Detlev Grützmacher, Beata E. Kardynał*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)


Density dependent growth and optical properties of periodic arrays of GaAs nanowires (NWs) by fast selective area growth MOVPE are investigated. As the period of the arrays is decreased from 500 nm down to 100 nm, a volume growth enhancement by a factor of up to four compared with the growth of a planar layer is observed. This increase is explained as resulting from increased collection of precursors on the side walls of the nanowires due to the gas flow redistribution in the space between the NWs. Normal spectral reflectance of the arrays is strongly reduced compared with a flat substrate surface in all fabricated arrays. Electromagnetic modeling reveals that this reduction is caused by antireflective action of the nanowire arrays and nanowire-diameter dependent light absorption. Irrespective of the periodicity and diameter, Raman scattering and grazing angle X-ray diffraction show signal from zinc blende and wurtzite phases, the latter originating from stacking faults as observed by high resolution transmission electron microscopy. Raman spectra contain intense surface phonons peaks, whose intensity depends strongly on the nanowire diameters as a result of potential structural changes and as well as variations of optical field distribution in the nanowires.

Original languageEnglish
Pages (from-to)22484-22492
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number34
Publication statusPublished - 31 Aug 2016
MoE publication typeA1 Journal article-refereed


  • GaAs nanowires
  • metalorganic vapor phase epitaxy
  • optical spectroscopy
  • Raman spectroscopy
  • selective area growth


Dive into the research topics of 'Dense, Regular GaAs Nanowire Arrays by Catalyst-Free Vapor Phase Epitaxy for Light Harvesting'. Together they form a unique fingerprint.

Cite this