Journal Article

FZJ-2016-06850

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dense, Regular GaAs Nanowire Arrays by Catalyst-Free Vapor Phase Epitaxy for Light Harvesting

Jin, J.FZJ* ; Stoica, T.FZJ* ; Trellenkamp, S.PGI-8-PT* ; Chen, Y.FZJ* ; Anttu, N.FZJ* ; Migunov, V.FZJ* ; Kawabata, R.FZJ* ; Buenconsejo, P. J. S.Extern* ; Lam, Y. M.Extern* ; Haas, F.FZJ* ; Hardtdegen, H.FZJ* ; Grützmacher, D.FZJ* ; Kardynal, B. (Corresponding author)FZJ*

2016
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsami.6b05581

Abstract: 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.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. PGI-8-PT (PGI-8-PT)
3. Mikrostrukturforschung (PGI-5)
4. JARA-FIT (JARA-FIT)

Research Program(s):

1. 521 - Controlling Electron Charge-Based Phenomena (POF3-521) (POF3-521)

Appears in the scientific report 2016

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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