The growth and conductivity of nanostructured ZnO films grown on Al-doped ZnO precursor layers by pulsed laser deposition

The structure and electrical properties of nanostructured Al-doped ZnO (AZO)/ZnO bilayers grown as potential solar cell electrodes by pulsed laser deposition on (0001) sapphire substrates are investigated. Transmission and scanning electron microscopy and X-ray diffraction show a narrow temperature...

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Bibliographic Details
Published in:Ceramics international 2014-07, Vol.40 (6), p.8389-8395
Main Authors: Kumarakuru, Haridas, Cherns, David, Collins, Andrew M.
Format: Article
Language:English
Subjects:
Al-doped ZnO (AZO) and ZnO thin films
Aluminum
Azo
Electrical resistivity
Electrodes
Nanostructure
Pulsed laser deposition
Pulsed laser deposition (PLD)
Resistivity
Scanning electron microscopy (SEM)
Transmission electron microscopy (TEM)
Tunnelling atomic force microscopy (TUNA)
Zinc oxide
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Summary:The structure and electrical properties of nanostructured Al-doped ZnO (AZO)/ZnO bilayers grown as potential solar cell electrodes by pulsed laser deposition on (0001) sapphire substrates are investigated. Transmission and scanning electron microscopy and X-ray diffraction show a narrow temperature window around 350–450°C where nanostructures are formed. 2-D mapping of electrical conductivity by tunnelling atomic force microscopy showed that these nanostructures provided low resistance pathways, but that the overall film resistivity increased for substrate temperatures above 350°C. The reasons for this are discussed.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.01.045