TITLE

Oxygen vacancy mediated enhanced photo-absorption from ZnO(0001) nanostructures fabricated by atom beam sputtering

AUTHOR(S)
Solanki, Vanaraj; Joshi, Shalik R.; Mishra, Indrani; Kabiraj, D.; Mishra, N. C.; Avasthi, D. K.; Varma, Shikha
PUB. DATE
August 2016
SOURCE
Journal of Applied Physics;2016, Vol. 120 Issue 5, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The nanoscale patterns created on the ZnO(0001) surfaces during atom beam irradiation have been investigated here for their photo absorption response. Preferential sputtering, during irradiation, promotes Zn-rich zones that serve as the nucleation centers for the spontaneous creation of nanostructures. Nanostructured surfaces with bigger (78 nm) nanodots, displaying hexagonal ordering and long ranged periodic behavior, show higher photo absorption and a ~0.09 eV reduced bandgap. These nanostructures also demonstrate higher concentration of oxygen vacancies which are crucial for these results. The enhanced photo-response, as observed here, has been achieved in the absence of any dopant elements.
ACCESSION #
117283321

 

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