Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence

Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence

ZnO nanowires were grown by vapor-transport and deposition on Au nanocluster covered fused and thermal silica and c-Si. The nanowire size and density depended strongly on the substrate type. By decreasing the O 2 to local Zn partial pressure ratio, the growth pattern changed to nanocombs and nanoshe...

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Veröffentlicht in:Applied physics letters 2012-06, Vol.100 (23), p.233116-233116-4
Hauptverfasser: Grinblat, G., Capeluto, M. G., Tirado, M., Bragas, A. V., Comedi, D.
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creator Grinblat, G.
Capeluto, M. G.
Tirado, M.
Bragas, A. V.
Comedi, D.
description ZnO nanowires were grown by vapor-transport and deposition on Au nanocluster covered fused and thermal silica and c-Si. The nanowire size and density depended strongly on the substrate type. By decreasing the O 2 to local Zn partial pressure ratio, the growth pattern changed to nanocombs and nanosheets. ZnO nanohedgehogs were found on bare c-Si. We observe a remarkable correlation between the defect to exciton photoluminescence intensity ratio and the nanostructures specific surface areas. These results indicate that changes in strain and O deficiency defects at surfaces are behind the observed morphology changes, one to two-dimensional growth transition, and corresponding luminescence.
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title Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence
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