Synthesis and microstructure of vertically aligned ZnO nanowires grown by high-pressure-assisted pulsed-laser deposition |
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Authors: | L C Tien S J Pearton D P Norton F Ren |
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Affiliation: | (1) Department of Materials Science and Engineering, National Dong Hwa University, Shoufeng, Hualien, 974, Taiwan;(2) Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA;(3) Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA |
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Abstract: | The microstructure and growth behavior for vertically aligned Zinc oxide (ZnO) nanowires, synthesized on a ZnO thin film template
by pulsed-laser deposition (PLD), is reported. The nanowire growth proceeds without any metal catalyst for nucleation, although
an epitaxial ZnO thin film template is necessary in order to achieve uniform alignment. Nanowire growth at argon or oxygen
background pressures of 500-mTorr results in nanowire diameters as small as 50–90 nm, with diameters largely determined by
growth pressure and temperature. Room temperature photoluminescence show both near-band-edge and deep-level emission. The
deep-level emission is believed caused by oxygen vancancies formed during growth. |
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