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Name (Title):
Makoto Sakurai (MANA scientist)
Affiliation:
International Center for Materials Nanoarchitectronics
(MANA), NIMS
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: SAKURAI.Makoto@nims.go.jp
Home Page:
Presentation Title:
Fabrication and characterization of individual ZnO nanowires
Abstract:
The electrical properties of individual ZnO nanowires were studied using two methods of
fabricating junctions between the nanowires and electrodes at room temperature [1]. The first was
based on the fabrication of electrodes onto a single nanowire using a lithography technique. ZnO
nanowires with metal electrodes had linear I – V curves when carriers were doped by the gate
voltage. ZnO nanowires whose carriers were doped by a chemical method demonstrated blue
shift in the main peak of the photoluminescence spectra and a linear relation in the I – V curves.
The second method involved manipulating the nanowires with AFM onto prepared electrodes
(see Fig.2). Ga-doped ZnO electrodes were found to make much better electrical contact with the
ZnO nanowires than metal electrodes. The optical properties of the nanowires were measured to
understand the behavior of exciton with long life time at room temperature. Based on the
experimental results, we discuss about the achievement of novel nanowire network devices.
Fig.1 SEM image of ZnO nanowires. Inset
shows that the nanowire has hexagonal
cross-section.
References :
[1] M. Sakurai, YG.Wang and M. Aono, submitted to Nanotechnology
Poster Session PS-1
Fig.2 Optical microscope images of ZnO nanowire
and metal electrodes taken (a) before and (b) after
AFM manipulation. (c) AFM image of ZnO
nanowires placed on metal electrode. (d) Crosssectional
line profiles of nanowire and electrodes
indicated by red triangles (red curve) and blue
triangles (blue curve) in AFM image.
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