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Indirect optical transition due to surface band bending in ZnO nanotubes
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10.1063/1.3511345
/content/aip/journal/jap/108/10/10.1063/1.3511345
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/10/10.1063/1.3511345
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Figures

Image of FIG. 1.
FIG. 1.

[(a) and (b)] SEM images of ZNRs and ZNTs with average diameter of 120 nm; [(c) and (d)] SEM images of ZNRs and ZNTs with average diameter of 280 nm. (e) TEM image of ZNTs average diameter of 280 nm. (f) HRTEM images corresponding to the region marked by the dotted box in (e).

Image of FIG. 2.
FIG. 2.

(a) Room temperature PL spectra of ZNRs and ZNTs. (b) Room temperature TRPL spectra of ZNRs and ZNTs.

Image of FIG. 3.
FIG. 3.

Sketch of the energy band of the ZNRs and ZNTs with different type of surface depletion region. (a) ZNRs is partially depleted (b) ZNTs is thoroughly depleted.

Image of FIG. 4.
FIG. 4.

Temperature-dependent PL spectra for (a) ZNRs and (b) ZNTs.

Image of FIG. 5.
FIG. 5.

Temperature-dependent photon energy of and . Inset is the energy difference between and .

Image of FIG. 6.
FIG. 6.

Reciprocal temperature-dependent entire intensities of the ZNRs and ZNTs. The formulas and the solid lines in the figure are the result of simulation.

Image of FIG. 7.
FIG. 7.

Temperature-dependent TRPL spectra of ZNRs (a) and ZNTs (b). All the logarithmic decay behaviors have been fitted by a single exponential function of . The solid lines in the figure are the fitting curves.

Image of FIG. 8.
FIG. 8.

The fitted decay time constants from ZNRs and ZNTs as a function of temperature.

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/content/aip/journal/jap/108/10/10.1063/1.3511345
2010-11-19
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Indirect optical transition due to surface band bending in ZnO nanotubes
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/10/10.1063/1.3511345
10.1063/1.3511345
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