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Properties of green-light-emitting anodic layers formed on Si substrates in mixed solution
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10.1063/1.3142425
/content/aip/journal/jap/105/11/10.1063/1.3142425
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/11/10.1063/1.3142425
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Plane and (b) cross-sectional SEM images for anodic layer formed in solution on substrate at for .

Image of FIG. 2.
FIG. 2.

PL spectrum evolution in anodic layer formed at for . The PL measurements were performed by illuminating UV light at (He–Cd laser) for to 390 s in steps of 27 in air. The excitation light was illuminated only when each PL spectrum was taken (i.e., for a time less than 1 s).

Image of FIG. 3.
FIG. 3.

(a) Normalized integrated PL intensity and (b) PL peak wavelength vs air exposure time for anodic layer formed at for . The solid lines in (a) and (b) show the results calculated using Eqs. (1) and (2), respectively.

Image of FIG. 4.
FIG. 4.

PL spectrum vs anodic current density for anodic layers formed in solution for .

Image of FIG. 5.
FIG. 5.

(a) Integrated PL intensity and (b) PL peak wavelength vs anodic current density for anodic layers formed for .

Image of FIG. 6.
FIG. 6.

PL spectrum vs anodic time for anodic layers formed in solution at anodic current density .

Image of FIG. 7.
FIG. 7.

(a) Integrated PL intensity and (b) PL peak wavelength vs anodic time for anodic layers formed at .

Image of FIG. 8.
FIG. 8.

PL spectrum evolution in anodic layer formed at for . The as-prepared samples were immersed in (a) concentrated HCl and (b) methanol. The PL measurements were performed using a He–Cd laser as an excitation light source for to 60 s in intervals of 15 s. The excitation light was continuously illuminated on the anodic surfaces from the start to the end of the experiment.

Image of FIG. 9.
FIG. 9.

(a) Normalized integrated PL intensity and (b) PL peak wavelength vs UV (He–Cd laser) illumination time immersed in concentrated HCl and methanol for anodic layers formed at for .

Image of FIG. 10.
FIG. 10.

PL and PLE spectra for as-prepared anodic layer measured in concentrated HCl solution. The PLE spectrum was measured by monitoring at . For comparison, the dashed line shows the PLE spectrum obtained for a PSi sample formed in a conventional HF/methanol electrolyte and subsequently photo-oxidized under UV illumination for 1 h.

Image of FIG. 11.
FIG. 11.

(a) XPS survey and (b) Si spectra in anodic layer formed in solution at for . For comparison, the XPS data for a HF-cleaned sample are plotted in (a) by the light solid line and in (b) by the open circles.

Image of FIG. 12.
FIG. 12.

FTIR spectra of (a) HF-cleaned and (b) anodic layer formed in solution at for .

Image of FIG. 13.
FIG. 13.

PL spectra for anodic layer formed in a solution at for and exposed to air for (a) (as-prepared), (b) 180, and (c) 390 s (Fig. 2). The dashed lines represent the deconvolution of each spectrum into two Gaussian peaks P1 and P2. The thick solid lines show the sum of these two peaks. Note that the PL spectrum in (c) can be fit well by considering only an orange peak (P1).

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/content/aip/journal/jap/105/11/10.1063/1.3142425
2009-06-10
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Properties of green-light-emitting anodic layers formed on Si substrates in HF/MnO2 mixed solution
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/11/10.1063/1.3142425
10.1063/1.3142425
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