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Optical band-gap determination of nanostructured film
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View: Figures


Image of FIG. 1.
FIG. 1.

Room temperature PA signal of the nanostructured film as a function of photon energy. The continuous line represents the typical PA signal with modulated light. The other curves stand for PA signal under both modulated and continuous excitations with 50 mW at 2.71 eV (dashed) and 150 mW at 3.48 eV (dotted). The direct band gap is obtained from the crossing point of PA signal with and without continuous excitation (shown in the inset).

Image of FIG. 2.
FIG. 2.

Total absorption spectra of the film for monoclinic, tetragonal, and cubic crystalline structures, including a Lorentzian broadening of 0.1 eV. For comparison, the experimental PA curve was also included. The inset shows the relative intensity of as a function of photon energy near the fundamental absorption edge at room temperature. The dotted line crosses the energy axis at for PAS data. In the case of the theoretical cubic crystalline structure, stands for the absorption coefficient, and the dashed line intercepts the abscissa energy at 2.54 eV.

Image of FIG. 3.
FIG. 3.

Electronic bands for in cubic structure, calculated along the two main symmetry directions. We show both the (solid lines) and the (marks) results, in which the conduction bands of have been shifted by for better comparison with the energy bands. Energies are referred to the valence band maximum (dotted line). The band edges along (100) show very flat energy dispersions which will enhance the optical absorption at higher temperature due to phonon-assisted transitions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical band-gap determination of nanostructured WO3 film