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| Title: | Spectroellipsometric study of sol–gel derived potassium sodium strontium barium niobate films | Authors: | Mak, CL Lai, B Wong, KH Choy, CL Mo, D Zhang, YL |
Issue Date: | 15-Apr-2001 | Source: | Journal of applied physics, 15 Apr. 2001, v. 89, no. 8, p. 4491-4496 | Abstract: | Spectroscopic ellipsometry (SE) was used to characterize the sol–gel derived (K₀.₅Na₀.₅)₀.₄(Sr₀.₆Ba₀.₄)₀.₈Nb₂O₆(KNSBN) thin films as a function of sol concentration. In the analysis of the measured SE spectra, a modified double-layer Forouhi–Bloomer model was adopted to represent the optical properties of the KNSBN films. In this model, the films were assumed to consist of two layers—a bottom bulk KNSBN layer and a surface layer that composed of bulk KNSBN as well as void. Good agreement was obtained between the measured spectra and the model calculations in the chosen spectral region. Effective medium approximation theory was used to evaluate the effective refractive index for the surface layer. The results of SE have been correlated with atomic force microscopy measurements of surface roughness. Our analyses have shown that the surface layer had a lower refractive index than the bottom one. In addition, the refractive index and the surface roughness of the KNSBN films increase with the sol concentration. | Keywords: | Potassium compounds Sodium compounds Strontium compounds Barium compounds Ferroelectric thin films Sol-gel processing Refractive index Surface topography Atomic force microscopy Ellipsometry Visible spectra |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.1355283 | Rights: | © 2001 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in C. L. Mak et al., J. Appl. Phys. 89, 4491 (2001) and may be found at http://link.aip.org/link/?jap/89/4491. |
| Appears in Collections: | Journal/Magazine Article |
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| Mak_Spectroellipsometric _study_sol-gel.pdf | 675.81 kB | Adobe PDF | View/Open |
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