Abstract
Amorphous stoichiometric Pb(Zr x Ti1 − x)O3) (PZT) thin films with various values of x were deposited on Si(100) substrates by the sol-gel technique. The influence of Ti content on the optical properties was studied by spectroscopic ellipsometry (SE) in the UV-visible region. Using a four-phase fitting model, the refractive index n and extinction coefficient k was obtained by analyzing the SE spectra. The optical band gap energies E g for these films were reported under the assumption of a direct band-to-band transition. It has been found that the refractive index, extinction coefficient and band gap energy of the films were functions of the film compositions. The refractive index of the PZT films increases linearly with increasing Ti content. On the other hand, the optical band gap energy of the PZT films decreases with increasing Ti content.
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References
J. F. Scott and C. A. Paz De Arajuo, Science 246 (1993) 1400.
Y. Xu, in “Ferroelectric Materials and Their Applications” (North-Holland, Amsterdam, 1991) p. 206.
K. Iijima, Y. Tomita, R. Takayama and I. Ueda, J.Appl.Phys. 60 (1986) 361.
H. Adachi, T. Mitsuyu, O. Yamazaki and K. Wasa, ibid. 60 (1986) 736.
D. L. Polla and L. F. Francis, Annu.Rev.Mater.Sci. 28 (1998) 263.
Y. Xu, C. H. Cheng and J. D. Mackenzie, J.Non-Cryst. Solids 176 (1994) 1.
Y. Xu and J. D. Mackenzie, ibid. 246 (1999) 136.
S. Trolier-MCKINSTRY, H. Hu, S. B. Krupanidhi, P. Chindaudom, K. Vedam and R. E. Newnham, Thin Solid Films 230 (1993) 15.
S. Trolier-MCKINSTRY, J. Chen, K. Vedam and R. E. Newnham, J.Amer.Ceram.Soc. 78 (1995) 1907.
R. M. A. Azzam and N. M. Bashara, in “Ellipsometry and Polarized Light” (North-Holland, Amsterdam, 1977) p. 89.
A. R. Forouhi and I. Bloomer, Phys.Rev. B 34 (1986) 7018.
M. M. Raham, G. L. Yu, K. M. Krishna, T. Soga, J. J. Wantanable, T. Jimbo and M. Umeno, Appl.Opt. 37 (1998) 691.
D. A. G. Bruggeman, Ann.Phys.Leipzig 24 (1933) 636.
G. E. Jellison, JR, Opt.Mater. 1 (1992) 41.
S. Kirkpatrick, C. D. Gelatt and M. P. Vecchi, Science 220 (1983) 671.
P. D. Thaacher, Appl.Opt. 16 (1977) 3210.
J. C. Tauc, in “Amorphous and Liquid Semiconductor” (Plenum Press, New York, 1974) p. 159.
G. H. Yi, Z. Wu and M. Sayer, J.Appl.Phys. 64 (1988) 2717.
K. Sreenivas, M. Sayer and P. Garrett, Thin Solid Films 172 (1989) 251.
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Yang, S., Mo, D. & Tang, X. Spectroscopic ellipsometry studies of amorphous PZT thin films with various Zr/Ti stoichiometries. Journal of Materials Science 37, 3841–3845 (2002). https://doi.org/10.1023/A:1019682817298
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DOI: https://doi.org/10.1023/A:1019682817298