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Microstructure, composition, and optical properties of PbTiO3 thin films prepared by the sol-gel method

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5 Author(s)
Lu, C.J. ; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China ; Ren, S.B. ; Shen, H.M. ; Liu, J.S.
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Crack-free and transparent PbTiO3 thin films with a perovskite structure were deposited on NaCl (100), Si(111), and fused quartz substrates by the sol-gel method. The crystal structure, morphology, domain structure, composition, and optical properties of the films were characterized by means of x-ray diffraction, transmission electron microscopy, scanning electron microscopy, x-ray photoelectron spectroscopy (XPS), and optical transmission spectrum. The films on Si and fused quartz substrates exhibit slight a axis preferred orientation, while the films on NaCl substrates show slight c axis preferred orientation. From XPS analysis, no residual carbon or other impurity element was detected on the films after 3 keV Ar+ cleaning. The chemical composition of the films was found to be stoichiometric. A great amount of absorbed oxygen exists on the surfaces of the films. In the fine-grained (≈150 nm) films, no 90° domains are present in most of the grains, while some grains show lamellar 90° domains. A large number of pores exist in the films and their sizes are in the range of 5–30 nm. The packing density of the film fired at 600 °C was estimated to be about 89.3% from its optical transmission spectrum. The film has a surface roughness Δd≈37.5 nm. The refractive index of the film is approximately 2.43 at 630 nm, and the absorption edge is at 321 nm. © 1997 American Vacuum Society.

Published in:

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films  (Volume:15 ,  Issue: 4 )

Date of Publication:

Jul 1997

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