Anatase TiO[sub 2] thin films grown on lattice-matched LaAlO[sub 3] substrate by laser molecular-beam epitaxy

Murakami, M.; Matsumoto, Y.; Nakajima, K.; Makino, T.; Segawa, Y.; Chikyow, T.; Ahmet, P.; Kawasaki, M.; Koinuma, H.
April 2001
Applied Physics Letters;4/30/2001, Vol. 78 Issue 18, p2664
Academic Journal
Epitaxial anatase thin films were fabricated on lattice-matched (-0.2%) LaAlO[sub 3] (001) substrates in the layer-by-layer fashion by laser molecular-beam epitaxy. X-ray diffraction and transmission electron microscope show the films to exhibit high crystallinity and atomically defined interfaces. By virtue of the adoption of LaAlO[sub 3] substrate, which is transparent to photoexcitation of TiO[sub 2], optical band gaps could be determined to be 3.3 eV at room temperature. A photoluminescence band due to recombination of self-trapped excitons was observed at 5 K to give the peak maximum at 2.2 eV. As a result of the high degree of orientation of the epitaxial films, anisotropic optical absorption was clearly observed. © 2001 American Institute of Physics.


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