Self-assembled island formation of LiNbO3 by pulsed laser deposition on α-Al2O3 substrate
1998; Elsevier BV; Volume: 127-129; Linguagem: Inglês
10.1016/s0169-4332(97)00662-4
ISSN1873-5584
AutoresGwangHee Lee, Mamoru Yoshimoto, Hideomi Koinuma,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoAbstract LiNbO 3 (0001) films were grown epitaxially on α -Al 2 O 3 (0001) substrate by pulsed laser deposition (PLD). The initial growth of LiNbO 3 film on atomically flat sapphire ( α -Al 2 O 3 ) substrates has been investigated by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The two-dimensional LiNbO 3 layer with thickness of about 1 nm was formed before three-dimensional growth occurred. Subsequently grown islands were distributed uniformly on the terrace surface. This result indicates that the LiNbO 3 grows in the Stranski–Krastanov growth mode. Judging from X-ray 2 θ – θ diffraction (XRD) and reflection high-energy electron diffraction (RHEED) patterns, high quality epitaxial film was obtained. And, the film emitted visible photoluminescence (PL) at room temperature.
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