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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:42 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Structural, morphological and optical properties of PLD vitreous Nd-doped phosphate films (2)
Authors:
C. R. IORDANESCU, I. D. FERARU, M. ELISA
Affiliation:
National Institute of R & D for Optoelectronics INOE 2000, 409 Atomistilor Str.,
Magurele RO-077125, Romania
E-mail
iorda85@yahoo.com
Keywords:
doped phosphate films
Abstract:
Nd-doped phosphate thin films were fabricated by pulsed laser deposition (PLD) technique on silicon wafers using a Nd-doped Li2O-BaO-Al2O3-La2O3-P2O5 bulk target. Aiming the investigation of the structural properties and the uniformity of the films, the oxygen pressure and the substrate temperature were varied during the deposition process as follow: a) high vacuum and Ts=20 oC; b) pO2=1.5×10-3 Torr and Ts=20 oC; c) high vacuum and Ts=400 oC and d) pO2=1.5×10-3 Torr and Ts=400 oC.
The bonding features existing in the films were studied using micro-Raman spectroscopy and Fourier Transform Infrared spectroscopy (FTIR). The chemical characterization and the morphology of the films were investigated by Energy Dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). Fluorescence spectra were acquired for the phosphate target and for the deposited films. It was noticed that the specific molecular vibrations of the ablated target were reproduced in the fabricated PLD films. The obtained films show good uniformity and well preserved stoichiometry.
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