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ISRN Nanotechnology
Volume 2012 (2012), Article ID 546027, 12 pages
http://dx.doi.org/10.5402/2012/546027
Research Article

Properties of PbS: Ni2+ Nanocrystals in Thin Films by Chemical Bath Deposition

1Laboratorio de Materials, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, C.U. Puebla, Pue. México, P.O. Box 1067, 72001 Puebla, PUE, Mexico
2Laboratorio de Síntesis de Complejos, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, P.O. Box 1067, 72001 Puebla, PUE, Mexico

Received 26 April 2012; Accepted 19 June 2012

Academic Editors: K. G. Beltsios and Y. Song

Copyright © 2012 O. Portillo Moreno et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The growth of nanocrystalline PbS films by chemical bath deposition (CBD) onto glass at temperature ๐‘‡ = 2 0 ยฑ 2 โˆ˜ C is presented in this research. We report on the modification of structural, optical, and electrical nanostructures due to in situ Ni-doping. The morphological changes of the layers were analyzed using SEM, AFM, and TEM. XRD spectra displayed peaks at 2θ = [26.00, 30.07, 43.10, 51.00, 53.48], indicating growth on the zinc blende face. The grain size determined by X-rays diffraction of the undoped samples was โˆผ 36 nm, whereas with the doped sample was 3.2–5 nm. By TEM, the doped PbS was found crystalline films in the range 3.5–5 nm. Optical absorption (OA), and forbidden bandgap energy ( ๐ธ ๐‘” ) shift disclose a shift in the range 2.1–3.8 eV. Likewise, the dependence of ๐ธ ๐‘” with the radius size and interplanar distance of the lattice is discussed. Raman spectroscopy (RS) exhibited an absorption band โˆผ 135 cm−1 displaying only a PbS ZB structure. The thermal energy for the films was determined from the slope of dark conductivity (DC) and the energy was estimated to be 0.15 to 0.5 eV.