PbS nanostructured thin films by in situ Cu-doping.
PbS:Cu nanocrystalline films were prepared by chemical bath at temperature of 80 degrees C and deposited on glass substrates. Different Cu-doping levels were obtained changing the volume of the Cu-reagent-solution into the PbS growing solution. X-ray diffraction (XRD) and optical absorption (OA) measurements were carried out to characterize the semiconductor. The morphological changes of the layers were analyzed using an atomic force microscopy. Diffraction X-ray spectra displayed peaks at 2 theta = (26.00, 30.07, 43.10, 51.00 and 53.48), indicating growth on the zinc blende face. The grain size determined by X-rays diffraction of the undoped samples, was found -37 nm, whereas with the doped sample was - 32-25 nm. Raman spectra reports strong band in - 133-140 cm(-1) attributed to a combination of longitudinal and transversal acoustic modes. Optical absorption, forbidden band gap energy (E(g)) shift disclose a shift in the range 1.4-2.4 eV. Gibbs free energy calculation for the Cu doping PbS is also included heading.
R
R
Palomino-Merino
O
O
Portillo-Moreno
J C
JC
Flores-García
J
J
Hernández-Tecorralco
J
J
Martínez-Juárez
A
A
Moran-Torres
E
E
Rubio-Rosas
G
G
Hernández-Téllez
R
R
Gutiérrez-Pérez
L A
LA
Chaltel-Lima