Resumen

GUTIERREZ, R. et al. Optical and structural properties of CdS:Pb²⁺ nanocrystals. Rev. mex. fis. [online]. 2015, vol.61, n.4, pp.312-322. ISSN 0035-001X.

The goal of this work is to study the effects of doping on structural, morphological and optical properties of CdS thin films as a function of Pb²⁺ concentration. Thus, nanoparticles were synthesized by chemical bath and a thickness decrease of ~575-200 nm range was observed. In Fourier-transform infrared spectroscopy, all the samples showed a sharp stretching mode observed at ~1384 cm^-1 corresponding to the vibration mode of CO₃^-2. X-ray diffraction studies show that the size of crystallites is in the ~33-12 nm range. The peaks belonging to primary phase are identified at the 2θ = 26.5° and 2θ = 26.00°, corresponding to CdS and PbS respectively. Thus, a shift in maximum intensity peak from 2θ = 26.4° to 28.2° is observed. Likewise peaks at 2θ = 13.57°, 15.91° correspond to lead perchlorate thiourea. The optical, absorption, and transmission properties of the films were determined by UV-vis spectrophotometry, optical energy gap was found to range from 2.1 to 2.4 eV. Raman spectroscopy on doped films showed a shifting of these modes that can be attributed to strain, stress effects, defects, phonon confinement, and variation in phonon relaxation with grain size.

Palabras llave : Chemical bath; CdS; cell potential; nanoparticles; coordination complex; doping.

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