Preparation of nanocrystalline Cd-doped PbS thin films and their structural and optical properties

Abstract

PbS and Cd-doped PbS nanocrystalline thin films prepared by the chemical bath deposition technique was deposited onto glass substrates at 80 • C. The aqueous solution containing Cd 2+ and Pb 2+ precursors was used to obtain good quality film deposits at optimized preparative parameters. The characterization of these films was performed using X-ray diffraction, optical absorption, photoluminescence properties, scanning electron microscopy and energy dispersive X-ray analyses to explore the properties of the PbS and Cd-doped PbS films. The prepared films were adherent to the substrate and well crystallized according to the cubic structure, which displayed a preferred orientation. According to the X-ray diffraction analysis, the crystallite size of the films decreased from 74 nm to 64 nm with increasing Cd doping. The optical properties were determined from ultraviolet-visible spectroscopy measurements in the absorbance energy range from 300-1200 nm. The UV-visible analysis shows that the band gap value of the PbS thin films increased from 2.12 eV to 2.65 eV by doping with Cd. Morphological analysis showed that the shape of the grains over the substrate surface was changed from a regular random orientation to an irregular shape with Cd doping. The energy dispersive X-ray analysis showed that the film contains Cd, Pb and S elements without any other impurities.

Effect of Deposition Time on Structural and Optoelectronic Properties of Flower-Like Nanostructured PbS Thin Films

“…The sample PbS-1 with 1 h growth time exhibits low intense PL peaks at 448 and 464 nm. Similar observation has been reported by Rajathi et al and according to them the peaks are due to the transitions in nano-crystalline PbS lattice [30]. But the samples PbS-2 and PbS-3 show emergence of emission peaks at 613 and 737 nm at the same excitation of 450 nm.…”

Study of Optical Property of CD Doped PBS Nanocrystalline Thin Films Fabricated by Chemical Bath Deposition Technique

“…The size of CdPbS crystal for (200) orientation is found to be 27.24 nm which is also smaller than that of pure PbS crystal. Thus, the doping of cadmium also decreases the crystallite size which is in line with reports of earlier workers [26].…”

Morphological and structural features of the CdxPb1−xS films obtained by CBD from ethylenediamine-citrate bath

“…Also, we can note relative simplicity of their preparation. Many researchers prefer chemical deposition from aqueous solutions (chemical bath deposition, CBD) [1][2][3][4][5][8][9][10][11][12][13][14][15][16][17][18][19][20]. This method allows obtaining Cd x Pb 1−x S solid solutions both in powder and thin-film states on substrates of any nature and configuration without complex technological equipment.…”