Properties of Cd doped PbS thin films: doping concentration effect

Abstract

Highly crystalline cadmium doped lead sulphide (PbS:Cd) thin films with different Cd doping concentrations (0, 2, 4, 6 and 8 at-%) were fabricated on glass substrates using spray pyrolysis technique. The X-ray diffraction (XRD) studies revealed that all the films exhibit face centred cubic structure with a preferential orientation along the (2 0 0) plane irrespective of Cd doping concentration. Optical studies showed that the band gap of doped films vary between 1?96 and 2?12 eV with increasing Cd content and the film coated with 6 at-% Cd dopant has a maximum transmittance of nearly equal to 77%. Electrical studies revealed that the film coated with 6 at-%Cd dopant has a maximum conductivity of 12?67610 21 V cm 21 . The obtained results infer that the PbS:Cd film coated with 6 at-%Cd dopant has better structural, morphological, optical and electrical properties.

Effect of double substitutions of Cd and Cu on optical band gap and electrical properties of non-colloidal PbS thin films

“…There have been several studies on Cd-substituted PbS thin films [12,18]. Depending on the content of Cd content, different crystal structure and optical properties were reported since CdS has a hexagonal wurzite structure compared to the cubic structure of PbS [12].…”

Investigations on the structural, morphological, optical and electrical properties of undoped and nanosized Zn-doped CdS thin films prepared by a simplified spray technique

“…A blue shift in the absorption edge is observed for the film coated with 2 at.% Zn doping concentration and a red shift is observed for the films coated with higher Zn doping concentration. Optical band gap E g of the films can be estimated from the Tauc plot [29]:…”

Optimization of S:Sn precursor molar concentration on the physical properties of spray deposited single phase Sn2S3thin films

“…where A is an energy independent constant and the exponent 'n' depends on the type of transition (n = 1/2, 2, 3/2 and 3 for allowed direct, allowed indirect, forbidden direct and forbidden indirect transitions, respectively) [17]. The direct band gap values are determined from the Tauc's plots (Fig.…”