Bi influence on growth and physical properties of chemical deposited PbS films

PbS thin films with thickness between 100 and 150 nm were grown for the first time by microwave-assisted chemical bath deposition in a commercial automated system with deposition times not exceeding 5 min. X-ray diffraction analysis shows that the thin films have cubic rock salt type structure with good crystallinity. The grain size increased from 18 to 20 nm, as the deposition time increased. Energy dispersive X-ray results confirm that the films are stoichiometric. Optical measurements show that thin films have relatively high absorption coefficients between 104 and 105 cm-1 in the visible range. In addition, the films exhibit a direct gap, within the energy range from 1.0 to 1.35 eV. The electrical properties, such as conductivity, the Seebeck coefficient, carrier concentration, and carrier mobility, are discussed.

show abstract

“…Additionally, the hydrolysis of thioacetamide, CH 3 CSNH 2 , takes place in the solution which releases S 2− ions as follows [25]:…”

Section: Reaction Mechanism the Reaction Mechanism For Forming Pbs Tmentioning

confidence: 99%

Effect of Deposition Time on the Optoelectronics Properties of PbS Thin Films Obtained by Microwave-Assisted Chemical Bath Deposition

Barrios‐Salgado

Rodrı́guez-Lazcano

Pérez-Orozco

et al. 2019

Advances in Condensed Matter Physics

View full text Add to dashboard Cite

show abstract

“…To enhance the electrical and optical properties of PbS films, doping has been tried by different investigators and enhanced physical properties has been achieved. [9][10][11][12][13] To obtain PbS thin films with wide optical band gap and improved electrical conductivity, other suitable dopant which does not alter the PbS crystal structure should be identified. Cadmium sulphide (CdS) is an important wide band gap semiconductor with Bohr atomic radius of 2?4 nm and direct band gap of 2?43 eV.…”

Section: Introductionmentioning

confidence: 99%

Properties of Cd doped PbS thin films: doping concentration effect

Rajashree¹,

Balu²,

Nagarethinam³

2015

Surface Engineering

View full text Add to dashboard Cite

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.

show abstract

“…2a. Instead of the well defined cubic shape of the crystallites in the macroscopic PbS of 250-300 nm in size [11], one can notice here rounded shapes and smaller sizes, i.e. less than 100 nm.…”

Section: Pbs Layers On Glass Substratesmentioning

confidence: 81%