Structural and Optical Characterizations of Cadmium Chalcogenide Layers on Polyamide Formed Using...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Polyamide (PA 6) is a versatile polymer with potential applications in electronics.
• Developing cost-effective and environmentally friendly methods for depositing semiconductor thin films is crucial for advanced material applications.
• Cadmium telluride (CdTe) and cadmium sulfide (CdS) are important semiconductor materials with tunable optical and electronic properties.

Purpose of the Study:

• To synthesize mixed cadmium telluride-cadmium sulfide (CdTe-CdS) thin layers on polyamide PA 6.
• To investigate the structural and optical properties of the resulting CdTe-CdS/PA 6 composite.
• To explore the kinetics of chalcogen and cadmium uptake on the PA 6 substrate.

Main Methods:

• Deposition of CdTe-CdS thin layers using a low-temperature, non-toxic SILAR (Successive Ionic Layer Adsorption and Reaction) method.
• Utilized monotelluropentathionic acid (H2TeS4O6) as a precursor for tellurium and sulfur.
• Characterization of structural and optical properties using UV-Vis spectroscopy, IR spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM).

Main Results:

• Successful formation of mixed CdTe-CdS thin layers on PA 6.
• Pseudo-second-order and Elovich kinetic models best described the uptake of chalcogens and cadmium.
• Optical bandgap energy of the layers ranged from 1.52 to 2.36 eV.
• SEM and AFM revealed uniformly distributed conical grains with an average diameter of approximately 30 nm.

Conclusions:

• The SILAR method provides an effective route for synthesizing CdTe-CdS thin films on PA 6.
• The optical and structural properties of PA 6 are significantly influenced by the deposited chalcogen and cadmium species.
• The observed grain morphology and optical bandgap suggest potential applications in optoelectronic devices.