Synthesis and characterization of PbI2/PVA composite polymer films for optoelectronic applications
DOI:
https://doi.org/10.18633/biotecnia.v26.2441Keywords:
Lead iodide, composite films, Chemical precipitation, Polyvinyl alcohol, optoelectronicAbstract
Polyvinyl alcohol/lead iodide (PVA/PbI2) composite films were synthesized with varying concentrations of PbI2 using a low-temperature, cost-effective solvent evaporation process. The structural properties of the synthesized particles were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results revealed a predominantly crystalline nature, displaying reflection planes characteristic of the 2H polytype of lead iodide. SEM micrographs showed a hexagonal morphology with an average particle size of 13.2 µm. The optical properties of the composite films were measured using UV-Vis spectroscopy, indicating that the indirect energy band gap for pure PVA is 4.65 eV. In contrast, PVA/PbI2 films with 0.5, 1.0, 1.5, and 2.0 wt% PbI2 exhibited a direct transition of 5.16 eV and an indirect transition of 4.45 eV. The electrical resistance of the PVA film was measured at 4.318 × 107 Ω. Chemical analysis using Fourier-transform infrared (FTIR) spectroscopy showed that the addition of PbI2 particles did not alter the characteristic bands of PVA, suggesting no chemical bonding between the particles and the polymer matrix. The optical and electrical properties suggest that the PVA/PbI2 composite films are promising for various optoelectronic applications.
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