[Structural, morphological and optical properties of PbI2 thick films]

Area of Science:

• Materials Science
• Solid State Physics

Context:

• Investigating the structural, morphological, and optical properties of lead iodide (PbI2) thick films.
• Utilizing the close-spaced sublimation technique for film preparation.
• Analyzing the influence of sublimation source temperature on film characteristics.

Purpose:

• To determine the optimal conditions for preparing high-quality PbI2 thick films.
• To understand the relationship between preparation parameters and material properties.
• To characterize the structural, morphological, and optical behavior of PbI2 films.

Summary:

• PbI2 thick films exhibited a polycrystalline hexagonal structure with (002) preferred orientation, influenced by source temperature.
• Scanning electron microscopy revealed layered hexagonal plate-like particles.
• Raman spectroscopy indicated shifts related to longitudinal optical (LO) modes and substrate interactions, with significant changes at higher temperatures.
• Photoluminescence studies at room temperature showed peaks associated with defects and exciton recombination.
• Optimal crystalline quality was achieved at a source temperature of 200°C, yielding films approximately 659 μm thick.

Impact:

• Provides insights into controlling the crystalline quality of PbI2 thick films.
• Establishes a correlation between sublimation temperature and film properties.
• Offers a foundation for optimizing PbI2 film deposition for potential optoelectronic applications.