Photocurrent Enhancement by Copper Incorporation in Chemical-Solution-Synthesized Inorganic Lead Perovskite Thin...

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Physics

Background:

• Perovskite thin films are crucial for advanced photovoltaic technologies due to their excellent optoelectronic characteristics.
• Developing cost-effective and scalable synthesis methods is essential for the commercialization of perovskite solar cells.

Purpose of the Study:

• To develop a low-cost, reproducible, and scalable method for synthesizing all-inorganic CsPbI1.5Br1.5 perovskite thin films.
• To investigate the effect of incorporating copper (Cu2+) and chloride (Cl-) ions on the properties and performance of these perovskite thin films.
• To fabricate and evaluate photodetectors based on the synthesized perovskite films.

Main Methods:

• Chemical bath deposition of PbS followed by gas-solid iodination to form PbI2.
• Dip-coating to incorporate Cs+, Cu2+, Br-, and Cl- ions into PbI2.
• Annealing at 270 °C to produce perovskite thin films.
• Characterization using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and photoluminescence.

Main Results:

• A scalable synthesis method yielding perovskite thin films with large coverage and uniform thickness was established.
• Characterization confirmed the structural, chemical, and optical properties of the synthesized CsPbI1.5Br1.5 and (Cs0.95:Cu0.01)PbI1.5Br1.3Cl0.1 films.
• Photodetectors fabricated with (Cs0.95:Cu0.01)PbI1.5Br1.3Cl0.1 films showed significantly enhanced performance, particularly in photocurrent.

Conclusions:

• The study successfully demonstrated a low-cost synthesis of perovskite thin films.
• The incorporation of Cu2+ and Cl- ions plays a pivotal role in enhancing the performance of perovskite-based optoelectronic devices.
• The developed methodology offers a promising route for producing high-performance perovskite thin films for photodetector applications.