Quasi-2D Perovskite Crystalline Layers for Printable Direct Conversion X-Ray Imaging

Area of Science:

• Materials Science
• Detector Physics
• Nanotechnology

Background:

• Polycrystalline perovskite films offer potential for printable large-scale X-ray imagers.
• Fabricating thick, high-quality perovskite layers without defects or solvent residue is a significant challenge.

Purpose of the Study:

• To develop a solution-based method for producing high-quality quasi-2D perovskite crystalline layers.
• To fabricate and characterize perovskite X-ray detectors with enhanced performance for imaging applications.

Main Methods:

• A solution method involving n-butylamine iodide addition to methylammonium lead iodide precursor.
• Coating at elevated temperatures to achieve uniform, crystalline layers on various substrates.
• Fabrication of photodiodes and testing under dark and X-ray irradiation conditions.

Main Results:

• Obtained compact, uniform, and crystalline quasi-2D perovskite layers.
• Demonstrated photodiodes with low dark current and stable operation (96h dark, 15h X-ray).
• Achieved high X-ray sensitivity (1214 µC Gy_air^-1 cm^-2) with sensitivity gain at higher fields and resolved 80-200 µm features.

Conclusions:

• The developed solution method enables high-quality printable perovskite layers for X-ray detection.
• The quasi-2D perovskite detectors show promising performance for direct conversion X-ray imaging.
• This work advances the development of cost-effective, large-scale printable X-ray imagers.