Vertically Oriented Quasi-2D Perovskite Grown In-Situ by Carbonyl Array-Synergized Crystallization for Direct X-Ray...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanoscience

Background:

• Quasi-2D perovskite quantum wells show promise for direct X-ray detection.
• Fabricating uniform, oriented perovskite films is challenging due to crystallization issues.

Purpose of the Study:

• To develop a strategy for fabricating high-quality, thick quasi-2D perovskite films for X-ray detection.
• To improve the performance of perovskite-based X-ray detectors.

Main Methods:

• Employed a carbonyl array-synergized crystallization (CSC) strategy using PEA2MA4Pb5I16 perovskite precursor.
• Incorporated carbonyls to generate intermediates, reduce nucleation, enhance binding energies, and passivate defects.
• Fabricated thick films with vertical orientation and uniform well-width distribution.

Main Results:

• Achieved high-quality, vertically oriented PEA2MA4Pb5I16 perovskite films with controlled well width.
• The CSC strategy effectively reduced gas-liquid interface nucleation and passivated ion defects.
• Developed X-ray detectors with superior performance compared to existing technologies.

Conclusions:

• The CSC strategy is a viable method for producing high-quality quasi-2D perovskite films.
• This approach enhances the potential of 2D perovskites for next-generation X-ray detection systems.
• Perovskite quantum wells offer a promising alternative for large-area flat-panel X-ray detectors.