Oriented Alignment of CsPbBr₃ Single-Crystal Arrays for Flexible X-ray Imaging

Area of Science:

• Materials Science
• Optoelectronics
• Crystallography

Background:

• Perovskite materials are increasingly used in flexible optoelectronics.
• X-ray detection is a key application area for these materials.

Purpose of the Study:

• To develop oriented cesium lead bromide (CsPbBr3) single-crystal arrays on flexible substrates for X-ray detection.
• To investigate the control over crystal morphology and detector performance.

Main Methods:

• Oriented alignment of CsPbBr3 single-crystal arrays on polydimethylsiloxane (PDMS) substrates via controlled crystallization in precursor droplets.
• Fabrication of flexible X-ray detector arrays by integrating CsPbBr3 microcuboids with electrode arrays.
• Surface passivation for enhanced detector performance.

Main Results:

• Achieved well-oriented CsPbBr3 microcuboid alignment through spontaneous rotation.
• Demonstrated precise control over microcuboid morphology by adjusting growth temperature.
• Obtained high sensitivity (1.97 × 10^5 μC·Gyair^-1·cm^-2) and low detection limit (89 nGyair·s^-1).
• Showcased excellent mechanical properties, high pixel uniformity, and conformal X-ray imaging capabilities on curved surfaces.

Conclusions:

• The developed flexible CsPbBr3 X-ray detectors exhibit superior performance for optoelectronic applications.
• The controlled crystallization method enables precise tuning of material properties for advanced imaging.
• This technology holds promise for conformal X-ray imaging and flexible electronic devices.