2D Multilayered Perovskite Ferroelectric with Halogen Bond Induced Interlayer Locking Structure toward Efficient...

Area of Science:

• Materials Science
• Solid-State Physics
• Crystallography

Background:

• 2D Ruddlesden-Popper (RP) hybrid perovskite ferroelectrics show promise for direct X-ray detection.
• Weak interlayer interactions in RP perovskites lead to instability in X-ray detectors.
• Enhancing interlayer interactions is crucial for stable RP perovskite ferroelectric X-ray detectors.

Purpose of the Study:

• To enhance interlayer interactions in 2D RP perovskite ferroelectrics using halogen bonding.
• To develop a stable and efficient X-ray detector based on a novel layered perovskite material.
• To investigate the impact of halogen bonding on the structural and ferroelectric properties of RP perovskites.

Main Methods:

• Synthesis of a 2D trilayered ferroelectric material, (BrPA)2(EA)2Pb3Br10 (BEPB), utilizing halogen bonding.
• Characterization of structural stability through analysis of Br···Br halogen bonds and C─H···Br hydrogen bonds.
• Evaluation of ferroelectric properties via P-E hysteresis loops.
• Fabrication and testing of a BEPB-based X-ray detector to assess sensitivity and stability.

Main Results:

• The synthesized BEPB material exhibits strong Br···Br halogen bonds and C─H···Br hydrogen bonds, enhancing structural stability and suppressing ion migration.
• Ferroelectric properties were confirmed with a large polarization of approximately 7.3 µC cm⁻².
• The BEPB-based X-ray detector achieved high sensitivity (562.6 µC Gy⁻¹ cm⁻²) at 0 V bias.
• The detector demonstrated low baseline drift and exceptional environmental stability.

Conclusions:

• Halogen bonding is an effective strategy to strengthen interlayer interactions in 2D RP perovskite ferroelectrics.
• The novel BEPB material offers enhanced structural stability and ferroelectric properties for X-ray detection.
• This work presents an unprecedented approach to achieving stable and efficient X-ray detection using halogen bond-strengthened 2D layered ferroelectrics, paving the way for practical optoelectronic devices.