Quasi-One-Dimensional Perovskite Single Crystals Enabling Decoupled Ionic-Electronic Transport for Sensitive and...

Area of Science:

• Materials Science
• Solid-State Physics
• Detector Technology

Background:

• Metal halide perovskites show promise for X-ray detection but face challenges with carrier collection and ion migration.
• Existing materials exhibit an intrinsic trade-off, limiting performance for high-energy X-ray detection.

Purpose of the Study:

• To develop a novel perovskite material that simultaneously achieves efficient carrier collection and suppressed ion migration for enhanced X-ray detection.
• To investigate the structural and electronic properties of quasi-one-dimensional perovskites for X-ray sensing applications.

Main Methods:

• Synthesized quasi-one-dimensional cystamine lead iodide perovskite single crystals.
• Characterized carrier mobility-lifetime product and ion migration activation energy.
• Fabricated and tested X-ray detector devices based on the synthesized perovskites.
• Integrated the perovskite detector with a thin-film transistor backplane for imaging.

Main Results:

• Achieved a high mobility-lifetime product of 4.35 × 10⁻⁴ cm² V⁻¹.
• Demonstrated a high activation energy for ion migration (0.94 eV), indicating suppressed ion movement.
• Obtained an impressive X-ray sensitivity of 1.42 × 10⁵ µC Gy⁻¹ cm⁻².
• Showcased excellent operational stability under continuous radiation, high electric fields, and high temperatures.
• Successfully integrated the perovskite with a thin-film transistor for X-ray imaging.

Conclusions:

• Quasi-one-dimensional perovskites decouple electronic and ionic transport, overcoming limitations of traditional perovskite X-ray detectors.
• The demonstrated material offers a pathway to highly sensitive, stable, and low-cost X-ray detection and imaging solutions.