Semiconductive Coordination Polymer with Multi-Channel Charge Transfer for High-Performance Direct X-ray Detection

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Coordination polymers (CPs) offer designability and stability for X-ray detection.
• Achieving high sensitivity and low detection limits simultaneously in CPs remains a challenge.

Purpose of the Study:

• To construct a novel conjugated CP for enhanced X-ray detection performance.
• To optimize charge transfer mechanisms for improved carrier dynamics.

Main Methods:

• Synthesis of a new conjugated CP: {[Co(BPTTz)(DIPA)]·DMA}n.
• Investigation of multi-channel charge transfer by regulating linker-mediated electronic states.
• Fabrication and characterization of the CP-based semiconductor detector.

Main Results:

• The CP exhibits a high mobility-lifetime product (μτ) of 8.05×10⁻³ cm² V⁻¹.
• Achieved the lowest detectable X-ray dose rate (128 nGyair S⁻¹) and high sensitivity (172 μC Gyair⁻¹ cm⁻²) for CP-based detectors.
• Demonstrated excellent long-time air stability (>3 months) and operational stability.

Conclusions:

• The rational structural design enhances photoelectronic efficiency and stability of semiconductive CPs.
• This work provides a promising strategy for developing high-performance direct X-ray detectors.
• The developed CP-based detector sets new benchmarks for sensitivity and detection limits.