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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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High-Performance Flat-Panel Perovskite X-ray Detectors Enabled by Defect Passivation in Ruddlesden-Popper

Xiaojuan Lu^1,2, Deyu Xin^1,2, Lin Lei³

¹Department of Materials Science, Sichuan University, Chengdu 610064, China.

ACS Applied Materials & Interfaces

|March 7, 2024

Summary

This study introduces a novel flat-panel X-ray detector using quasi-2D Ruddlesden-Popper perovskites, enhanced with DBPM additive. The detector shows high sensitivity, stability, and resolution, enabling low-dose X-ray imaging.

Keywords:

X-ray imaging defect engineering halide perovskites ion migration sensitivity

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Area of Science:

Materials Science
Solid-State Physics
Medical Imaging Technology

Background:

Halide perovskites offer strong X-ray absorption and optoelectronic properties, making them suitable for X-ray detection.
Developing sensitive, stable, and high-resolution flat-panel X-ray detectors is essential for practical applications.
Existing detectors often require higher X-ray doses, posing potential health risks.

Purpose of the Study:

To develop a novel flat-panel X-ray detector utilizing quasi-two-dimensional (2D) Ruddlesden-Popper (RP) perovskite.
To improve the stability and performance of perovskite X-ray detectors by passivating defects.
To achieve high-resolution X-ray imaging with significantly reduced radiation dose.

Main Methods:

Integration of quasi-2D RP perovskite with a pixeled thin-film transistor (TFT) backplane.
Incorporation of 2,5-dibromopyrimidine (DBPM) as an additive to passivate Lewis acid defects.
Characterization of the perovskite material and the fabricated X-ray detector's performance metrics (sensitivity, detection limit, spatial resolution, stability).

Main Results:

DBPM additive suppressed ion migration, improved optoelectronic performance, and enhanced operational stability.
Activation energy of RP perovskite increased from 0.96 to 1.35 eV with DBPM.
Achieved high sensitivity (∼13,600 μC Gy_air^-1 cm^-2), low detection limit (6.56 nGy_air s^-1), high spatial resolution (3.7 lp/mm), and excellent imaging at low dose (∼50 μGy_air).

Conclusions:

The novel DBPM-modified quasi-2D RP perovskite detector demonstrates superior performance and stability.
The developed detector enables high-quality X-ray imaging at half the typical clinical dose.
This advancement opens new possibilities for developing advanced flat-panel perovskite X-ray detectors for various applications.