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High-Performance Perovskite Flat Panel X-Ray Imagers via Blade Coating.
Aiping Zhang1,2, Shujie Tie1, Xiaojuan Lu1
1Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu, 610200, China.
Small Methods
|December 10, 2024
Summary
Researchers developed a new blade-coating method for fabricating large, uniform perovskite X-ray detector films. This breakthrough enables high-performance flat-panel X-ray imagers for low-dose applications.
Area of Science:
- Materials Science
- Medical Imaging
- Detector Physics
Background:
- Perovskite X-ray detectors offer superior performance for low-dose imaging.
- Fabricating large-area, uniform, and stable perovskite films for flat-panel X-ray imagers (FPXIs) remains a significant challenge.
- A scalable synthesis route is crucial for commercializing perovskite X-ray detector technology.
Purpose of the Study:
- To develop a general synthesis route for large-scale halide perovskite thick films on thin-film transistor (TFT) backplanes.
- To enable high-throughput manufacturing of uniform and stable perovskite films for FPXIs.
- To bridge the gap between perovskite detector potential and market entry.
Main Methods:
- Development of an advanced precursor paste optimized for blade coating.
- Direct deposition of 300-micrometer thick perovskite films onto pixeled TFT substrates using blade coating.
- Characterization of film uniformity, dark current, noise, sensitivity, limit of detection, and spatial resolution.
Main Results:
- Achieved highly uniform 300-micrometer thick perovskite films via blade coating.
- Demonstrated stable dark current and minimal noise in the fabricated X-ray detectors.
- Attained high sensitivity (15200 µC Gyair -1 cm-2), low limit of detection (26.8 nGyair s-1), and excellent spatial resolution (0.95 lp mm-1) with negligible crosstalk.
Conclusions:
- The developed blade-coating method provides a high-throughput manufacturing solution for large-area perovskite X-ray detector films.
- The fabricated (BA)2(MA)9Pb10I31 perovskite FPXIs exhibit promising performance for advanced X-ray imaging.
- This work facilitates the market entry of perovskite-based low-dose X-ray detectors.
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