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X-ray Imaging

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

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Published on: February 27, 2017

High-Performance Perovskite Flat Panel X-Ray Imagers via Blade Coating.

Aiping Zhang^1,2, Shujie Tie¹, Xiaojuan Lu¹

¹Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu, 610200, China.

|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.

Keywords:

X‐ray detection blade‐coating low noise perovskite

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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 Gy_air ^-1 cm^-2), low limit of detection (26.8 nGy_air 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.