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Determination of Crystal Structures

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

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Phase-engineering compact and flexible CsPbBr₃ microcrystal films for robust X-ray detection.

Lotte Clinckemalie¹, Bapi Pradhan¹, Roel Vanden Brande¹

¹Department of Chemistry, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium elke.debroye@kuleuven.be bapi.pradhan@kuleuven.be.

Journal of Materials Chemistry. C

|January 8, 2024

Summary

Researchers developed a new method for creating stable, thick perovskite films for X-ray detectors. Introducing a second phase improved device stability and performance, paving the way for better medical imaging technology.

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Published on: May 29, 2018

Area of Science:

Materials Science
Solid-State Physics
Photonics

Background:

All-inorganic cesium lead halide perovskites (CsPbBr3) show promise for direct X-ray detection.
Challenges exist in fabricating stable, pinhole-free thick films for high-resolution devices.

Purpose of the Study:

To develop a facile strategy for creating stable, compact, thick perovskite films under ambient conditions.
To investigate the impact of introducing a 2D CsPb2Br5 phase into CsPbBr3 on photophysical properties and charge transport for X-ray detection.

Main Methods:

Fabrication of flexible, compact thick films using a non-conductive polymer under ambient conditions.
Introduction of the 2D CsPb2Br5 phase into CsPbBr3 perovskite crystals.
Characterization of photophysical properties and charge transport.
Rietveld refinement to analyze structural changes.

Main Results:

The dual-phase perovskite films exhibited improved stability and higher voltage operation under X-ray exposure.
Introduction of the 2D phase induced local distortions and Pb-vacancies in the CsPbBr3 lattice.
These structural changes increased the ion migration energy barrier, leading to very low dark current and enhanced stability.
Potential for improved local charge extraction and X-ray image resolution.

Conclusions:

A novel strategy using a non-conductive polymer enables the fabrication of stable, flexible, thick perovskite films.
Incorporating a secondary phase (CsPb2Br5) into CsPbBr3 enhances device stability and performance for X-ray detection.
The findings suggest that phase engineering in perovskites is a viable approach for efficient photon-to-charge conversion in medical imaging applications.