Polycrystalline Perovskite Pellets for Stable X‐Ray Detectors

  • Author: ChemistryViews.org
  • Published: 27 June 2020
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Advanced Materials/Wiley-VCH
thumbnail image: Polycrystalline Perovskite Pellets for Stable X‐Ray Detectors

X‐ray detectors are widely used, e.g., in medical diagnostics or for product inspection. Halide perovskites are promising as materials for direct X‐ray detection. In direct X-ray detection, a semiconductor material converts X-ray photons to an electrical charge, and thus, directly into a digital signal. However, obtaining high-quality perovskite crystals with large sizes and long-term stability that can be used in detectors is challenging.


Xiaojia Zheng, Wen‐Hua Zhang, Sichuan Research Center of New Materials, China Academy of Engineering Physics, Chengdu, Jianguo Zhu, Sichuan University, Chengdu, China, and colleagues have prepared methylammonium bismuth iodide (MA3Bi2I9) polycrystalline pellets (PPs, pictured above on the right) to be used in direct X‐ray detectors. The team used MA3Bi2I9 powders (pictured above on the left) as the raw materials. The powders were compacted under a pressure of 0.2 GPa using a cold isostatic press method. The size and shape of the resulting pellets can be easily tuned by using different molds.


The team then assembled X‐ray detectors with the configuration Au/MA3Bi2I9‐PPs/Au and evaluated the system's X‐ray detection performance. The devices showed a low limit of detection, high detection efficiency, high sensitivity, and good ambient and thermal stability. Based on these properties, as well as their nontoxicity and simple fabrication, the team considers MA3Bi2I9‐PPs detectors good candidates for next-generation X-ray detectors.


 

 

Article Views: 392

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH