High-spatial-resolution X-ray imaging with directly integrated, melt-cast CsPbBr3 detectors

Vitalii Bartosh^a, Gebhard J. Matt^a, Kostiantyn Sakhatskyi^a, Andrii Kanak^a, Yuliia Kominko^a, Lorenzo J. A Ferraresi^b, Sergii Yakunin^a, Maksym V. Kovalenko^a

^aLaboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Switzerland; Laboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories for Materials Science and Technology, Switzerland

^bLaboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Switzerland; Laboratory for Transport at Nanoscale Interfaces, Empa – Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland

Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)

Kyoto, Japan, 2025 January 19th - 21st

Organizers: Atsushi Wakamiya and Hideo Ohkita

Oral, Vitalii Bartosh, presentation 033
Publication date: 4th October 2024

Currently, there is a significant need to increase the spatial resolution of medical X-ray imaging while maintaining high detection efficiency to provide high-quality images at low radiation doses [1]. This pushes research for the development of novel detector materials and architectures. Besides diverse state-of-the-art detector materials such as Si a-Se, and CdTe, recently, a novel class of semiconductors - metal halide perovskites - emerged as promising materials for radiography and computed tomography applications. However, existing studies lack persuasive examples of fully integrated perovskite detectors that would combine a high spatial resolution of multi-pixel detectors together with high detection efficiency (DE) [2], for which direct integration of single crystals on the readout substrates would be required. Here we show a method of fabricating high-quality, thick large-grain polycrystalline CsPbBr₃ films by melt growth directly on pixelated glass interposers. The obtained detector arrays show a remarkable 20 lp mm^-1 spatial resolution with a DE of 75.4% and low noise equivalent dose (NED) of ca. 28 photons for 22 keV X-rays under a low reverse bias voltage. The combination of these characteristics results in unprecedently, for charge-integrating mode, high values of 20% for detective quantum efficiency (DQE) at the Nyquist frequency. Single-pixel devices demonstrate single-photon counting performance for γ-radiation with an energy-resolved peak of ²⁴¹Am. Melt-grown CsPbBr₃ films, featuring a unique combination of detection efficiency, scalable fabrication, and cost-effectiveness, are promising for the development of high spatial resolution, low-dose X-ray imaging systems.

References:

[1] Sakhatskyi, K., Turedi, B., Matt, G.J. et al. Stable perovskite single-crystal X-ray imaging detectors with single-photon sensitivity. Nat. Photon. 17, 510–517 (2023)

[2] Sakhatskyi, K., Zhou, Y., Bartosh, V. et al. On characterizing X-ray detectors for low-dose imaging. arXiv:2407.20420 [physics.ins-det] preprint (2024)

Acknowledgements:

This work was financially supported by the Swiss Innovation Agency (Innosuisse) under grant agreement 46894.1 IP-ENG and by ETH Zürich through the ETH+ Project SynMatLab: Laboratory for Multiscale Materials Synthesis.

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