Jul 3 – 7, 2023
Facultat de Física
Europe/Madrid timezone

Stable perovskite single-crystal X-ray imaging detectors with single-photon sensitivity

Jul 3, 2023, 4:35 PM
1h 25m
Facultat de Física

Facultat de Física

Martí i Franqués, 1 08028 Barcelona
Contributed e-poster

Description

A major thrust of medical X-ray imaging is to minimize the X-ray dose acquired by the patient, down to single-photon sensitivity. Such characteristics have been demonstrated with only a few direct-detection semiconductor materials such as CdTe and Si; nonetheless, their industrial deployment in medical diagnostics is still impeded by elaborate and costly fabrication processes. Hybrid lead halide perovskites can be a viable alternative owing to their facile solution growth. However, hybrid perovskites are unstable under high-field biasing in X-ray detectors, owing to structural lability and mixed electronic–ionic conductivity. Here we show that both single-photon-counting and long-term stable performance of perovskite X-ray detectors are attained in the photovoltaic mode of operation at zero-voltage bias, employing thick and uniform methylammonium lead iodide single-crystal films (up to 300 µm) and solution directly grown on hole-transporting electrodes. The operational device stability exceeded one year. Detection efficiency of 88% and noise-equivalent dose of 90 pGyair are obtained with 18 keV X-rays, allowing single-photon-sensitive, low-dose and energy-resolved X-ray imaging.

Primary author

Co-authors

Anastasiia Sakhatska (ETH Zurich) Dr Bekir Turedi (ETH Zurich) Mr Erfu Wu (Empa) Dr Gebhard Matt (ETH Zurich) Dr Ivan Shorubalko (Empa) Prof. Maksym Kovalenko (ETH Zurich) Mr Muhammad Naufal Lintangradipto (KAUST) Prof. Omar Mohammed (KAUST) Prof. Osman Bakr (KAUST) Dr Rounak Naphade (KAUST) Dr Sergii Yakunin (ETH Zurich) Vitalii Bartosh (Department of Chemistry and Applied Biosciences, ETH Zurich)

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