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journal article·2025-12-12Open access

Single-Step Synthesis of Cs 3 Bi 2 I 9 Nanocrystals for Scalable Direct X-ray Detectors

Ramavath Babu, Joydip Ghosh, Nadine J. Schrenker, Kavya Reddy Dudipala, Yi-Teng Huang, Yixin Wang, Shiling Dong, Deepika Gaur, Sara Bals, Sergio Gómez-Graña, Xian Wei Chua, Isabel H. B. Braddock, Matthew. C. Veale, Matthew. D. Wilson, Jack Matthew Woolley, Akshay Rao, Robert L. Z. Hoye, Lakshminarayana Polavarapu

ACS Energy Letters· Volume 10· Issue 12
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Abstract

High Resolution Image Download MS PowerPoint Slide Lead-free perovskite-inspired materials have emerged as promising candidates for direct X-ray detection. However, in the early exploration of emerging materials, the focus was on large single crystals. Herein, we report a facile, scalable, single-step synthesis of high-quality Cs 3 Bi 2 I 9 nanocrystals (NCs) directly from their precursor powders through an ultrasonication approach. The large-scale synthesis of the NCs allowed for the production of 0.78 cm 2 pellets used in the fabrication of X-ray detection devices, which exhibit a high bulk resistivity of 1 × 10 11 Ω cm and a low dark current density of 3.3 nA cm –2 under an applied bias of 50 V (357 V cm –1 electric field). These devices achieve a limit detection of 108 nGy air s –1, an order of magnitude improvement over the a-Se used in commercial medical imaging, along with stable current under continuous X-ray exposure with a peak energy of 35 keV p . Finally, we demonstrate the scale-up of these detectors by producing thick films 9 cm 2 in area, achieving a performance comparable to that of the detectors based on pellets.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Advanced Semiconductor Detectors and Materials · Digital Radiography and Breast Imaging

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry

Campus Universitario Lagoas Marcosende

Inorganic Chemistry Laboratory

University of Oxford

Electron Microscopy for Materials Science (EMAT) and NanoLight Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium

Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom

Cavendish Laboratory, University of Cambridge, JJ Thomson Ave, Cambridge CB3 0HE, United Kingdom

UKRI Science & Technology Facilities Council

Rutherford Appleton Laboratory

Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom

Funding

Engineering and Physical Sciences Research Council · Royal Academy of Engineering · Ministerio de Ciencia, Innovaci?n y Universidades · HORIZON EUROPE European Innovation Council · Agency for Science, Technology and Research · Science and Technology Facilities Council · Fonds Wetenschappelijk Onderzoek · Xunta de Galicia · Division of Electrical, Communications and Cyber Systems · NextGenerationEU · 5N Plus

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