Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.053
Publication date: 16th December 2024
Pnictogen-based semiconductors have gained increasing attention as potential nontoxic alternatives to lead-halide perovskites [1]. This is because of their ability to replicate key features of the electronic structure of lead-halide perovskites, which is believed to be conducive towards achieving defect tolerance, whilst overcoming the toxicity and stability limitations. This talk discusses one such material, BiOI, for applications in X-ray detection.
The composition of heavy elements Bi and I leads to stronger X-ray attenuation than commercial Cd-Zn-Te and amorphous-Se, as well as lead-halide perovskites. We show that the high stopping power, as well as its large mobility lifetime products and low dark currents enable these devices to have a limit of detection >250x improved over commercial amorphous-Se and Cd-Zn-Te detectors. This can improve the safety of medical imaging, and we examine the fundamental reasons behind the properties of BiOI enabling this strong performance [2]. Finally, we discuss the key challenges to bring this technology to market [3].
R. L. Z. H. acknowledges funding from EPSRC (no. EP/Y032942/1) through the ECCS-EPSRC collaborative programme.
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