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Article Abstract
Self-driven X-ray detectors, featuring low energy consumption, compactness, and integrability, are essential in diverse applications including medical imaging, security, and industrial inspection. Unlike the conventional photovoltaic based on Schottky and p-n junctions, the bulk photovoltaic effect (BPVE) enables photoexcited carrier separation in homogeneous polar single crystals, providing a promising mechanism for self-driven X-ray detection. In this study, we present a polar selenide single crystal LiGaInSe (LGISe) as a BPVE-driven material for self-driven X-ray detection. Large-sized, high-quality LGISe crystals were successfully grown using the Bridgman growth technique. Photoelectric experiments reveal that the polarization-induced BPVE along the polar -axis in LGISe facilitates the separation of photoexcited carriers without an external electric field. Leveraging this mechanism, we fabricated LGISe-based self-driven X-ray detectors, achieving a high sensitivity of 354 μC Gy cm and a low detection limit of 125.5 nGy s at zero bias, displaying a clear imaging at a dose rate of 2.944 μGy s. This study highlights the significant potential of LGISe crystals for self-driven X-ray detection and establishes a novel platform for polar selenide materials in next-generation radiation detection technologies.
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