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Super internal electrostatic field effect on self-powered X-ray detector in ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystal
Fuai Hu, Yanru Yin*, Yang Li, Feifei Guo, Jianhui Liu, and Zeliang Gao*
https://doi.org/10.1016/j.cjsc.2025.100863
ABSTRACT
Self-powered X-ray detectors that combine high sensitivity with low detection limits have emerged as a critical focus in radiation detection research. This work pioneers the application of lead magnesium niobate-lead titanate (PMN-PT) single crystal, renowned for its piezoelectric properties, as a material in self-powered X-ray detectors. Due to its super internal electrostatic field, the PMN-PT single crystal self-powered detector exhibits a sensitivity of 346 μC Gyair-1 cm-2 and a detection limit of 0.43 nGyair s-1 under 40 keV X-rays, which is 17 times and 0.008% as those of the commercial α-Se detector, respectively. Notably, the detector maintains a high sensitivity of 157 μC Gyair-1 cm-2 even under hard 120 keV, surpassing the performance of most reported perovskite self-powered detectors. Furthermore, the detector exhibits a significantly reduced baseline drift (∼1.0 pA) and excellent operational stability in self-powered mode. This study conclusively demonstrates that polar piezoelectric crystals, which incorporate heavy metal elements, are highly promising candidates for developing high-performance self-powered X-ray detectors.
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