X-ray-Induced Pyroelectric Effect in a Perovskite Ferroelectric Drives Low Detection Limit Self-Powered Responses
Yu Ma, Wenjing Li, Yi Liu, Wuqian Guo, Haojie Xu, Shiguo Han, Liwei Tang, Qingshun Fan, Junhua Luo, Zhihua Sun
Abstract
High Resolution Image Download MS PowerPoint Slide The light-induced pyroelectric effect (LPE) has shown a great promise in the application of optoelectronic devices, especially for self-powered detection and imaging. However, it is quite challenging and scarce to achieve LPE in the X-ray region. For the first time, we report X-ray LPE in a single-phase ferroelectric of (NPA) 2 (EA) 2 Pb 3 Br 10 ( 1, NPA = neopentylamine, EA = ethylamine), adopting a two-dimensional trilayered perovskite motif, which has a large spontaneous polarization of ∼3.7 μC/cm 2 . Its ferroelectricity allows for significant LPE in the wavelength range of ordinary visible light. Strikingly, the X-ray LPE is observed in 1, which endows remarkable self-powered X-ray responses at 0 bias, including sensitivity up to 225 μC Gy –1 cm –2 and a low detection limit of ∼83.4 nGy s –1, being almost 66 times lower than the requirement for medical diagnostics (∼5.5 μGy s –1 ). This work not only develops a new mode for X-ray detection but also provides valuable insights for future photoelectric device application.