Semeniuk O, Grynko O, Juska G, Reznik A
Chemistry and materials science program, Lakehead University, 955 Oliver Road, Thunder Bay, ON, P7B 5E1, Canada.
Advanced detection devices department, Thunder Bay Regional Health Research Institute, 290 Munro Street, Thunder Bay, ON, P7A 7T1, Canada.
Sci Rep. 2017 Oct 16;7(1):13272. doi: 10.1038/s41598-017-13697-2.
Presence of a signal lag is a bottle neck of performance for many non-crystalline materials, considered for dynamic radiation sensing. Due to inadequate lag-related temporal performance, polycrystalline layers of CdZnTe, PbI, HgI and PbO are not practically utilized, despite their superior X-ray sensitivity and low production cost (even for large area detectors). In the current manuscript, we show that a technological step to replace nonhomogeneous disorder in polycrystalline PbO with homogeneous amorphous PbO structure suppresses signal lag and improves time response to X-ray irradiation. In addition, the newly developed amorphous lead oxide (a-PbO) possesses superior X-ray sensitivity in terms of electron-hole pair creation energy [Formula: see text] in comparison with amorphous selenium - currently the only photoconductor used as an X-ray-to-charge transducer in the state-of-the-art direct conversion X-ray medical imaging systems. The proposed advances of the deposition process are low cost, easy to implement and with certain customization might potentially be applied to other materials, thus paving the way to their wide-range commercial use.
对于许多考虑用于动态辐射传感的非晶材料而言，信号延迟的存在是性能瓶颈。由于与延迟相关的时间性能不足，尽管CdZnTe、PbI、HgI和PbO的多晶层具有出色的X射线灵敏度和较低的生产成本（即使对于大面积探测器也是如此），但实际上并未得到应用。在本手稿中，我们表明用均匀的非晶PbO结构取代多晶PbO中的非均匀无序的技术步骤可抑制信号延迟并改善对X射线照射的时间响应。此外，新开发的非晶氧化铅（a-PbO）与非晶硒相比，在电子-空穴对产生能量[公式：见正文]方面具有出色的X射线灵敏度，非晶硒是目前在最先进的直接转换X射线医学成像系统中用作X射线到电荷转换器的唯一光电导体。所提出的沉积工艺的优点是成本低、易于实施，并且经过一定的定制可能会应用于其他材料，从而为其广泛的商业应用铺平道路。
