ECCS-EPSRC: A new generation of cost-effective, scalable and stable radiation detectors with ultrahigh detectivity

ECCS-EPSRC：具有超高探测率的新一代经济高效、可扩展且稳定的辐射探测器

• 批准号: EP/Y032942/1
• 负责人: Robert L. Z. Hoye
• 金额: $ 97.63万
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY032942%2F1
• 关键词: ECCS; EPSRC; new; generation; cost

Significantly improved performance of radiation detectors has recently been achieved with lead-halide perovskite single crystals. However, the high lead (Pb) content exceeds the maximum limit set in many jurisdictions (including in the US and UK), and the facile ionic conductivity in these materials limits the range of electric fields that can be applied, thus limiting their operational stability. This proposal will address the challenges of current X-ray detectors, including the use of toxic elements, limited performance, high manufacturing costs, and limited charge-carrier transport. Our preliminary results have shown that BiOI can be the ideal non-toxic alternative to the Pb-based perovskites for next generation radiation detectors because of its high sensitivity and the ability to detect ultralow does rates of X-rays, which arise from its composition of heavy elements, large mobility-lifetime products, and high resistivities. To transfer this technology to industry and to have an impact on medical imaging and nuclear security, we will further 1) improve the mobility-lifetime product to well above 6 +/- 2 x 10^-2 cm2 V-1 s-1 through compositional engineering, 2) increase the size of the detectors by an order of magnitude (from 5 mm currently) without compromising on performance, and 3) optimize the device architecture and imaging performance. The overall aim of this joint research between US team (University at Buffalo) and the UK team (University of Oxford and University of Cambridge) is to develop a new generation of cost-effective, stable and up-scaled bismuth-based radiation detectors capable of detecting three orders of magnitude lower dose rates than the current commercial standard.

最近，用卤化铅钙钛矿单晶实现了辐射探测器的显著改进的性能。然而，高铅（Pb）含量超过了许多司法管辖区（包括美国和英国）设定的最大限值，并且这些材料中的易离子导电性限制了可以应用的电场范围，从而限制了其操作稳定性。该提案将解决当前X射线探测器面临的挑战，包括使用有毒元素、性能有限、制造成本高和电荷载流子传输有限。我们的初步研究结果表明，BiOI可以成为下一代辐射探测器的铅基钙钛矿的理想无毒替代品，因为它具有高灵敏度和检测超低剂量率X射线的能力，这是由于它的重元素组成，大迁移率寿命产品和高电导率。为了将这项技术应用于工业，并对医学成像和核安全产生影响，我们将进一步：1）通过成分工程将迁移率-寿命乘积提高到远高于6 +/- 2 x 10^-2 cm 2 V-1 s-1，2）将探测器的尺寸增加一个数量级（目前为5 mm）而不影响性能，以及3）优化设备架构和成像性能。美国团队（布法罗大学）和英国团队（牛津大学和剑桥大学）之间的这项联合研究的总体目标是开发新一代具有成本效益、稳定和升级的铋基辐射探测器，能够探测比当前商业标准低三个数量级的剂量率。