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，卤化铅钙钛矿单晶显着提高了辐射探测器的性能。然而，高铅 (Pb) 含量超出了许多司法管辖区（包括美国和英国）设定的最大限制，并且这些材料中的易离子电导率限制了可应用的电场范围，从而限制了其运行稳定性。该提案将解决当前 X 射线探测器的挑战，包括有毒元素的使用、有限的性能、高制造成本和有限的载流子传输。我们的初步结果表明，BiOI 可以成为下一代辐射探测器中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，这些 X 射线剂量率来自于其成分重元素、大迁移率寿命积和高电阻率。为了将该技术转移到工业领域并对医学成像和核安全产生影响，我们将进一步 1) 通过以下方式将移动寿命产品提高到远高于 6 +/- 2 x 10^-2 cm2 V-1 s-1成分工程，2）在不影响性能的情况下将探测器的尺寸增加一个数量级（目前为 5 毫米），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）联合研究的总体目标是开发新一代具有成本效益、稳定且规模化的铋基辐射探测器。检测到比当前商业标准低三个数量级的剂量率。