Slot-die coating of lead halide perovskites: toward x-ray image detectors

该项目代表了生产新型平板X射线图像探测器(用于乳腺癌的乳房X光检查)的第一步，该探测器具有更高的灵敏度，成本也大大降低。这将通过用卤化铅钙钛矿取代目前在这些器件中使用的半导体(掺砷非晶态硒)来实现。由于高吸收截面、高载流子迁移率和溶液可加工性的独特组合，这一系列钙钛矿材料对太阳能研究产生了革命性的影响。我们的目标是在X射线图像探测器领域产生类似的影响。由于这些材料可以使用基于溶液的方法沉积，既成本低，能源效率高，而且高度可扩展，预计制造成本和能量投入将大幅降低。此外，这些铅基材料的高X射线吸收截面应该会导致探测器灵敏度的提高。工业合作伙伴(Analogic Canada)希望开发用于X射线图像探测器的钙钛矿型光导体，但缺乏大规模沉积这种材料相对较厚的薄膜的技术和诀窍。该项目旨在填补这一知识空白；我们将开发适合大规模沉积卤化铅钙钛矿的工艺条件。

This project represents a first step toward the production of new flat panel X-ray image detectors (used inmammographic screening for breast cancer) with increased sensitivity at a substantially reduced cost. This willbe achieved by replacing the semiconductor currently used in these devices (arsenic-doped amorphousselenium) with lead halide perovskites. This family of perovskite materials has had a transformative impact onsolar energy research, owing to a unique combination of high absorption cross-section, high charge carriermobility, and solution processability. We aim to have a similar impact on the field of X-ray image detectors.Since these materials can be deposited using solution-based approaches that are both cost- and energy-efficient,as well as highly scalable, large reductions in manufacturing costs and energy inputs are expected.Additionally, the high X-ray absorption cross-section of these lead-based materials should lead toimprovements in detector sensitivity. The industrial partner (Analogic Canada) would like to developperovskite photoconductors for X-ray image detectors, but lacks the technology and know-how to depositrelatively thick films of this material at scale. This project aims to fill that knowledge gap; we will developprocessing conditions suitable for the large-scale deposition of lead halide perovskites.