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

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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.