Monolithic integration of perovskite heterojunction on TFT backplanes through vapor deposition for sensitive and stable x-ray imaging.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38669325.
- Also identified by DOI 10.1126/sciadv.adj8659 and PMC identifier 11051656.
- Licence recorded as CC BY-NC.
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Abstract
Metal halide perovskites exhibit substantial potential for advancing next-generation x-ray detection. However, fabricating high-performance pixelated imaging arrays remains challenging due to the substantial dark current density and stability issues associated with common organic-inorganic hybrid perovskites. Here, we develop a vapor deposition method to create the first all-inorganic perovskite heterojunction film. The heterojunction introduction effectively reduces the dark current density of detectors to about 0.8 nA·cm<sup>-2</sup>, satisfying thin-film transistor (TFT) integration standards, while also increases sensitivity to above 2.6 × 10<sup>4</sup> μC·Gy<sub>air</sub><sup>-1</sup>·cm<sup>-2</sup>, thus giving rise to a record low detection limit of <1 nGy<sub>air</sub>·s<sup>-1</sup> among all polycrystalline perovskite-based x-ray detectors. The devices also demonstrate remarkable stability across multifarious demanding working conditions. Last, through monolithic integration of the heterojunction film with a 64 × 64 pixelated TFT array, we have achieved high-resolution real-time x-ray imaging, which paves the way for the application of all-inorganic perovskite in low-dose flat-panel x-ray detection.