Multienergy x-ray detection and imaging enabled by working voltage regulating unipolar carrier collection in perovskite detectors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40700507.
- Also identified by DOI 10.1126/sciadv.ads2995 and PMC identifier 13155489.
- Licence recorded as CC BY-NC.
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Abstract
Multienergy x-ray imaging can provide additional substance information beyond morphology in conventional energy-integration imaging. The predominant approach, single photon counting, sets stringent requirements on low x-ray flux and signal discrimination and prolongs imaging time. Here, we report on the design of unipolar n-i-n perovskite detectors for multienergy x-ray imaging. Systematic characterization validates electrons dominating carrier dynamics in detectors, and the distribution of generated electrons varies as x-ray energy along its penetrating direction, whereas working voltage can manipulate electron drift length, ensuring their selective collection for x-ray energy discrimination. Our multienergy imaging array adopts high-flux x-ray in a normal imaging system and realizes fast 4-energy-bins x-ray images. By introducing the σ(<i>E<sub>i</sub></i>)/σ(<i>E<sub>j</sub></i>)-related multienergy digital subtraction algorithm, the images successfully distinguish the substance of targets side by side or by stacking, representing a notable advancement over conventional energy-integration imaging technique.