Abstract
Hyperspectral imaging (HSI) with rich spectral and spatial information holds potential for applications ranging from remote sensing to biomedicine. However, charge-coupled device (CCD) detectors used in conventional HSI systems suffer from inferior and unbalanced responsivity in the visible region, which is not a perfect choice for high-performance visible HSI. That is, conventional Si-based CCDs exhibit poor responsivity at short wavelengths (e.g., 400–600 nm) compared with that at longer wavelengths due to the nature of the indirect bandgap in silicon of around 1.1 eV. To solve this challenge, we introduce a CsPbBr 3 perovskite layer to shape the spectrum of a Si/PEDOT:PSS heterojunction photodetector (PD), resulting in a fabricated Si- CsPbBr 3 hybrid PD with enhanced responsivity at 400–600 nm. This results in an approximately flat spectral responsivity curve in the visible region (400–800 nm). Therefore, the stable Si − CsPbBr 3 hybrid PD with a flat spectrum overcomes the shortcomings of traditional Si-based PDs and makes it more suitable for HSI. Further, we set up a first perovskite HSI system with high spectrum resolution and demonstrate potential applications for tumor detection and tissue identification. We believe that this perovskite optimization can be integrated into modern CCD, thus becoming a step in future CCD fabrication processes, which is a milestone for high-performance HSI systems.
Highlights
Hyperspectral imaging (HSI), a promising technique combining spectral and spatial information, has been exploited for applications ranging from remote sensing [1] to biomedicine [2,3]
We believe that this perovskite optimization can be integrated into modern charge-coupled device (CCD), becoming a step in future CCD fabrication processes, which is a milestone for high-performance HSI systems
The CsPbBr3 thin films were prepared on the PAP-CL by a one-step spincoating method with a speed of 4000 r/min using a precursor solution of 0.33 mmol/L CsBr and 0.33 mmol/L PbBr2 dissolved in dimethyl sulfoxide (DMSO) in a N2-filled glovebox
Summary
Hyperspectral imaging (HSI), a promising technique combining spectral and spatial information, has been exploited for applications ranging from remote sensing [1] to biomedicine [2,3]. We demonstrate a novel Si − CsPbBr3 hybrid PD supporting the flat spectral responsivity in the visible regions for the first time and, further, being used in HSI systems with reflectance mode and transmission mode to realize tumor detection and tissue identification. With the use of this PAP-CL, which serves as a function of shaping the responsivity spectrum, we fabricate a Si − CsPbBr3 hybrid (device structure: Si∕PEDOT:PSS∕AgNWs∕PEDOT:PSS∕CsPbBr3) PD with a flat spectral response in the visible regions. We believe that this perovskite optimization can be integrated into modern CCD, becoming a step in future CCD fabrication processes, which is a milestone for high-performance HSI systems
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