Perovskite Nanocrystal Enhanced Vertically Stacked-Photodiode Image Sensor for Wavelength Resolved UV Imaging

We introduce a novel low-power imaging system capable of multispectral ultraviolet (UV) imaging with the ability to distinguish between different UV wavelengths. This advancement is achieved by enhancing a three-layer vertically stacked photodiode (3T APS) complementary metal-oxide-semiconductor (CMOS) image sensor with specially manufactured and tuned perovskite nanocrystals (PNCs), effectively extending the sensor’s multi-channel quantum efficiency across the UVB and UVA range. Our imaging system includes all necessary peripherals and circuits. Experimental results demonstrate that the PNC-enhanced sensor can precisely differentiate 11 distinct UV wavelengths between 300 nm and 400 nm, a level of detail unachievable with the unmodified sensor. This technology offers substantial potential for industrial and clinical applications, including the in-vitro detection of multiple biomarkers with subtly different UV fluorescence emission spectra.