Publication date: 28th August 2024
Modern color image sensors and cameras face challenges in improving sensitivity and color fidelity due to the inherent inefficiencies in light utilization. A major factor contributing to these inefficiencies is the use of passive optical filters, which absorb a significant portion of incoming light, thereby diminishing the sensors' quantum efficiency. We present an innovative architecture for color detector arrays, leveraging multilayer monolithically stacked lead halide perovskite thin-film photodetectors. By utilizing the tunable bandgap of perovskites, we selectively absorb the red, green, and blue regions of the visible light spectrum, eliminating the need for traditional color filters. We achieved external quantum efficiencies of 50%, 47%, and 53% for the red, green, and blue channels and color accuracy of 4.5ΔELab, outperforming state-of-the-art color-filter array and Foveon-type photosensors while avoiding demosaicing artifacts. Our study lays the groundwork for the next generation of image sensors, employing conceptually novel architectures with enhanced light utilization.
The work was financially supported by ETH Zürich through the ETH+ Project SynMatLab: Laboratory for Multiscale Materials Synthesis.
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