Perovskite image sensor triples light capture, sharpens resolution

Researchers at ETH Zurich and Empa in Switzerland have developed a novel perovskite-based image sensor that significantly outperforms traditional silicon sensors in light sensitivity, resolution, and color accuracy. Unlike conventional sensors that rely on color filters—resulting in substantial light loss by capturing only about one-third of incoming photons per pixel—the new sensor uses stacked layers of lead halide perovskite crystals. Each layer is chemically tuned to absorb a specific wavelength (red, green, or blue) without filters, enabling each pixel to capture the full spectrum of light. This design allows the sensor to capture up to three times more light and achieve three times greater spatial resolution than current silicon-based sensors. The perovskite sensor’s tunability comes from adjusting the chemical composition of the crystals, specifically the ratios of iodine, bromine, and chlorine ions, to target different colors. This approach not only enhances image clarity and color precision but also reduces digital artifacts. The researchers have successfully miniaturized the technology