Vertically stacked monolithic perovskite colour photodetectors

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Modern color image sensors are limited by passive optical filters that reduce light utilization efficiency.
• Existing active optical filtering methods, like Foveon-type architectures, lack precise color selectivity.
• There is a need for advanced sensor designs to improve sensitivity and image quality.

Purpose of the Study:

• To develop an innovative color sensor array architecture overcoming limitations of current technologies.
• To leverage perovskite properties for efficient and accurate color imaging.
• To enhance light utilization and color fidelity in image sensors.

Main Methods:

• Utilized multilayer monolithically stacked lead halide perovskite thin-film photodetectors.
• Exploited perovskite bandgap tunability to selectively absorb red, green, and blue light.
• Eliminated the need for passive optical color filters.

Main Results:

• Demonstrated external quantum efficiencies of 50% (red), 47% (green), and 53% (blue).
• Achieved a color accuracy of 3.8% in ΔE_Lab.
• Outperformed state-of-the-art color-filter array and Foveon-type photosensors.

Conclusions:

• The novel perovskite architecture significantly improves light utilization in color sensors.
• This design paves the way for next-generation image sensors with enhanced sensitivity and color fidelity.
• The developed sensor offers a promising solution for artefact-free, high-quality color imaging.