Miniature spectrometer based on graded bandgap perovskite filter

Area of Science:

• Materials Science
• Spectroscopy
• Optoelectronics

Background:

• Miniature spectrometers are crucial for scientific research and industrial inspection.
• Developing compact and high-performance spectrometers remains a significant challenge.
• Perovskite materials offer tunable optical properties suitable for advanced optical devices.

Purpose of the Study:

• To fabricate graded perovskite filters with a tunable bandgap.
• To integrate these filters into a miniature spectrometer.
• To demonstrate the performance of the developed miniature spectrometer for spectrum reconstruction.

Main Methods:

• Fabrication of graded perovskite filters via a Finkelstein reaction with in-situ formed halogen ions.
• Tuning the bandgap of perovskite films from 400 to 750 nm by controlling precursor ratios.
• Integration of the perovskite filter with a deep residual network and a commercial CMOS sensor.

Main Results:

• Successful fabrication of graded perovskite filters with precisely controlled bandgaps.
• Demonstration of a miniature spectrometer capable of accurate spectrum reconstruction.
• Achieved a high peak signal-to-noise ratio (PSNR) of 40.749.
• Obtained a monochromatic spectral resolution of 1.31 nm.

Conclusions:

• Graded perovskite filters are effective for constructing high-performance miniature spectrometers.
• The developed device offers accurate spectral analysis for various applications.
• This work advances the field of miniaturized optical sensing technologies.