Flexible Microspectrometers Based on Printed Perovskite Pixels with Graded Bandgaps

Area of Science:

• Materials Science
• Optoelectronics
• Spectroscopy

Background:

• Miniaturized spectrometers are crucial for spectral analysis but face challenges in large-scale production and consistent performance.
• Perovskite materials offer potential for advanced photodetector applications due to their tunable properties.

Purpose of the Study:

• To develop a miniaturized spectrometer with improved large-scale fabricability and performance repeatability.
• To demonstrate a flexible microspectrometer using inkjet-printed perovskite photodetectors with graded bandgaps.

Main Methods:

• Optimized inkjet printing of high-quality perovskite films with controlled bandgaps.
• Fabrication of pixelized graded-bandgap perovskite photodetector arrays.
• Algorithmic reconstruction of spectral data from photodetector output currents.
• Evaluation of spectral reconstruction accuracy and resolution against commercial spectrometers.

Main Results:

• Achieved high-quality perovskite films with minimal defects and large grains.
• Demonstrated perovskite photodetectors with distinct spectral responsivities and cutoff wavelengths.
• Successfully constructed microspectrometers capable of reliable spectral reconstruction with ~10 nm resolution.
• Fabricated flexible microspectrometers on polymer substrates exhibiting excellent mechanical flexibility.

Conclusions:

• Inkjet printing enables scalable and repeatable fabrication of perovskite-based microspectrometers.
• The developed flexible miniaturized spectrometers offer reliable performance and broad applicability.
• This technology is promising for wearable sensors, hyperspectral imaging, and Internet of Things devices.