High-Performance and Stable Dual-Nanograting-Perovskite-Based Near-Infrared Photodetector.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite materials offer potential for photodetector applications but suffer from instability and limited absorption in the near-infrared (NIR) spectrum.
• Existing perovskite photodetectors struggle to achieve high performance and durability, hindering their widespread adoption.
• Extending the spectral response of photodetectors to the NIR range is crucial for various sensing and imaging applications.

Purpose of the Study:

• To enhance the stability and extend the spectral response of methylammonium lead bromide (MAPbBr3) perovskite materials for near-infrared (NIR) photodetector applications.
• To develop a novel photodetector architecture incorporating dual nanogratings and upconversion nanoparticles (UCNPs) for improved performance.
• To evaluate the stability and flexibility of the developed perovskite photodetector under environmental stress and mechanical testing.

Main Methods:

• Integration of dual nanogratings and NaYF4:20%Yb, 2%Er upconversion nanoparticles with MAPbBr3 perovskite films.
• Fabrication of a photodetector device utilizing the modified perovskite structure.
• Characterization of the photodetector's performance, including responsivity and detectivity at 980 nm.
• Assessment of device stability through prolonged air exposure and repeated bending cycles.

Main Results:

• A perovskite photodetector demonstrating a responsivity of 2.9 A·W⁻¹ and detectivity of 1.34×10¹¹ Jones at 980 nm was successfully developed.
• The device exhibited remarkable stability, retaining 78.6% of its performance after 4 months of air exposure.
• Significant mechanical robustness was observed, with the device maintaining 72.4% performance after 3000 bending cycles, indicating enhanced flexibility.

Conclusions:

• The combination of dual nanogratings and upconversion nanoparticles effectively enhances the stability and NIR spectral response of perovskite photodetectors.
• The developed photodetector exhibits excellent stability and flexibility, addressing key limitations of previous perovskite-based devices.
• This approach paves the way for robust and versatile perovskite photodetectors suitable for advanced NIR sensing applications.