A Study on UVC Photodetector Using Mixed-Cation Perovskite with High Detection Rate as Light-Absorption Layer

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Ultraviolet (UV) C light detection is crucial for various applications.
• Perovskite materials offer tunable optoelectronic properties.
• Developing efficient and stable UV-C photodetectors remains a challenge.

Purpose of the Study:

• To fabricate a mixed-cation perovskite UV-C photodetector.
• To investigate the performance of a device utilizing formamidinium iodide (FAI) post-treatment.
• To explore the potential of perovskite-based photodetectors for UV-C applications.

Main Methods:

• Fabrication of a mixed-cation perovskite photodetector using FA_xMA_1-xPbI₃ as the light-absorption layer.
• Implementation of a simple formamidinium iodide (FAI) post-treatment process.
• Utilizing SnO₂ as the electron-transport layer due to its high transmittance in the UV-C region.

Main Results:

• The fabricated photodetector achieved a response of 50.8 mA/W.
• A high detectability of 4.47 × 10¹³ Jones was recorded.
• An external quantum efficiency of 53% was demonstrated for UV-C detection.

Conclusions:

• The formamidinium iodide (FAI) post-treatment is a promising method for fabricating efficient perovskite UV-C photodetectors.
• The developed device exhibits excellent performance metrics for UV-C detection.
• This approach holds significant potential for diverse applications requiring UV-C light sensing.