A Polarization-Sensitive Photodetector with Patterned CH₃NH₃PbCl₃ Film

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Perovskite photodetectors are crucial for imaging and remote sensing.
• Most research focuses on iodine or bromine perovskites, limiting chloride-based applications.
• Chloride perovskites offer wider bandgaps but are less explored.

Purpose of the Study:

• To develop high-performance, polarization-sensitive photodetectors using chloride-based perovskites.
• To explore the potential of patterned spatially confined methods for fabricating these devices.
• To investigate the optoelectronic properties and polarization sensitivity of the fabricated devices.

Main Methods:

• Fabrication of patterned perovskite photodetectors (PP-PDs) using a spatially confined method.
• Characterization of photoelectric conversion performance, including on/off ratio, dark current, and response time.
• Evaluation of polarization sensitivity and responsivity/detectivity.
• Demonstration of polarization layered imaging sensing via stepwise scanning.

Main Results:

• The PP-PDs exhibit outstanding photoelectric conversion performance and polarization sensitivity.
• Achieved an on/off ratio of 3.4 × 10^4, dark current of 1.56 × 10^-11 A, and microsecond response time.
• High responsivity (10.6 A/W) and detectivity (3 × 10^12 Jones) were recorded.
• Successful demonstration of polarization layered imaging sensing.

Conclusions:

• The developed PP-PDs represent some of the highest-performing MAPbCl3-based photodetectors reported.
• This work offers innovative strategies for creating high-performance polarized perovskite photodetectors.
• The findings open new avenues for advanced polarization-sensitive imaging and sensing technologies.