Ionic liquid enables high-performance, self-powered CsPbBr₃ perovskite nanonet photodetector

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Perovskite materials offer unique optoelectronic properties for device applications.
• Self-powered photodetectors (PDs) are crucial for energy-efficient sensing technologies.
• Controlling interfacial properties is key to optimizing perovskite device performance.

Purpose of the Study:

• To fabricate high-quality cesium lead bromide (CsPbBr3) perovskite nanonet films.
• To construct and optimize self-powered photodetectors (PDs) using these films.
• To investigate the effect of ionic liquid passivation on PD performance.

Main Methods:

• Fabrication of CsPbBr3 perovskite nanonet films using polystyrene spheres.
• Construction of self-powered PDs with an ITO/SnO2/CsPbBr3/carbon structure.
• Passivation of the nanonet films with varying concentrations of 1-butyl-3-methylimidazolium bromide (BMIMBr) ionic liquid.

Main Results:

• The dark current of the PDs showed a minimum at an optimal BMIMBr concentration, while photocurrent remained stable.
• The optimized PD achieved a high switch ratio of 1.35 × 10^6.
• Excellent performance metrics were recorded: 140 dB linear dynamic range, 0.19 A W^-1 responsivity, and 4.31 × 10^12 Jones detectivity.

Conclusions:

• Ionic liquid passivation is an effective strategy for enhancing the performance of perovskite photodetectors.
• The developed CsPbBr3 perovskite nanonet PDs demonstrate potential for high-performance, self-powered sensing applications.
• These findings offer valuable insights for the rational design of perovskite-based optoelectronic devices.