Air-processed, ultraresponsive NIR photodetectors using 2D perovskite hybrids.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Halide perovskites are promising for optoelectronic devices like solar cells and LEDs.
• Their wide bandgaps (∼1.40 eV) limit applications in near-infrared (NIR) photodetectors.

Purpose of the Study:

• To develop a novel 2D hybrid perovskite material for enhanced NIR photodetector performance.
• To overcome the limitations of traditional halide perovskites in the NIR spectrum.

Main Methods:

• Synthesis of a novel 2D hybrid perovskite: (PDA)₂PbI₄, where PDA is 6-phenyl-3,5-hexadiynylammonium.
• Thermopolymerization of (PDA)₂PbI₄ to form (poly-PDA)PbI₄.
• Fabrication and characterization of NIR photodetectors using the poly-PDA perovskite.

Main Results:

• The (poly-PDA)PbI₄ material was incorporated into NIR photodetectors.
• Record-high responsivities up to 10⁷ A W⁻¹ were achieved at 980 nm.
• External quantum efficiencies reached (128.0 ± 3.6)% at 980 nm under a 4 V bias.

Conclusions:

• The novel 2D hybrid perovskite demonstrates exceptional performance for NIR photodetectors.
• Devices exhibit high stability and processability, fabricated and operated under ambient air conditions.
• This work expands the potential of perovskite materials for advanced optoelectronic applications.