Ultra-Sensitive Optoelectronics Enabled by Atomically Tailored Interfaces Engineering for Advanced Perceptual Imaging

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Ultra-weak light detection is crucial for advanced imaging, remote monitoring, and autonomous systems.
• Efficient charge transfer is key to achieving ultralow detection thresholds in photodetectors.

Purpose of the Study:

• To develop an interfacial lattice-distortion engineering strategy for enhancing charge transfer in 2D perovskites.
• To create a high-performance photodetector for ultrasensitive, low-noise applications.

Main Methods:

• Selective substitution of phenylethyl ammonium (PEA) cations with 4-chlorophenylethylammonium (Cl-PEA) at perovskite heterointerfaces.
• Integration of engineered perovskites with MoS2/WSe2 heterostructures for van der Waals contact.
• Characterization of photodetection performance, including responsivity, detectivity, and noise equivalent power.

Main Results:

• Achieved a 26% boost in hole transport efficiency in few-layer 2D perovskites via lattice distortion.
• Demonstrated a high-performance photodetector with responsivity of 2.7 × 10^4 A/W and detectivity up to 5.26 × 10^14 Jones.
• Device operates self-powered at low incident power densities (0.54 µW cm^-2) and enables on-chip image processing for AI.

Conclusions:

• Interfacial lattice distortion engineering is a viable strategy for improving charge transport in 2D perovskite-based optoelectronics.
• The developed photodetector shows potential for ultrasensitive, low-noise imaging and integrated machine learning applications.
• This approach opens new avenues for designing next-generation, functionally integrated optoelectronic devices.