2D Semiconductor Based Flexible Photoresponsive Ring Oscillators for Artificial Vision Pixels

Area of Science:

• Biomedical Engineering
• Materials Science
• Optoelectronics

Background:

• Current artificial retinas, often silicon-based, are rigid and have limited biocompatibility.
• Vision restoration is a critical challenge in treating blindness.

Purpose of the Study:

• To develop a flexible, biocompatible artificial retina with enhanced performance.
• To explore the potential of 2D semiconductor materials for advanced prosthetics.

Main Methods:

• Fabrication of flexible photoresponsive ring oscillators (PROs) using molybdenum disulfide (MoS₂).
• Integration of PROs into an array on flexible substrates to act as vision pixels.
• Testing of device performance under natural light illumination.

Main Results:

• Arrayed PROs efficiently converted light intensity into electrical pulses.
• Devices operated at low supply voltages (< 1 V) with record-low power consumption (12.4 nW at 10 mW/cm²).
• Power consumption was approximately 500 times lower than state-of-the-art silicon devices.

Conclusions:

• Flexible MoS₂-based PROs offer a promising alternative for artificial retinas.
• The developed artificial retinas exhibit high light-to-signal conversion efficiency and ultralow power consumption.
• These devices represent a viable prosthesis for future clinical trials in vision restoration.