Reconfigurable Organic Phototransistor Array by Scalable Photolithography for Near-Infrared Image Sensing and...

Area of Science:

• Organic electronics
• Optoelectronics
• Artificial vision systems

Background:

• Organic phototransistors (OPTs) offer flexibility and solution processability for artificial vision.
• Challenges exist in fabricating large-scale OPT arrays with sensitive near-infrared (NIR) photodetection and dynamic photomemory.
• Developing dual-mode devices is crucial for advanced visual sensing and processing.

Purpose of the Study:

• To demonstrate reconfigurable NIR OPTs with dual photodetection and photomemory functions.
• To address the challenge of fabricating high-density, uniform OPT arrays for scalable applications.
• To showcase the potential of these OPTs in NIR imaging and in-sensor computing.

Main Methods:

• Designed a simple semiconductor heterojunction for reconfigurable OPTs.
• Utilized modified organic semiconductor-compatible photolithography for high-density array fabrication.
• Investigated device switching between photodetection and dynamic photomemory modes via gate bias.

Main Results:

• Achieved high responsivity (3.82 × 10³ A W⁻¹) and detectivity (7.90 × 10¹⁴ Jones) in NIR photodetection.
• Demonstrated reversible switching between photodetection and dynamic photomemory modes.
• Fabricated a high-density OPT array (6500 units cm⁻²) with excellent uniformity.

Conclusions:

• The developed OPTs provide a promising platform for dual-mode NIR artificial vision systems.
• The reconfigurable nature and integrated sensing/processing capabilities enable diverse applications.
• Scalable fabrication methods pave the way for future organic electronic applications.