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Updated: Jan 7, 2026

Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Published on: June 23, 2018

Flexible Multiband Photonic Synapses for Nociceptive Perception and Neuromorphic Computation via Fluorinated InP

Wanlong Lu^1,2, Peixian Li¹, Bin Zeng²

¹School of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China.

Advanced Materials (Deerfield Beach, Fla.)

|December 27, 2025

Summary

Environmentally friendly indium phosphide quantum dots enable flexible organic photonic synaptic transistors. These devices mimic biological synapses, offering high performance and color selectivity for neuromorphic visual systems.

Keywords:

colloidal quantum dots environmental friendliness indium phosphide surface ligands synaptic transistors

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Area of Science:

Materials Science
Neuroscience
Optoelectronics

Background:

Organic photonic synaptic transistors (OPSTs) are key for neuromorphic visual systems, requiring multispectral responsiveness.
Current OPSTs use quantum dots (QDs) but face challenges like complex fabrication, poor flexibility, and toxicity (Cd/Pb).

Purpose of the Study:

To develop a flexible, solution-processed OPST using eco-friendly indium phosphide (InP) QDs.
To address environmental and biosafety concerns associated with traditional QD-based OPSTs.

Main Methods:

Fabrication of flexible OPSTs using solution-processed InP QDs.
Ligand exchange with fluorinated thiols to enhance QD properties.
Characterization of device performance, including synaptic behavior, mechanical durability, and color selectivity.

Main Results:

Demonstrated a fully solution-processed, self-supporting flexible OPST based on InP QDs.
Achieved improved photostability, energy level alignment, and long-term charge retention via ligand exchange.
Exhibited broadband excitatory postsynaptic current (EPSC) responses, tunable plasticity, and ultralow energy consumption (0.016 fJ).
Showcased color selectivity for blue-feature recognition and suppression of red-green noise, mimicking cornea-like nociceptor behavior.

Conclusions:

Developed high-performance, eco-friendly, and flexible photonic synapse devices using InP QDs.
The study offers a viable strategy for advanced neuromorphic computing and visual perception applications.
Highlighted the potential of InP QDs in creating safer and more sustainable brain-inspired electronic systems.