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Chiropto-Neuromorphic Devices Based on a Photocatalytic Dye/Polymer Semiconductor Bulk Heterojunction for Circularly Polarized Light Detection and Memorization.

Y. Won,Boesung Kwon,P. Chidchob,Jeongwoo Lee,Seoyoung Kim,Joon Hak Oh

Published 2026 in Advances in Materials

ABSTRACT

Neuromorphic computing, which emulates the energy-efficient processing of the human brain, has emerged as a key technology for next-generation artificial intelligence. Integrating sensitivity to circularly polarized light (CPL) provides an additional degree of freedom for optical data encoding, yet practical implementation remains limited by material instability and complex, non-scalable fabrication. This work introduces a chiropto-neuromorphic device that addresses these challenges through a polarized light-induced charge transfer doping mechanism. The system employs a solution-processed bulk heterojunction (BHJ) composed of a chiral boron dipyrromethene (BODIPY) dye and a polymer semiconductor (PBTTT-C12) to translate CPL handedness into a stable nonvolatile memory state. Chirality-dependent charge transfer modulates the polymer's doping level, enabling precise control of synaptic weight. The device emulates key biological synaptic functions, including short- and long-term plasticity, paired-pulse facilitation, and stimulus-dependent plasticity governed by light number, duration, and intensity, while maintaining distinct chiroptical selectivity. Notably, its energy consumption remains at the picojoule (pJ) level per synaptic event, comparable to biological synapses. By introducing chirality as a new control dimension for synaptic modulation, this study demonstrates a scalable and powerful platform for polarization-encoded neuromorphic information processing and establishes a foundation for advanced artificial sensory systems capable of handling complex chiral optical signals.

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