Axially Chiral Semiconducting Polymers Enabling NIR Circularly Polarized Light‐Sensing Phototransistors and Neuromorphic Synapses
Abstract
ABSTRACT Waveplate‐free detection of near‐infrared (NIR) circularly polarized light (CPL) has been limited by the absence of materials that simultaneously exhibit strong NIR circular dichroism and efficient charge transport. Here, we present a family of axially chiral conjugated polymers, S ‐ and R ‐pDPP4TBN‐X , designed by grafting S/R ‐6,6′‐dimethoxy‐1,1′‐binaphthyl ( S/R ‐MeBN) onto a diketopyrrolopyrrole (DPP)‐bithiophene backbone. By tuning the MeBN: DPP ratio, the polymers exhibit extended absorption up to ∼1000 nm, enhanced circular dichroism in the 500–870 nm region, and optimized thin‐film morphology for charge mobility. Organic phototransistors based on S/R ‐pDPP4TBN‐10 achieve hole mobilities up to 0.13 cm 2 V −1 s −1 , responsivities as high as 12.52 A W −1 , detectivities on the order of 10 11 Jones, and dissymmetry factors ( g Iph ) of 0.30 and ‐0.34 under 808 nm CPL, enabling unambiguous discrimination of left‐ and right‐handed light. Beyond static sensing, these devices emulate synaptic plasticity under CPL stimulation and, when coupled with an artificial neural network, deliver classification accuracies exceeding 95%. This work establishes a modular design paradigm for compact, NIR‐active CPL sensors that integrate high charge transport, pronounced chiroptical response, and neuromorphic function, paving the way for photonic encryption, wearable optoelectronics, and bioinspired computing platforms.
Article Details
Authors (14)
Peng Ren
Wei Feng
Materdicine Lab, School of Life Sciences
Zhaoyang Qin
School of Materials & Energy, Lanzhou University 1 , Lanzhou 730000,
Tianqiang Cui
State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering
Xingyun Zhang
Nan Luo
Bolun Huang
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering
Qi Wang
Hua Geng
Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 P.R. China
Chengshan Yuan
State Key Laboratory of Natural Product Chemistry, Key Laboratory of Special Function Materials and Structure Design College of Chemistry and Chemical Engineering Lanzhou China
Xiangfeng Shao
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering
Lang Jiang
Beijing National Laboratory for Molecular Sciences, CAS Center of Excellence in Molecular Science
Hao‐Li Zhang
State Key Laboratory of Natural Product Chemistry Key Laboratory of Special Function Materials and Structure Design (MOE) College of Chemistry and Chemical Engineering Lanzhou University Lanzhou P.R. China
Zitong Liu
State Key Laboratory of Natural Product Chemistry, Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering