Lee, Hanna Hwang, Jun Ho Song, Seung Ho Han, Hyemi Han, Seo-Jung Suh, Bong Lim Hur, Kahyun Kyhm, Jihoon Ahn, Jongtae Cho, Jeong Ho Hwang, Do Kyung Lee, Eunji Choi, Changsoon Lim, Jung Ah 2024-01-19T09:00:29Z 2024-01-19T09:00:29Z 2023-08-17 2023-09 2198-3844 https://pubs.kist.re.kr/handle/201004/113347 High-performance chiroptical synaptic phototransistors are successfully demonstrated using heterojunctions composed of a self-assembled nanohelix of a & pi;-conjugated molecule and a metal oxide semiconductor. To impart strong chiroptical activity to the device, a diketopyrrolopyrrole-based & pi;-conjugated molecule decorated with chiral glutamic acid is newly synthesized; this molecule is capable of supramolecular self-assembly through noncovalent intermolecular interactions. In particular, nanohelix formed by intertwinded fibers with strong and stable chiroptical activity in a solid-film state are obtained through hydrogen-bonding-driven, gelation-assisted self-assembly. Phototransistors based on interfacial charge transfer at the heterojunction from the chiroptical nanohelix to the metal oxide semiconductor show excellent chiroptical detection with a high photocurrent dissymmetry factor of 1.97 and a high photoresponsivity of 218 A W-1. The chiroptical phototransistor demonstrates photonic synapse-like, time-dependent photocurrent generation, along with persistent photoconductivity, which is attributed to the interfacial charge trapping. Through the advantage of synaptic functionality, a trained convolutional neural network successfully recognizes noise-reduced circularly polarized images of handwritten alphabetic characters with better than 89.7% accuracy. English Wiley-VCH Verlag Chiroptical Synaptic Heterojunction Phototransistors Based on Self-Assembled Nanohelix of π-Conjugated Molecules for Direct Noise-Reduced Detection of Circularly Polarized Light Article 10.1002/advs.202304039 1 Advanced Science, v.10, no.27 Advanced Science 10 27 Y scie scopus 001037285000001 2-s2.0-85165909046 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article CHARGE-TRANSFER PERFORMANCE TRANSISTORS CELLS chiral-optoelectronics circularly polarized light nanohelix self-assembly of conjugated molecule synaptic photodetector