Fused-ring Electron Acceptor Single Crystals with Chiral 2D Supramolecular Organization for Anisotropic Chiral Optoelectronic Devices.

Supramolecular chiral organization gives π-conjugated molecules access to fascinating specific interactions with circularly polarized light (CPL). Such a feature enables the fabrication of high-performance chiral organic electronic devices that detect or emit CPL directly. Herein, we show that chiral fused-ring electron acceptor BTP-4F single crystal-based phototransistors demonstrate distinguished CPL discrimination capability with current dissymmetry factor (g) exceeding 1.4, one of the highest values among state-of-the-art direct CPL detectors. The theoretical calculations prove that the chirality at the supramolecular level in these enantiomeric single crystals originates from chiral exciton coupling of a unique quasi-two-dimensional supramolecular organization consisting of interlaced molecules with opposite helical conformation. Impressively, such supramolecular organization produces a higher g along the preferred growth direction of the chiral single crystals in comparison to that of the short axis direction. Furthermore, the amplified, inverted, and also anisotropic current dissymmetry compared to optical dissymmetry has been studied by the finite element simulations. Therefore, we develop a unique chiral supramolecular organization that is responsible for the excellent chiroptical response and anisotropic electronic properties, which not only enables the construction of high-performance CPL detection devices but also allows a better understanding of the structure-property relationships in chiral organic optoelectronics. This article is protected by copyright. All rights reserved.