Recent Progress in Organic Cocrystal-Based Superlattices and Their Optoelectronic Applications

Abstract

The utilization of organic cocrystal-based superlattice materials (OCSMs) in the field of optoelectronics is experiencing significant advancements attributable to their accurate stoichiometric coefficient and distinctive supramolecular self-assembly structures. Herein, an exhaustive review on the significant development of OCSMs reported over the past few years is presented, with a primary focus on the following major aspects. First, the emerging supramolecular nanostructures of OCSMs primarily consist of hydrogen-bonded organic frameworks (HOFs) and halogen-bonded organic frameworks (XOFs), innovative cocrystal heterostructures (OHSs), and cocrystal nanomeshes (OMSs). Further, a comprehensive summary is provided on the investigation of superlattice crystals and film preparation techniques for OCSMs, which encompasses liquid-phase growth, physical-vapor-transfer methods, and solid-phase processes. The distinctive characteristics of tunable fluorescence emission and rapid stimulus response exhibited by these emerging OCSMs, as well as their applications in memristors, photothermal conversion and imaging, sensors, FETs, and spin devices, are also elucidated. The mechanisms underlying charge transfer effects, π–π interactions, hydrogen bonds, and halogen bonds are finally analyzed to provide valuable insights into material design and promising applications.