Conjugated polymers have attracted much attention for their biomedical and (opto)electronic applications . One of the critical advantages of conjugated-polymer-based electronics is their compatibility with low-cost, high-throughput manufacturing, which allows one to produce flexible, light-weight electronics using various solution-processing techniques . The solidstate properties of conjugated polymers depend sensitively on their morphologies across all length scales, which encompasses molecular-scale intramolecular conformation and intermolecular ordering, mesoscale domain size, orientation and connectivity, and macroscale alignment and (para)crystallinity . This multiscale morphology in the solid-state is largely affected by solution-state aggregates and their assembly pathways from solution to thin films . In-depth understanding of the solution aggregation and assembly pathways will lead to precise control of many electronic and optical properties, such as charge carrier generation and transport , interfacial charge transfer , signal transduction , spin transport , optical absorption , etc -properties of close relevance to a wide range of device applications including transistors, thermoelectrics, solar cells, bioelectronics, photocatalysts, and spintronics.