High‐Efficiency Digital Inkjet‐Printed Non‐Fullerene Polymer Blends Using Non‐Halogenated Solvents

Inkjet printing (IJP) of polymer solar cells is ideal for small-area off-grid electronics with low power consumption. However, IJP quite a complex technique compared techniques such as spin coating or doctor blading. The blends reported based on ITIC derivatives non-fullerene acceptors (NFAs) using non-halogenated solvents. results show that fluorination NFA essential to form highly stable inks in o-xylene, because has significantly insufficient solubility ITIC-4F. importance tetralin multifunctional co-solvent efficient PM6:ITIC-4F demonstrated, even at very concentrations, not only improves ink jettability and open nozzle time, but also drying behavior the blend layer, resulting homogeneous micro- nanoscale morphology. inkjet-printed maximum efficiency 10.1%. Moreover, produces significant changes microscale In particular, formation thin PM6 capping layer surface along improved phase separation crystallinity both donor acceptor greatly reduces recombination charge carriers thick blends, making photoactive films promising industrial applications.