The methoxymethyl chain imparts BDTT with excellent optical properties, strong intermolecular interactions and tight π–π stacking, making it a potential component for the design of electron-donating organic semiconductors.
Compared to the complexes using N and O as coordination atoms, whose PCE has never exceeded 10%, the sensitizers using the softer S as a coordination atom have made a breakthrough in their performance, with a PCE of 10.96%.
This study demonstrates that the combination of wide bandgap random copolymers and PC71BM is an ideal pair for cost-effective, efficient indoor organic photovoltaics.
This structural characterisation shows how non-fullerene acceptor packing largely track from single crystals to solar cells. The crystal packing impacts electron mobility, while the domain purity drives the bimolecular recombination and performance.
In this review, the development of small molecular donors and acceptors with variable alkyl chains and their impact on molecular packing, exciton generation and dissociation, and solar cell performance is discussed.