Black Phosphorus Quantum Dots Based Heterostucture Boosting Electron Extraction for Non-Fullerene Organic Solar Cells Surpassing 15% Power Conversion Efficiency

In this study, we develop black phosphorus quantum dots (BPQDs) combined with PFN-Br to construct a heterostucture (PFN-Br/BPQDs) as efficient interlayer for high-performance non-fullerene organic solar cells (OSCs). By rational interface formation, the synergia of the PFN-Br/BPQDs heterointerface is fully utilized, which not only decreases the interface roughness of PFN-Br but also coordinates the electronic structures of each ingredient to provide the additional built-in field and more pathway for electron transportation, leading to the increase of electron extraction efficiency and reduction of recombination losses. As a result, the first successful properly designed PFN-Br/BPQDs heterostructure for non-fullerene OSCs achieves a PCE of 15.03% (maximum of 15.20%), which offers an inspiring route for high performance non-fullerene OSCs.