Heating?induced aggregation control for efficient sequential?cast organic solar cells

The aggregation and morphology within the photoactive layer is of considerable significance to boost power-conversion efficiency (PCE) organic solar cells (OSCs). Herein, heating-induced control nonfullerene acceptor BTP-eC7 during sequential casting was demonstrated. large aggregates can be significantly reduced by hot solution on D18 fibrillar layer, further eliminated heated substrate, leading stronger face-on ?–? stacking appropriate phase separation promote exciton dissociation charge transfer. maximum PCE D18/BTP-eC7 enhanced from 8.1% room temperature 15.9% solution, hot-substrate casting, therefore demonstrates that sequential-casting strategies are a promising approach in improving performance OSCs employing acceptors with limited solubility or strong crystallization ability.