Ethynyl-linked perylene bisimide based electron acceptors for non-fullerene organic solar cells

In this work, star-shaped perylene bisimide (PBI) derivatives with spiro-aromatic cores linked with ethynyl units were developed as electron acceptors for non-fullerene organic solar cells. The ethynyl linkers were found to enhance the planarity of the conjugated backbone, resulting in high electron mobilities and near-infrared absorption. The ethynyl-linked PBI acceptors showed high power conversion efficiencies (PCEs) up to 4.27% due to the...