Non-fullerene acceptors are a type of organic semiconductor material that is used in organic photovoltaic (OPV) devices as an alternative to fullerene acceptors. Non-fullerene acceptors have shown promise in improving the efficiency and stability of OPV devices due to their tunable energy levels, high electron mobility, and good absorption properties. Research in this area focuses on developing new non-fullerene acceptor materials, optimizing device architectures, and understanding the mechanisms of charge generation and transport in OPV devices using non-fullerene acceptors. This research has the potential to advance the field of organic photovoltaics and contribute to the development of more efficient and sustainable solar energy technologies.