Non-fullerene acceptors are a type of organic molecule used in organic photovoltaic devices as an alternative to fullerene acceptors. These acceptors are typically small molecules or polymers that can be tailored to have specific electronic properties, making them promising candidates for improving the efficiency and stability of organic solar cells. Non-fullerene acceptors are being actively researched to address the limitations of fullerene acceptors, such as poor electron transport and stability, and to enhance the overall performance of organic photovoltaic devices. By optimizing the molecular structure and properties of non-fullerene acceptors, researchers aim to improve the power conversion efficiency and reduce the cost of organic solar cells.