Impact of core structure on the absorption wavelength and efficiency of non-fullerene acceptors for organic solar cells

The invention of non-fullerene acceptors has made it possible for organic solar cells to quickly improve their power conversion efficiencies to over 19%. This gives organic solar cells more promising for use in real-world applications. Molecular engineering-based tunability of the absorbance spectra, appropriate molecular orbital energy levels, energy gaps, high electron affinities, and solubility are non-fullerene acceptors’ key advantages. The electron-rich central units play an important role in enhancing the absorption spectra and the overall performance of non-fullerene acceptors. These findings show how the electron-rich/poor structure affects the non-fullerene acceptors’ photophysical and optoelectronic capabilities.