Improving the efficiency and stability of non-fullerene polymer solar cells by using N2200 as the Additive

Polymer solar cells (PSCs) based on small molecule non-fullerene acceptors typically have a range of disadvantages including unfavorable thermal stability and charge carrier transportation. Here, we developed a high-performance non-fullerene ternary PSCs by incorporating a narrow-bandgap polymer acceptor N2200 into a binary blend film comprising of a wide-bandgap conjugated polymer PTzBI-2FP and a small-molecule non-fullerene acceptor ITIC-4F. The resulting ternary devices exhibit an outstanding power conversion efficiency of 13.0%, which is attributable to the efficient energy transfer, enhanced charge carrier mobility, and improved morphology. These findings indicate that the selection of an appropriate third polymer component that affords improved photovoltaic performance and thermal stability, representing a facile and promising route to enhance the performance and stability of PSCs.