Ternary Nonfullerene Polymer Solar Cells with a Power Conversion Efficiency of 11.6% by Inheriting the Advantages of Binary Cells

Ternary polymer solar cells (PSCs) were commonly fabricated with two donors or two acceptors; the third component has complementary absorption spectra with a host system to improve photon harvesting. In this work, a series of nonfullerene PSCs were fabricated with J71 as the donor and IT-M and/or ITIC with an almost identical band gap as acceptors. Although IT-M and ITIC have almost identical band gaps, the two optimized binary PSCs exhibit...