A Large‐Bandgap Guest Material Enabling Improved Efficiency and Reduced Energy Loss for Ternary Polymer Solar Cells

The rational design of guest photovoltaic materials (the third components) for enhancing the power conversion efficiency (PCE) of ternary polymer solar cells (PSCs) is a challenge. In this work, a large‐bandgap material ((5 Z ,5′ Z )‐5,5′‐(((4,4,9,9‐tetrakis(4‐hexylphenyl)‐4,9‐dihydro‐ s ‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis(2,5‐difluoro‐4,1‐phenylene))bis(methanylylidene))bis(3‐ethyl‐2‐thioxothiazolidin‐4‐one, IBR‐F) is designed,...