Porphyrin-Containing Polymer as a Superior Blue Light-Absorbing Additive To Afford High- J sc Ternary Solar Cells.

Integrating an additional component featuring complementary light absorption into binary polymer solar cells is a superior tactic to ameliorate solar cell efficiency and stability. An appropriate additive not only extends absorption range, but may also facilitate charge separation and transport processes. In this work, we elucidate the effects of incorporating a porphyrin containing conjugated polymer (PPor-1), which displays absorption in 350-500 nm, into binary PTB7-Th:4TIC and PTB7-Th:ITIC blends, affording devices with an average power conversion efficiency (PCE) approaching 9%. We successfully demonstrate that PPor-1 can be incorporated as an additive to impart improved Jsc (up to 19.1 mA cm-2).