Recent advances in morphology optimizations towards highly efficient ternary organic solar cells

Abstract

Organic solar cells (OSCs) have attracted considerable attention and have witnessed rapid progress in the aspects of materials design, device engineering and device physics. Ternary blend organic solar cells (TB‐OSCs), which incorporate more than two chromophores into the active blend, combine the merits of both single‐junction and tandem systems, leading to impressive device performances. However, the introduction of third component into the active blend makes the resulting morphology more complicated than the traditional binary blend. Revealing the morphology evolution and the underlying working mechanism are of great importance to guide the smart design of highly efficient TB‐OSCs. This review introduces the recent different methods that predict the miscibility, a key factor which plays an important role in morphology evolution of OSCs, and classifies the miscibility induces various morphology types of TB‐OSCs. Then, this review summarizes the recent advances in TB‐OSCs that following the above morphology types to provide an insight into the “miscibility‐morphology‐performance” relationship. Finally, challenges and perspectives toward the future development of TB‐OSCs have been presented.