Synthesis of non-fullerene acceptors for highly efficient and thermally stable organic solar cells (Conference Presentation)

Although fullerene derivatives (e.g. PC61BM/PC71BM) are being widely used as electron acceptors in organic solar cells (OSCs), their obvious drawbacks, such as the high cost, poor absorption, limited energy levels tunability and morphological instability, have become the bottlenecks to hinder the further advancement of OSCs. Therefore, the exploration of non-fullerene electron acceptors is motivated in recent years, and the efficiencies of fullerene-free OSCs have been boosted over 13%. In this presentation, I will focus on the molecular design for highly efficient and thermally stable small molecule electron acceptors based on fused diketopyrrolopyrrole (DPP) and perylene diimide (PDI) building blocks. A new strategy of unfused-ring core is put forward to synthesize thenovel electron acceptors for OSC applications. The highly efficient and thermally stable non-fullerene organic solar cells over 11% have been fabricated by carefully designing the non-fullerene acceptors.