A Facile Approach To Fabricate High-Performance Polymer Solar Cells with an Annealing-Free and Simple Device of Three Layers

摘要

With the rapid development of polymer solar cells research, "annealing-free" and simplifying the device structure become the main problems of commercialization of polymer solar cells (PSCs). To resolve these challenges, a novel, facile approach to develop favorably vertical separation in poly(3-hexylthiophene):(6,6)-phenyl-C61 butyric acid methyl ester : 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyano-quinodimethane (P3HT:PC61BM:F4TCNQ) ternary blend through the interaction between P3HT and F4TCNQ has been demonstrated, consequently high efficient PSCs only with three layers realized. Driven by the low surface energy of F4TCNQ, a spontaneously P3HT-F4TCNQ layer was enriched on the surface of active layer. The device can escape the annealing treatment and interfacial modification due to the well-defined vertical separation and favorable work function gradient in the activelayer. As a result, without thermal annealing and additional interlayer, PSCs only with three layers based on the ternary blend obtain a PCE of up to 4.1%. It also demonstrates good adaptation for all solution processed and flexible method. This simple device structure and "annealing-free" method of efficient polymer solar cells provide an opportunity for large-scale commercial production in the near future.