Ternary blend organic solar cells with a non-fullerene acceptor as a third component to improve η
Published at Organic Electronics [Elsevier]
The high performance ternary OSCs were achieved by incorporating non-fullerene acceptor IDFBR.
The Urbach energy and energetic disorder of binary and ternary blends were characterized by PDS measurements.
Synergistic improvement of all three photovoltaic properties Jsc, Voc and FF was observed.
Ternary blends, where an additional component is added to a donor/acceptor blend, represent a promising route to improve upon the performance of organic solar cells. Non-fullerene acceptor materials are particularly suited for this application due to their relatively stronger absorption coefficients and tuneable molecular energy levels. This paper demonstrates a ternary blend solar cell by incorporating a promising non-fullerene acceptor, IDFBR, into a PffBT4T-2OD:PC71BM blend. The addition of IDFBR to this blend leads to the formation of a cascading energy band structure in the device, which is required for the operation of an efficient ternary system. Ternary blend solar cells with an IDFBR concentration of 5 wt% demonstrated improved photovoltaic performance, when compared to the host binary blends. This improved performance was attributed to a reduction in energetic disorder and improved charge carrier transport in the ternary blend.