Spectroscopic Studies of Charge Dynamics in Non-Fullerene Organic Solar Cells
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Abstract
Organic solar cells (OSCs) are a promising technology for emission-free electricity supply. However, low power conversion efficiencies and poor device stabilities have so far prevented widespread commercial applications. Remarkable progress has been made recently by the development of non-fullerene electron acceptor materials. They benefit from good tunablity of energy levels as well as greater thermal and photochemical stability, and remarkable power conversion efficiencies of up to 16.5 % have been achieved. Furthermore, they have shown efficient charge separation with negligible energy loss, overcoming one of the crucial limitations of fullerene based OSC.
Here, we present a study on the charge generation, separation, and recombination dynamics of non-fullerene solar cells. We investigate the model system P3TEA:SF-PDI
Furthermore, we study PBDB-T:ITIC, a material that was used in the first non-fullerene cell that exceeded 10 % efficiency. We find that the charge generation occurs on a