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Extending the range of useful polymers in non-fullerene acceptor based solar cells using a ternary solvent system

The world of organic solar cells (OSC) have been taken by storm by the recent developments in non-fullerene acceptors (NFAs) with record efficiencies being published in close succession. However, not all polymers that previously performed well in fullerene based devices are suitable for use in a blend with NFAs. This seems to be especially the case for diketopyrrolopyrrole (DPP) based polymers and currently there is a lack of understanding as to why. In our research we aim to improve on solar cell performance of DPP-NFA blends and elucidate the reason behind their suboptimal performance in order to extend the range of useful polymers in high efficiency (near infra-red absorbing) NFA OSCs. Preliminary results look promising with over 50% EQE improvement using a ternary solvent system which we currently attribute to better packing in the IEICO-4F phase.