Abstract
Abstract In this work, efficient non-fullerene organic solar cells are demonstrated based on the environmentally-friendly solvent system. The blend films morphology from the non-halogenated solvent exhibits more suitable phase separation as the non-halogenated additive is employed. In addition, the additive engineering induces the preferentially oriented self-assembly for the molecules, which contributes to better exciton dissociation, enhanced carrier mobility, and balanced charge transport. All these benefits for the additive engineering achieve the power conversion efficiency of the environmentally-friendly solvent system processed non-fullerene organic solar cells up to 4.52% efficiency, which promises the non-halogenated solvent system for eco-friendly and sustainable organic solar cell technology.
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