The exploitation of natural materials has received growing attention becauseof the needs of environmental sustainability. In contrast to petroleum-basedsynthetic materials, natural materials possess significant advantages of abundant,low-cost, degradable, and renewable. Here, the recent research status ofnatural materials as flexible substrate, cathode interfacial material, and anodeinterfacial material for organic photovoltaics (OPVs) are first presented. Then,the confronted key challenges that limit the widespread application of naturalmaterials for OPVs is summarized, including complex multilength scaledaggregation morphology, non-conjugated structure, and unclear workingmechanism. Finally, their potential solutions from the perspective of chemicalstructure are proposed for constructing efficient OPVs. It is believed thatnatural materials have a broad landscape in low-cost and green manufacturingtechnology for OPVs in the future.
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