Polyimide Interfacial Layers for Organic Solar Cells with Polymer:Nonfullerene Bulk Heterojunction Layers
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Organic solar cells based on conjugated polymers have been extensively studied for the last two decades and their power conversion efficiencies have been gradually improved up to ca. 18%. Both synthesis of new organic materials and invention of new device structures can be mainly accountable for such improvement in organic solar cells. Of various innovative approaches in terms of device architectures, interfacial layers have attracted keen attention because they could enhance the efficiency of organic solar cells with the same active layers in the absence of introducing new organic materials. Our group tried to invent various types of interfacial layers for organic solar cells and reported their obvious effects in enhancing the power conversion efficiencies. This presentation reports three types of polyimide-based interfacial layers, which have been designed for achieving good thermal and mechanical stabilities, for high efficiency organic solar cells with bulk heterojunction layers.