Abstract
Summary Organic photovoltaics (OPVs) have attracted considerable attention in recent years. Most reported strategies are from the perspective of the active layers to control the morphology of the donor/acceptor blend, with few methods focusing on modifying the transporting layers. Here, we develop a facile method to enhance both the thermal stability and efficiency of OPVs simultaneously from the perspective of the electron-transporting layer (ETL). Compared with traditional planar ETLs used in OPVs, our mesoporous ETL is designed to serve as a rigid scaffold to inhibit polymer diffusion upon heating. Furthermore, this structure creates more surface-area contact between the active layer and the ETL, potentially enhancing charge-extraction efficiency. As a result, the power-conversion efficiency (PCE) with this structure was enhanced by 11% relative to the planar structure. After being subjected to thermal stability test, the PCE of the mesoporous structure retained 69% of its original value.
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