The rising interest in polymer-based organic solar cells (OSCs) over the past decade can be easily explained by the major technological advantages they present over conventional photovoltaics (PVs). For instance, OSCs can be fabricated at a low cost through high productivity roll-to-roll processes, which enables the facile manufacturing of large-area flexible devices. Owing to the development of highly efficient conjugated polymer donors and non-fullerene acceptors, polymeric OSCs now demonstrate certified power conversion efficiencies (PCEs) over 17%. [1] However, further improvements are needed to move from laboratory research to a large diffusion of devices in society. [2] OSCs can be broadly classified into two categories: conventional and inverted architectures. Independent of the device architecture, the OSCs are built by sandwiching the photoactive materials between two electrodes. In both configurations, the addition of cathode and/or anode interlayers (AILs) plays a pivotal role in the enhancement of the device performance due to better energy level alignment and
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