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Due to the unique advantages of light weight, flexibility, stretchability and biocompatibility, organic solar cells have great commercial application prospects in the fields of wearable and portable electronics. Based on miscibility and crystallinity considerations, Long Ye and co-workers proposed an effective strategy to simultaneously improve device efficiency, mechanical robustness, and stability of all-polymer organic solar cells by refining the aggregation and crystallization behaviors of polymerized Y-series acceptors. This work heralds a bright future of all-polymer systems for flexible wearable energy-harvesting applications. More details are discussed in the article by Ye et al. on page 159—166.