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Polymer solar cells (PSCs) with a bulk heterojunction (BHJ) device structure have incredible advantages, such as low‐cost fabrication and flexibility. However, the power conversion efficiency (PCE) of BHJ PSCs needs to be further improved to realize their practical applications. In this study, boosted PCEs from PSCs based on BHJ composites incorporated with Fe3O4 magnetic nanoparticles (MNPs), aligned...