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Morphology optimization is critical for achieving high efficiency and stable bulk‐heterojunction (BHJ) organic solar cells (OSCs). Herein, the use of 3,5‐dichlorobromobenzene (DCBB) with high volatility and low cost to manipulate evolution of the BHJ morphology and improve the operability and photostability of OSCs is proposed. Systematic simulations reveal the charge distribution of DCBB and its...