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Wide‐bandgap perovskites are promising absorbers for state‐of‐the‐art tandem solar cells to feasibly surpass Shockley–Queisser limit with low cost. However, the commonly used mixed halide perovskites suffer from poor stability; particularly, photoinduced phase segregation. Electrospray deposition is developed to bridge the gap of growth rate between iodide and bromide components during film growth...