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Properties of DJ perovskite films. a1–a3) GIWAXS patterns of BDA‐, HDA‐ and ODA‐based DJ perovskite films. b1–b3) AFM images of BDA‐, HDA‐, and ODA‐based DJ perovskite films (areal size of 3 × 3 µm). c1–c3) Temperature‐dependent PL spectra of BDA‐, HDA‐, and ODA‐DJ perovskite films. d) PL intensity and the fitting curves as a function of temperature for the DJ perovskite films.
