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(a) XRD patterns of a film of drop-cast inks upon annealing under nitrogen (see SI for full characterization). (b) Intensity ratio of CsPb2Br5 and CsPbBr3 main peaks (the solid B-spline line is for easier visualization only). (c–e) HRSEM images of samples at room temperature (c) and after annealing at 200 °C (d) and 400 °C (e).
