Extended Data Fig. 4: XRD and XPS characteristics of the perovskite films.
From: Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent
a, Original and magnified XRD patterns from CsPbBr3, MAPbBr3, mixture-1.0, and MABr + PbBr2 + CsBr mixture perovskite films. 2-theta is the diffraction angle multiplied by 2. b, c, XPS results from CsPbBr3, MAPbBr3 and mixture-1.0 perovskite films, indicating that there are CsPbBr3 and MABr phases in the mixture-1.0 film, but not in MAPbBr3.
