Extended Data Fig. 8: XPS spectra of strained α-FAPbI3.
From: Strain engineering and epitaxial stabilization of halide perovskites
XPS spectra of: a, I 3d; b, Pb 4f; c, Br 4p; and d, Cl 2p photoelectrons from a strained α-FAPbI3 film. Results show that Br and Cl are absent in the strained α-FAPbI3.
