Valence band dispersion measurements of perovskite single crystals using angle-resolved photoemission spectroscopy

The electronic structure of a cleaved perovskite (CH3NH3PbBr3) single crystal was studied in an ultrahigh vacuum (UHV) system using angle-resolved photoemission spectroscopy (ARPES) and inverse photoelectron spectroscopy (IPES). Highly reproducible dispersive features of the valence bands were observed with symmetry about the Brillouin zone center and boundaries. The largest dispersion width was found to be similar to 0.73 eV and similar to 0.98 eV along the Gamma X and Gamma M directions, respectively. The effective mass of the holes was estimated to be similar to 0.59m(0). The quality of the surface was verified using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The elemental composition was investigated using high resolution X-ray photoelectron spectroscopy (XPS). The experimental electronic structure shows a good agreement with the theoretical calculation.