Abstract

In article no. 1800132, Jin-Peng Yang, Nobuo Ueno, Satoshi Kera, and co-workers perform observations of the top valence band structure of CH3NH3PbI3 single crystals using angle-resolved ultraviolet photoelectron spectroscopy of the cleaved single-crystal surfaces. The combination of freshly cleaved crystal surfaces and determination of the exact orientation of the crystal axes using diffraction techniques successfully measures well-determined crystal directions.

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