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Issue 7, 2017
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Valence band dispersion measurements of perovskite single crystals using angle-resolved photoemission spectroscopy

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Abstract

The electronic structure of a cleaved perovskite (CH3NH3PbBr3) single crystal was studied in an ultra-high 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 ∼0.73 eV and ∼0.98 eV along the ΓX and ΓM directions, respectively. The effective mass of the holes was estimated to be ∼0.59m0. 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.

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

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Publication details

The article was received on 19 Oct 2016, accepted on 11 Jan 2017 and first published on 11 Jan 2017


Article type: Paper
DOI: 10.1039/C6CP07176G
Citation: Phys. Chem. Chem. Phys., 2017,19, 5361-5365
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    Valence band dispersion measurements of perovskite single crystals using angle-resolved photoemission spectroscopy

    C. Wang, B. R. Ecker, H. Wei, J. Huang, J. Meng and Y. Gao, Phys. Chem. Chem. Phys., 2017, 19, 5361
    DOI: 10.1039/C6CP07176G

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