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Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy: Variation with Photon Energy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.ORCID iD: 0000-0003-2412-8503
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455Article in journal, Editorial material (Refereed) Accepted
Abstract [en]

A better understanding of the electronic structure of perovskite materials used in photovoltaic devices is essential for their development and optimization. In this investigation, synchrotron based photoelectron spectroscopy (PES) was used to experimentally delineate the character and energy position of the valence band structures of a mixed perovskite. The valence band was measured using PES with photon energies ranging from UPS (21.2 eV) to hard X-rays (up to 4,000 eV) and by taking the variation of the photoionization cross-sections into account, we could experimentally determine the inorganic and organic contributions. The experiments were compared to theoretical calculations to further distinguish the role of the different anions in the electronic structure. The investigation also includes a thorough study of the valence band maximum (VBM) and its position in relation to the Fermi level, which is crucial for the design and optimization of complete solar cells and their functional properties.

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American Chemical Society (ACS), 2017.
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Physical Chemistry
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URN: urn:nbn:se:uu:diva-333552DOI: 10.1021/acs.jpcc.7b08948OAI: oai:DiVA.org:uu-333552DiVA: diva2:1156979
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14

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