1. Impact of Film Stoichiometry on the Ionization Energy and Electronic Structure of CH3NH3PbI3Perovskites
- Author
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Selina Olthof, Jennifer Emara, Tobias Schnier, Thomas Riedl, Neda Pourdavoud, and Klaus Meerholz
- Subjects
Diffraction ,Materials science ,Mechanical Engineering ,Analytical chemistry ,02 engineering and technology ,Electronic structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,X-ray photoelectron spectroscopy ,Mechanics of Materials ,Chemical physics ,X-ray crystallography ,Density of states ,General Materials Science ,Ionization energy ,0210 nano-technology ,Stoichiometry ,Perovskite (structure) - Abstract
The electronic structure of a large sample set of CH3 NH3 PbI3 -based perovskites is studied. Combined investigations by UV/X-ray photoelectron spectroscopy and X-ray diffraction reveal that interstitials present in the film lead to changes in the occupied density of states close to the valence band, which in turn influences the performance of solar cells. Changes in elemental composition tune the ionization energy of the perovskite film by almost 1 eV without introducing significant amounts of gap states.
- Published
- 2015
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