Journal
ADVANCED MATERIALS
Volume 28, Issue 3, Pages 553-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201503406
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The electronic structure of a large sample set of CH3NH3PbI3-based per-ovskites 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 with-out introducing significant amounts of gap states.
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