title: Iodine Migration and its Effect on Hysteresis in Perovskite Solar Cells.
abstract: The migration and accumulation of iodide ions create a modulation of the respective interfacial barriers causing the hysteresis in solar cells based on methylammonium lead iodide perovskites. Iodide ions are identified as the migrating species by measuring temperature dependent current-transients and photoelectron spectroscopy. The involved changes in the built-in potential due to ion migration are directly measured by electroabsorption spectroscopy.
authors.affiliation: Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.affiliation: Experimental Physics II, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Tscheuschner
authors.affiliation: Organic Chemistry Institute, Im Neuenheimer Feld 270, Heidelberg University, 69120, Heidelberg, Germany.
authors.forename: Fabian
authors.initials: F
authors.lastname: Paulus
authors.affiliation: Kirchhof Institute for Physics, Im Neuenheimer Feld 227, Heidelberg University, 69120, Heidelberg, Germany.|Centre for Advanced Materials, Im Neuenheimer Feld 225, Heidelberg University, 69120, Heidelberg, Germany.
authors.forename: Paul E
authors.initials: PE
authors.lastname: Hopkinson
authors.affiliation: Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
authors.forename: Johannes
authors.initials: J
authors.lastname: Kießling
authors.affiliation: Experimental Physics II, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Köhler
authors.affiliation: Kirchhof Institute for Physics, Im Neuenheimer Feld 227, Heidelberg University, 69120, Heidelberg, Germany.|Centre for Advanced Materials, Im Neuenheimer Feld 225, Heidelberg University, 69120, Heidelberg, Germany.
authors.forename: Yana
authors.initials: Y
authors.lastname: Vaynzof
authors.affiliation: Macromolecular Chemistry I, University of Bayreuth, Universitätstr. 30, 95447, Bayreuth, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Huettner
keywords: hysteresis; ion migration; mehtylammonium lead Iodide; perovskite solar cells