Impact of Film Stoichiometry on the Ionization Energy and Electronic Structure of CH3NH3PbI3 Perovskites

Advanced MaterialsVolume 28, Issue 3 p. 553-559 Communication Impact of Film Stoichiometry on the Ionization Energy and Electronic Structure of CH3NH3PbI3 Perovskites Jennifer Emara, Jennifer Emara Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanySearch for more papers by this authorTobias Schnier, Tobias Schnier Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanySearch for more papers by this authorNeda Pourdavoud, Neda Pourdavoud Institute of Electronic Devices, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, GermanySearch for more papers by this authorThomas Riedl, Thomas Riedl Institute of Electronic Devices, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, GermanySearch for more papers by this authorKlaus Meerholz, Corresponding Author Klaus Meerholz Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanyE-mail: klaus.meerholz@uni-koeln.de, selina.olthof@uni-koeln.deSearch for more papers by this authorSelina Olthof, Corresponding Author Selina Olthof Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanyE-mail: klaus.meerholz@uni-koeln.de, selina.olthof@uni-koeln.deSearch for more papers by this author Jennifer Emara, Jennifer Emara Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanySearch for more papers by this authorTobias Schnier, Tobias Schnier Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanySearch for more papers by this authorNeda Pourdavoud, Neda Pourdavoud Institute of Electronic Devices, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, GermanySearch for more papers by this authorThomas Riedl, Thomas Riedl Institute of Electronic Devices, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, GermanySearch for more papers by this authorKlaus Meerholz, Corresponding Author Klaus Meerholz Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanyE-mail: klaus.meerholz@uni-koeln.de, selina.olthof@uni-koeln.deSearch for more papers by this authorSelina Olthof, Corresponding Author Selina Olthof Department of Chemistry, University of Cologne, Luxemburger Straße 116, 50939 Cologne, GermanyE-mail: klaus.meerholz@uni-koeln.de, selina.olthof@uni-koeln.deSearch for more papers by this author First published: 25 November 2015 https://doi.org/10.1002/adma.201503406Citations: 131Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Graphical Abstract The electronic structure of a large sample set of CH3NH3PbI3-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. Citing Literature Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Filename Description adma201503406-sup-0001-S1.pdf13.7 MB Supplementary Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume28, Issue3January 20, 2016Pages 553-559 RelatedInformation