Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.4: Poster

Wednesday, March 22, 2017, 17:00–19:00, P2-EG

Influence of 5-Ammoniumvaleric Acide Iodide on the Stability of Methylammonium Lead Halide Perovskite Films Grown on Zinc Oxide — •Georg Dewald^1,2, Martina Stumpp^1,2, Raffael Ruess^1,2, and Derck Schlettwein^1,2 — ¹Justus-Liebig-University Giessen, Institute of Applied Physics — ²Justus-Liebig-University Giessen, Laboratory for Materials Science

As an alternative to TiO₂ in perovskite photovoltaics ZnO deserves closer attention as it possesses a higher conductivity. Further, ZnO can be prepared at low temperatures via electrochemical deposition. However, preparing CH₃NH₃PbI₃ directly on top of ZnO, leads to rapid degradation. Such stability problems could be addressed by adding 5-ammoniumvaleric acide iodide (AVAI) to CH₃NH₃PbI₃. AVA ions can form hydrogen bonds between the PbI₆ octahedrons of the perovskite and, therefore, influence the resulting morphology and electrical properties. Bond formation across the perovskite/ZnO interface is expected to stabilize it by hindering the deprotonation by the basic zinc oxide surface. In this study, CH₃NH₃PbI₃ and (AVA)_x(CH₃NH₃)_1−xPbI₃ films were prepared via spin-coating on ZnO, which was electrodeposited on micro-structured gold electrode arrays on SiO₂/Si wafers. The current-voltage curves of Au/ZnO/perovskite/ZnO/Au were measured during the annealing process at 100 ^∘C by sweeping the voltage from -2 to +2 V in nitrogen atmosphere. SEM imaging was used to examine the influence of AVAI on the morphology of the perovskite films. The SEM images and I-V characteristics of films with and without 5-AVAI will be discussed.