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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 Dewald1,2, Martina Stumpp1,2, Raffael Ruess1,2, and Derck Schlettwein1,21Justus-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.

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