Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: Hybrid and Perovskite Photovoltaics

CPP 11.20: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Crystalline Structure and Stability Studies of Differently Processed Hybrid Perovskite Films -Towards Stability under Ambient Conditions — •Tanaji Gujar and Mukundan Thelakkat — Applied Functional Polymers, Department of Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany

Organic-inorganic halide perovskite-based thin film solar cells show excellent PCE. However, high PCE values have often been reached with poor air-stability. The degradation of its performance in moisture has attracted great attention, but the specific mechanism is not yet fully established. In this work, we used three different processing methods for the perovskite films preparation under N2 atmosphere and observed that the processing methods have a strong influence on the film structural properties and stability in ambient condition. Intensive characterizations including SEM, XRD and UV-Visible with aging of perovskite films in ambient conditions are carried out for understanding the structural and morphological relation with stability. Here we show that the films prepared by MAI-Vapor assisted method have compact, dense and pore-free with stability more than one month in ambient conditions. This also indicates that the formation of film morphology and structure could prevent water infiltration into the perovskite and increase the stability, thus enabling possibilities toward perovskite solar cells with long device lifetimes and a resistance to humidity. A comparison of the materials for their solar cell performance is also carried out. This work suggests important pathway to understand the degradation of the perovskite structure under normal humidity condition.