Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Poster: Hybrid and Perovskite Photovoltaics
CPP 11.22: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Ion Migration in Perovskite based Solar Cells — •Cheng Li1, Yu Zhong1, Anna Gräser1, Richard Hildner2, and Sven Hüttner1 — 1Organic and Hybrid Electronics, Makromol. Chemie I, Universität Bayreuth — 2Experimentalphysik IV, Universität Bayreuth
Solution processed Inorganic-organic halide organometal perovskite solar cells (e.g. CH3NH3PbI3−xClx and CH3NH3PbI3) have demonstrated remarkable efficiencies recently. However, there is still a large space toward the theoretical limitation - the Shockley-Queisser Limit ( 33%). Hence, more and more interests are concentrated on factors which hinder the approach towards the limit. We employ different methods to especially address the issue of ion migration in perovskite based solar cells: electroabsorption (EA) spectroscopy explores the built-in potential in the working photovoltaic devices and temperature dependent dynamic processes are characterized by their current-voltage behavior in different temperatures. Furthermore, photoluminescence (PL) characterization, especially fluorescence microscopy (FM), is a powerful tool to investigate the trap states, excited states, charge carrier dynamics and etc., within the individual crystalline grains. We find that the PL blinking behavior in the whole film under the increasing intensity background. In addition, we also observe the process of PL decay during light illumination. We propose that this PL decay is associated with the migration of ions, especially the iodide ions, which are driven by the local electrical field induced by the light illumination.