Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Postersession I
DS 36.40: Poster
Mittwoch, 22. März 2017, 17:00–19:00, P2-EG
Investigation of oxygen-degraded organometallic halide perovskite via photoluminescence and photothermal deflection spectroscopies — •Alexandra Bausch1,2, Paul Fassl1,2, Qing Sun1,2, David Becker-Koch1,2, Paul E. Hopkinson1,2, and Yana Vaynzof1,2 — 1Kirchhoff-Institute for Physics, Heidelberg University, Germany — 2Centre for Advanced Materials, Heidelberg University, Germany
In recent years organo-metallic perovskite solar cells have been enthusiastically investigated due to their high power conversion efficiencies, low production costs and simple device fabrication. While the performance and electronic properties of perovskite photovoltaic devices are extensively researched, their environmental stability remains a major challenge to their potential integration into industrial application and is far less investigated. In order to develop a deeper understanding of the degradation processes taking place in perovskite solar cells when exposed to oxygen and light, we study the optical properties of degraded methylammonium lead iodide using photoluminescence and photothermal deflection spectroscopies. For this purpose, perovskite films fabricated using different methods are exposed to simulated sunlight under precisely controlled levels of oxygen in a dry environment. Longtime photoluminescence measurements reveal the effect of oxygen induced degradation on the efficiency of emission from the perovskite layers. Furthermore, photothermal deflection spectroscopy allows careful evaluation of the absorption edge of the perovskite layers, which enables the calculation of the Urbach energy.