Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)
Publication date: 14th December 2015
The impressively fast technological progress of highly efficient perovskite solar cells has made a huge impact on the photovoltaic research community. Nevertheless, understanding the fundamental physical mechanisms as well as solving stability concerns of the perovskite films and solar cell devices are open points to be addressed and call for advanced characterization methods. In this work, spin-coated absorber-grade perovskite thin films and single crystals based on the most commonly used methylammonium (MA) lead iodide (MAPbI3) and bromide (MAPbBr3) are characterized with multi-wavelength excitation and high-resolution Raman and photoluminescence (PL) spectroscopy. A methodology to obtain meaningful Raman spectra without film degradation is developed for near resonant excitation conditions at a laser wavelength of 633 nm. A fast photo-induced thermal degradation can be observed and monitored for excessive laser intensities, especially for the commonly used 532 nm laser excitation. The potential of the presented methodology to study degradation mechanisms in solar cell devices will be discussed.
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